DGCA & EASA Module 5 : Digital techniques & Electronic Instrument Systems Questions
DGCA & EASA Module 5 : Digital techniques & Electronic Instrument Systems Questions-Answers
How is ARINC 429 bi-directional data transfer achieved?
a) Via a twisted pair of shielded cables
Ans b) Using two data buses
c)Via a current mode coupler
*
A basic computer would consist of
a)register section, ALU and timing and control section
Ans b) memory, input/output ports and CPU
c) RAM/ROM and input/output ports
*
A B S
0 0 0
0 1 1
1 0 1
1 1 0
This is the truth table for a
Ans a) E-OR
b) NOT
c)NAND
*
Where is the rising runway?
Ans a) EADI
b) EFIS
c)CRTs in the passenger cabin
What is ILS marker frequency?
Ans a) 75 Mhz
b) 100 Mhz
c) 125 Mhz
*
On an external power socket the two short pins are
a) for the AC interlock circuit
Ans b) to prevent arcing when inserting and extracting the socket
c) used to act as a guide
*
Flat plate antenna is
Ans a) series of waveguides with slots
b) a parabolic antenna
c) used to transmit RF signals only
*
Relationship of CMCs to BITE systems is best described as
a) CMCS replaced but is not related to the older BITE system.
Ans b) CMCS monitors the individual BITE systems and presents data.
c) CMCS modifies and upgrades BITE systems
*
Operation of a frequency counter is such that
a) it changes the incoming waveform to a standard square wave.
Ans b) It detects incidences of peak value
c) It compares the incoming waveform with standard sine waves
*
As far as a software product is concerned
Ans a) the 'Verification' phase includes performance testing a programmed EPROM
b) the 'Validation' phase is done to the software rather than to the component.
c) the 'Software Release' phase is the same as the 'Finished Product' phase
*
A segmented configuration for the display of alphanumeric date requires
a) at least 13 segments for all upper and lower case letters
b) the starburst display for numbers and lower case letters only.
Ans c) 16 segments to display the full range of capital letters and numerals
*
For braided cables, the amount of braiding
a) is a trade-off design feature
b) must conform to the requirement for the shielding to cover at least 50% of the surface of the cable
Ans c) keeps radiated power inside the emitting assembly or away from the susceptible circuit
*
Electronic CRT beam display is used typically in
a) IRU control display units.
b) distance measuring indicators; digital counters
Ans c) weather radar indicators
*
What is the quickest method of analogue to digital conversion?
a) Voltage to frequency
Ans b) Flash converter
c) Single ramp method
*
In a colour cathode ray tube, how is the phosphor arranged in the tube?
a) A red layer on the front with two green layers behind it
b) Layers of red, blue and green
Ans c) A single phosphor layer containing red, green and blue
*
An LCD which is back lit is
a) monochrome
b) three colours
Ans c) multicoloured
*
An 8 data input multiplexer has how many Data select lines
Ans a) 3
b) 2
c) 8
*
An electronic flight instrument display consists of;
a) ADC, Altimeter, VSI and ASI
Ans b) Mode control panel, Raster and Stroke generator display, microprocessor and Data inputs
c) ADI, HSI and Symbol generator
*
An octal format hexadecimal number 3F written as binary would be
a) 101 011
b) 110 111
Ans c) 111 111
*
What is a passive device?
a) Matrix LCD
Ans b) Capacitor
c) LED
*
A priority encoder
a) Outputs the selected input
Ans b) Outputs the highest input
c) Outputs the lowest input
*
The data format use to transmit signal to flight data recorder
a) Manchester 2 bi-phase 12 bit
Ans b) Harvard bi-phase 12 bit
c) Bi-Polar RZ 12 bit
*
The output voltage of arinc 429 signal is
a) +5v
b) -5v
Ans c) +10v to -10v
*
How many bytes can be carried in a 32bit word
Ans a) 4 bytes
b) 2 bytes
c) 8 bytes
*
An Arinc 629 label word is
Ans a) 12 bits
b) 8 bits
c) 10 bits
*
Which of the following ESDS devices can withstand higher static electricity voltage?
a) ECL
b) MOSFET
Ans c) SCR
*
An IRU interface test is carried out
Ans a) only on the ground
b) in the air
c) on the ground or in the air
*
For a computer to start up the basic instruction is from the
a) ALU
b) RAM
Ans c) ROM
*
What is a passive device?
a) Matrix LCD
b) LED
Ans c) Capacitor
*
A backlighted LCD
a) has infinite colours
b) is monochrome
Ans c) has only 3 colours
*
An example of a small size integrated circuit would be
a) DIP switch
b) ALU
Ans c) Control Processor Unit
*
The smallest operation possible in a computer is the
Ans a) timing cycle
b) processor sub-cycle
c) processor cycle
*
A common used material in computer manufacturing is
a) ferrite material
b) permeamag material
Ans c) ferromagnetic material
*
FMS system gives warning indications for
a) cruise
b) take off and landings only
Ans c) any flight phase
*
An aircraft on an ILS approach is below the glideslope centre line, the glideslope pointer is
Ans a) above the centre line
b) below the centre line
c) level with the datum
*
A dot matrix/LED construction is
Ans a) 4x7 or a 9x5 rolling end display as per LBP of MODULE 05, BOOK 3,PAGE02, FIG 04, LED DISPLAY
b) 4x7 or a 5x7 rolling end display
c) 5x9 or a 4x7 rolling end display
*
FMS CDU warnings are
a) OFST and Fail
b) fail and MSG
Ans c) MSG, fail and OFST
*
A current mode coupler contains E core assembly. The purpose of the E core is
Ans a) couple the signal to the data bus
b) provide effective screening of the signal through the current mode coupler
c) enable easy access for monitoring purposes
*
Testing of CADC can be carried out
a) in the air
Ans b) ground only
c) air and ground
*
EHSI information displayed, is invalid in the pre-set heading mode when
a) flags out of view
b) flag green
Ans c) flag in view
*
CMC (central maintenance computer) works to
Ans a) perform in-flight bite and ground tests of aircraft systems, ie BITE
b) give red warnings and amber cautions to display in accordance with system status
c) perform in-flight bite only
*
The TX/RX of Arinc629 is
a) encoder/decoder
Ans b) multiplex/de-multiplex
c) switching
*
Terminal gap in ARINC 629 is
a) always the same period
b) flexible
Ans c) can be changed by adjusting the rx/tx software
*
For an IRS System to pass the ‘Alignment System Performance Test’ the
a) entered present latitude and longitude must agree with the latitude and longitude at last power down
b) the No 1 and No 2 must both have the same latitude and longitude present position entered
Ans c) the latitude entered must be within given limits of the latitude computed by IRU
*
The accepted error from INS / IRS is
a) 2 miles / hour + 3 miles
b) l mile / hour + 3 miles
Ans c) 3 miles / hour + 3 miles
*
Control Display Unit (CDU ) selection of TKE (Track Angle Error), displays
a) distance perpendicular from the selected track
Ans b) difference in degrees that the aircraft is to the right or left of the desired track
c) difference in degrees from True North in a clockwise direction from the desired track
*
In the EICAS system, when is the maintenance mode available?
a) On the upper and lower screens - only available on the ground
Ans b) Lower screen only - only available on the ground
c) In flight
*
On a modern aircraft when are BITE checks carried out?
a) When BITE selected
b) After engine shut down
Ans c) Continuously when system is in use
*
What causes the X and Y beam deflections in an EFIS CRT display?
Ans a) Electromagnetic
b) Electrostatic
c) Either
*
In an IN system, the purpose of the stable platform is to
Ans a) prevent unwanted acceleration affecting the accelerometers
b) provide attitude reference
c) stop the gyros from toppling
*
The three accelerometers on a stable platform are mounted
a) parallel to each other
Ans b) orthogonally
c) 12Oo apart
*
An IN system requires data from the
a) doppler system
b) satellites
Ans c) air data computer
*
XTK (cross track) is the
a) angle in degrees that the aircraft track is left or right of desired track
b) actual track across the earth’s surface
Ans c) perpendicular distance from the desired track
*
The output of an INS can be fed to
a) vertical speed indicators
Ans b) attitude indicators
c) altimeters
*
The three accelerometers on a strapdown platform are mounted
a) parallel to each other
Ans b) 90o to each other
c) 120o apart
*
Gyro-compassing is the term used for
a) self-alignment in azimuth
b) self alignment in the vertical
Ans c) use of the gyro-magnetic compass system to align the platform
*
Centralized Aircraft Monitoring System operates to
a) perform in-flight and ground tests of aircraft systems by carrying out a BITE
Ans b) give red warnings and amber cautions to display system status
c) perform in-flight BITE only
*
The control of the speed or rate that the F/D Command bars move can be controlled by
a) position feedback
Ans b) rate or velocity feedback
c) amplifier gain
*
The Centralized Aircraft Monitoring System uses the maintenance mode of operation
a) in the air only
Ans b) on the ground only
c) either ground or air
*
Why does an ARINC databus system send data to LRUs in series?
a) More information can be sent
b) Takes less time
Ans c) Saves weight
*
Can an LRU transmit and receive on more than one 629 bus?
Ans a) Yes
b) No
c) Only if paralleled
*
ARINC 629 LRUs transmit
a) when addressed
Ans b) when terminal gap is sensed
c) when signal gap is sensed
*
How is multiplication achieved in an ALU?
Ans a) by addition
b) by subtraction
c) by coupling
*
What is the function of a status register?
Ans a) To indicate the status of the microprocessor
b) To store a program during an interrupt
c) To synchronise the clock pulse
*
An ADC uses advance approximation to
a) increase resolution
Ans b) increase speed
c) increase accuracy
*
A DAC uses a precision amplifier to
Ans a) ensure the output voltages remain accurate
b) ensure the input remains accurate
c) compensates for the variation of the feedback resistor due to temperature
*
A BCD word occupies bits 11-29, if 11-15 are filled with padders then the LSB of the word will be
Ans a) 16
b) 29
c) 11
*
If part of a display is lost on a CRT, this could be due to
Ans a) an inoperative symbol generator or input sensor
b) an inoperative symbol generator or control panel
c) loss of power to the CRT
*
To reduce HIRF on radio equipment
a) periodically check bonding leads for condition
Ans b) ensure all static wicks are in place
c) transmit on all radio frequencies to determine which frequencies are causing the interference
*
When a BITE test is carried out on a system with moving parts it should be
a) carried out without operating moving parts
Ans b) carried out ensuring all moving parts are operated and taken to there stops
c) carried out ensuring all moving parts are operated but not to there mechanical stops
*
A simplex system has
Ans a) one transmitter, many receivers
b) a bus controller and separate controller
c) one transmitter, one receiver
*
The smallest operation of a CPU is
Ans a) the timescale
b) the processor sub-cycle
c) the processor cycle
*
In a fibre optic system, different light frequencies are separated by
Ans a) an active filter
b) a passive filter
c) a star network
*
The most common CRT for an EFIS system screen is a
a) electrostatic
b) electromagnetic
Ans c) combined
*
Sensors in a fibre optic flight control system
a) require power for processors
Ans b) do not require power
c) require processing to give output
*
An accuracy amp is used to
a) give output at required level
Ans b) compensate for temperature variation
c) make output between 0 - 5V
*
L.E.D.s can give
a) high definition displays
b) red and green displays only
Ans c) monochrome displays only
*
Fibre optic systems can transmit data in
a) one direction only
b) in two directions
Ans c) both directions at the same time
*
When handling a PCB you should ensure that
a) electrical power is isolated
Ans b) ground yourself first to aircraft then PCB
c) ensure you do not touch the ends so that copper contacts do not become contaminated
*
For large bandwidth high-speed fibre optic transmission what sort of cable would you use?
Ans a) Single mode
b) Graded index
c) Step index
*
In an R-2-R ladder converter the values of resistors
Ans a) are precise
b) do not need to be of precise values
c) only the first resistor need to be precise
*
In fibre optics the wavelength of the light is
a) less than visible light
Ans b) more than visible light
c) equal to that of visible light
*
What is the advantage of an ILD over an LED when used as a light source in fibre optics
a) higher bandwidth
Ans b) lower frequency range
c) lower intensity
*
A typical example of a mass storage device is
Ans a) CD ROM
b) IC
c) magnetic tape
*
A typical example of an IC is
a) ALU
Ans b) CPU
c) dip switch
*
A circular time constant produces what sort of output?
a) in phase
b) 180o out of phase
Ans c) 90o out of phase
*
Speed of light in a fibre optic fibre
a) is always the same no matter what material it is
Ans b) is never greater then the speed of light in free space
c) increases if it passes through material of higher refractive index
*
A device, which converts serial to parallel and parallel to serial for arithmetical functions, is a
a) Multiplexer and De-Multiplexer
Ans b) Shift Register
c) Parallel to serial and serial to parallel converter
*
In an Arinc 429 Word label-representing heading is 320, this is represented in bits 1-8 as
Ans a) 01101000
b) 01011001
c) 00001011
*
What would be the outputs if A=0 B=0 C=1
Ans a) 0, 1
b) 1, 1
c) 0, 0
*
What would be the outputs if A=1 B=1 C=0
a) 0, 1
b) 1, 1
Ans c) 1, 0
*
The angle of incidence of a beam of light in a fibre optic cable will be
a) twice that of the cone of acceptance
Ans b) approximately half that of the cone of acceptance
c) parallel with the end of the cable
*
A fibre optic cable is connected to a unit that will not be frequently disconnected. The preferred type of connector to be used is a
a) Ball lens type
Ans b) Butt type
c) Quick disconnect type
*
A cyclic test (watch dog) should be performed for ECAM
Ans a) during power up
b) during in-flight
c) MCDU
*
How is the symbol generator detecting the program error
Ans a) looking at the odd parity without error
b) looking at the even parity without error
c) check sum bites for error detect
*
What is EPROM?
Ans a) erasable programmable read only memory
b) enhanced programmable read only memory
c) erasable programming read only module
*
A CRT is
Ans a) electromagnetic
b) electrostatic
c)solid state i
*
What is used for the power of 10?
a) octal
b) digital
Ans c) decimald
*
What is 44 in hexadecimal?
Ans a) 2c
b) 2d
c)2F
*
What is octal 33in hexadecimal?
a) 22
b) 11
Ans c) 1b
*
At low ambient temperatures, an LCD screen
a) loses contrast
Ans b) is slower to update as data changes
c)viewing angle becomes larger
*
Colour CRT shadowmask screen resolution is
Ans a) 84 triads
b) 400 lines per square inch
c) 600 lines per scan
*
A multiplexer in test equipment could be used for
Ans a) analogue to digital converter
b) frequency divider
c) digital to analogue converter
*
Where does the clock signal in a microiprocessor come from?
a) ALU
Ans b) Control unit
c)Memory
*
Where is the operating program for the CPU stored?
a) ALU
b) Control unit
Ans c)Memory unit
*
An LCD display
Ans a) has three colours only
b) has infinite colours
c)is monochrome
*
In ARINC 629 aperiodic mode, LRUs transmit in order of
a) power up
Ans b) shortest terminal gap to longest terminal gap
c)longest terminal gap to shortest terminal gap
*
ARINC 629, aperiodic mode is used
Ans a) for normal operation
b) for landing and approach operation
c) for database loads
*
What is the device used to convert Binary Coded Decimal into separate supplies for a seven segment digital display?
a) Multiplexer
b) Demultiplexer
Ans c) Decoder
*
A typical example of a mass storage memory device which "write once" and "read many" is
Ans a) a CD Rom
b) an IC
c) a magnetic tape
*
When handling PCB's labelled ESDS, what precaution are taken?
Ans a) Isolate electrical power before installing on Aircraft
b) First earth with aircraft then to it
c) Do not touch its pins as copper contamination can occur
*
A computer consist of at least the C.P.U and
Ans a) memory and input & output port
b) register section, ALU, timing and control section
c) memory, ALU, input & output port
*
Electromagnetic compatibility is achieved by
Ans a) shielding, screening, earthing, bonding and interference filters
b) enclosing the system with same frequency and strength of which screening is done
c) coating in a conductive paint
*
The supply to an LCD is
Ans a) AC
b) current restricted DC
c) voltage restricted DC
*
The method of producing (white) lines for aircraft symbols, V/S scale etc. on an EADI is by
Ans a) stroke scan
b) raster scan
c) trapezoidal input
*
In modern aircraft, the output from the clock is used
a) to synchronise the signals on the control bus
Ans b) give GMT details to the flight recorder and other systems
c) to provide a clock pulse for CRT
*
Audio sounds recorded digitally
a) are not as accurate due to clipping and input errors
Ans b) are superior quality and "data preservation"
c) are narrow bandwidth
*
When carrying out HIRF maintenance on aircraft, the max resistance is
a) 1 milliohm
b) 1 ohm
Ans c) 0.05 ohms
*
A computer message 3B4 is
a) binary
b) octal
Ans c) hexadecimal
*
One of the ARINC 429 formats is
a) hexadecimal
Ans b) BCD
c) octal
*
When does voice data recording commence?
Ans a) On engine start
b) From aircraft take off run
c) After take off when airborne
*
What is 54 octal in hexadecimal
Ans a) 2C
b) 4F
c) 2F
*
A heading reference of 320 degrees in a word label format would be written as
a) 101010001
Ans b) 11010000
c) 01000111
*
Within an EFIS display system, all displays have 1 bit of information missing. What would be the most probable cause?
a) Symbol generator and sensor input
Ans b) Display controller and sensor input bus
c) Display controller and symbol generator
*
A computer using RAM would utilise
a) a compact disc
Ans b) an integrated circuit (chip)
c) magnetic tape
*
With a j-k flip flop which is the output set
Ans a) q = 1
b) q = 0
c) either
*
If the glideslope pointer is below the centre mark the aircraft is
a) on the glideslope
b) below the glideslope
Ans c) above the glideslope
*
2D in decimal is
Ans a) 45
b) 43
c) 41
*
The operational data base of the FMS may have to be modified in flight
a) by the pilot
b) automatically by the DADC
Ans c) It cannot be modified in flight
*
An LED will emit light when
Ans a) it is forward biased
b) it is reverse biased
c) either forward or reverse biased if a sufficient level of ac voltage is applied
*
On an EFIS system the weather radar is displayed on
a) the EADI
Ans b) the EHSI
c) the FMC CDU
*
CADC outputs are
a) altitude, vertical speed, IAS, mach no
b) altitude ,vertical speed, angle of attack, TAT, SAT
Ans c) altitude, vertical speed, TAS, CAS, mach no, SAT, TAT
*
Data is converted from serial to parallel and parallel to serial by
a) a parallel register
Ans b) a shift register
c) a synchronous counter
*
A group of bits transmitted at the same time is
a) a clock signal
Ans b) parallel data
c) serial data
*
A typical characteristic of a CMOS is
Ans a) low power dissipation
b) high voltage handling
c) high power dissipation
*
If one EICAS CRT fails
Ans a) the remaining CRT will display primary EICAS data
b) the FMS CDU will display the failed CRT data
c) the standby CRT will automatically take over
*
84 decimal in hexadecimal is
Ans a) 54
b) f4
c) 5f
*
EADI displays
Ans a) pitch and roll attitudes
b) heading and weather radar
c) pitch, roll and waypoints
*
On an EHSI in weather radar mode, a severe storm would be shown as
a) orange areas with black or yellow surrounds
Ans b) red areas with black surrounds
c) blue areas with white background
*
Variations in light on EFIS displays are compensated for by
Ans a) integrated light dependant resistors in the display compensating for each display individual
b) An external light dependant resistor mounted on the flight deck compensating for all displays in a parallel-parallel format
c) manual adjustment by flight crew on EFIS controller
*
The input bus into a central processor unit is a
Ans a) one way bus
b) bi directional bus
c) two way bus
*
A method used in modern aircraft for reporting in flight faults to an engineering and monitoring ground station is
a) TCAS II
Ans b) ACARS
c) TAWS
*
A CRT display has the advantage over an LCD display by
a) brighter clearer output
b) more energy efficient
Ans c) large viewing angle
*
Most fibre optic connectors are designed so
a) the receptacle has to torque to a designated torque to ensure correct alignment
Ans b) the connectors can not be over tightened
c) the connector can not be replaced on the aircraft
*
The self test function on an EFIS system can be tested
a) in the air only
Ans b) on the ground only
c) in the air and on the ground
*
Each of the symbol generator outputs in an EFIS system can be
Ans a) displayed of each individual display
b) only no. 2 can be displayed on the no.1
c) can not be interchanged
*
An AND gate with inverted inputs and an inverted output is equivalent to
a) an AND gate
Ans b) an OR gate
c) a NOR gate
*
Logic gates internal operating mechanisms are produced from
a) thin film resistors
Ans b) transistors
c) diodes
*
To display a circle on a CRT you use
a) 2 sine waves 180 degrees out of phase
Ans b) 2 sine waves 90 degrees out of phase
c) 2 square wave 90 degrees out of phase
*
The light source used in fibre optics is
Ans a) higher bandwidth than visible light
b) lower bandwidth than visible light
c) visible light
*
When the power is removed from a bi-stable memory device, it's memory will
Ans a) be lost indefinitely
b) be saved indefinitely
c) downloaded to memory
*
BITE tests are inhibited for ground use during
a) take-off
b) gear retraction
Ans c) forward motion
*
Software changes come under the responsibility of
a) the national aviation authority
Ans b) the aircraft constructor
c) the engineer
*
A multiplexer
Ans a) takes many signals in and converts it to a serial transmission output
b) takes one signal in and converts it to a parallel transmission output
c) takes many signals in and puts these in a parallel transmission on the output
*
The CPU consists of
a) register and arithmetic logic unit only
Ans b) ALU, timing and control section, register
c) register, timing and control section only
*
The ARINC 429 system uses the following system to transfer data
a) non return to zero
b) harvard bi phase
Ans c) bi-directional return to zero
*
Which of the following ARINCs are bidirectional?
a) 429
Ans b) 629
c) 573
*
Data is transferred on the MIL-STD-1553B by using
a) bipolar return to zero
Ans b) manchester bi-phase
c) non return to zero
*
The general arrangement of ARINC 629 includes
a) current mode coupler, data bus cable only
b) data bus cable, stub cable, voltage mode coupler
Ans c) data bus cable, current mode coupler, stub cable
*
To deflect the beam of a CRT horizontally, coils are placed on the neck of the tube
a) one on the side, one at the bottom
b) each side
Ans c) top and bottom
*
During flight (non fault conditions) the EICAS system displays on the lower CRT
Ans a) secondary engine parameters
b) synoptic display
c) flight phase page
*
Who can design new software?
Ans a) BCAR section A8 approved company
b) BCAR section A1 approved company
c) The CAA
*
Data bus cables are terminated using
Ans a) 130 ohms resistor
b) 100 ohms resistor
c) 25 ohms resistor
*
Modern aircraft with electronic displays would display information on airframe and engine on which system?
a) Flight management system
Ans b) Electronic centralised aircraft monitoring system (ECAM)
c) EADI
*
The Flight data recorder starts recording
a) after take off
b) on aircraft roll out from stand
Ans c) after the first engine has started
*
Data to flight data recorder can be taken form a communal data bus if
a) it goes directly to it
b) the power is within flight data recorder limits
Ans c) if source isolation has been considered
*
In arinc 429 data field is bits 11 to 28. If the bits 11 to 18 had pad bits, the L.S.B. Of the data would be
Ans a) bit 19
b) bit 11
c) bit 28
*
The BCD data field of arinc 429 is contained within bits
a) 1- 8
Ans b) 11- 29
c) 11- 28
*
After attaching a wrist strap to you wrist (which is connected to aircraft ground), prior to removal of ESDS equipment, the resistance measured
a) between the strap and the pin ground must be >10 Megohms
Ans b) between your skin and the pin ground must be <10 megohms
c) between the strap and the pin ground must be <10 meghms
*
The major source of degradation of HIRF protection is
a) corrosion
b) damage to static wicks
Ans c) radio filter break down
*
The resistance of the magnetic coils of a C.R.T. Is offset by using
Ans a) trapezoidal voltage
b) constant voltage
c) saw tooth voltage
*
If the magnetic deflection plates produce a magnetic field which is parallel to the horizontal then the trace is deflected in
a) horizontal axis
b) circular motion
Ans c) vertical axis
*
Light transmission in a fibre optic cable is due to
Ans a) repeated internal reflection
b) refraction of the light
c) defraction of the light
*
The name given to the joining of two fibre optic cables by aligning them carefully and bringing them into close proximity of each other is
a) Fusion
Ans b) End to end
c) Lens Coupling
*
In a fibre optic cable
a) only one data signal can be sent down it at any one time
Ans b) multiple data signals can be sent down it at one time
c) data can only be sent in one direction
*
A logic 1 may be represented in an analogue system by (where Q is an output of a latch / flip-flop)
a) switch open / light on / Q
b) switch closed / light off / Not Q
Ans c) positive / magnetised / Q
*
A central fault display system should be available through
a) a bite test
Ans b) a easily accessible multifunction control display unit
c) a central bite test box with clear LED indications
*
An analogue to digital converter where it counts up to binary state equal to the analogue in put and then back down when this is reached is a
a) successive approximation counter
Ans b) a tracking ramp type converter
c) flash type converter
*
Transistors are used in a current triggered D to A device to
a) switch on the input
b) switch of the inputs
Ans c) change the state of the inputs
*
Radio altitude is displayed on a EFIS system
a) on the Electronic horizontal situation indicator
Ans b) on the electronic artificial direction indicator
c) on the RMI
*
A flight data recorder should be capable of recording
a) the last 25 hours
b) the last 25 hours of aircraft flight
Ans c) the last 25 hours with engines running
*
Op amps generally used in ADCs and DACs are normally
Ans a) high input impedance, low output impedance
b) high input impedance , high output impedance
c) low input impedance , how output impedance
*
Magnetic materials are used in
a) ROMs only
Ans b) some RAMs
c) EPROM
*
The pins on an op amp are numbered
a) clockwise
Ans b) anticlockwise
c) cross ways
*
A parallel register
Ans a) reads each bit to be stored simultaneously
b) requires a clock pulse for each bit
c) reads the stored data when logic 0 is applied to the read line
HIRF protection is in the order of
Ans a) hardened skin and protecting wires / LRUs
b) bonding as many parts of the aircraft as possible and a maximum resistance of 0.05ohms
c) periodically turn off components whilst radio transmitting
*
16 hexadecimal converted to decimal is equivalent to
a) 38
b) 48
Ans c) 22
*
To get logic 1 using this gate
a) A or B = 1
b) A and B = 1
Ans c) A and B = 0
*
What logic gate would this circuit represent?
a) NAND Gate
b) NOR gate
Ans c) AND gate
*
Decimal 10 converted to binary is
a) 1111
b) 1001
Ans c) 1010
*
What systems uses base 10?
Ans a) Decimal
b) Digital
c) Octal
*
What systems use base 16?
a) Octal
b) BCD
Ans c) Hexadecimal
*
EADI pointers, dials and engine data is produced using
Ans a) stroke
b) raster
c) electromagnetic waves
*
Fibre optic cables consists of a silica glass core and
Ans a) refractive outer cladding
b) reflective outer cladding
c) reflective inner cladding
*
The waveform to the coil of a CRT is
Ans a) trapezoidal
b) ramp
c) analogue
*
Analogue logic 1 is
a) closed switch, Logic Q=0
Ans b) closed circuit, Logic Q=1
c) open circuit
*
ARINC 629 is transmitted using
Ans a) fibre optics or twisted pair of wires
b) single wire for each transmitter
c) SWG 28 wire
*
BITE for ground use only is switched off
a) when breaks are released
b) when undercarriage up
Ans c) on take-off
*
Fibre optics relies on
a) fibre absorbing light
Ans b) light reflecting off cladding
c) light escaping cladding
*
The "light" emitted from a LED used within a fibre-optic system will have a wavelength
Ans a) slightly longer then that of visible light
b) slightly shorter then that of visible light
c) equal to that of visible light
*
Binary coded decimal (BCD) format has a minimum of
Ans a) four "0s" or "1s"
b) 2 lots of four "0s" or "1s"
c) 3 lots of four "0s" or "1s"
*
A simplex system has
Ans a) 1 transmitter and multiple receivers
b) 1 bus controller and 1 remote terminal
c) 1 bus controller and multiple receivers
*
Fibre optic cable over copper cable has the following advantages
a) non-conductive, easier to manufacture and assemble, greater bandwidth
Ans b) non-conductive, greater bandwidth, greater signal security
c) greater bandwidth, greater signal security, more robust
*
A EFIS system ADI displays pitch, roll
a) autoland, altitude, compass rose and flight director bars
b) autoland, decision height, range to altitude and flight director bars and slip indicator
Ans c) autoland, rad alt, decision height and slip indicator
*
What is the Hexadecimal number F86 in Binary?
Ans a) 111110000110
b) 111110000001
c) 3974
*
What is 11000012 - 1011002?
a) 1101112
b) 100011012
Ans c) 1101012
*
During normal functioning of an ECAM system the engine data shown on the Engine/Warning display comes from the
a) EFIS channel of DMC3
Ans b) ECAM channel of DMC1
c) ECAM channel of DMC3
*
To create a bi-directional communications link within an ARINC 429 system
a) only one databus is required
Ans b) two databuses are required
c) four databuses are required
*
Using I.N.S. an aircraft flies
a) course directed by ground station
Ans b) great circle route
c) rhumb line
*
What warnings can an FMS provide?
Ans a) Discrete warnings
b) Spurious faults
c) Ground faults only
*
Aircraft heading (HDG) is
a) the angle between True North and the desired track
b) the angle between True North and the actual track
Ans c) the angle between True North and the longitudinal axis of the aircraft
*
What must be entered into the IRS before the aircraft can be moved?
Ans a) Present position
b) Flight plan
c) Cruise height
*
The FMS Operational Data Base is
a) updated once a month
Ans b) is fed with information on aircraft weight, cruise altitude and cost index before take off
c) needs no update information
*
Control surface feedback is fed back to
Ans a) the Flight Control Computer only
b) the Flight Control Computer and side stick controller
c) the side stick controller only
*
The function of a commutator is to
a) convert from analogue to binary form
Ans b) provide a sampling in sequence of a number of parameters
c) provide continuous availability of all parameters connected to the system
*
When the voltage that represents a logic 1 state is less than the voltage that represents a logic 0 state, the logic being used is
a) either positive or negative
b) positive
Ans c) negative
*
The output of an AND gate having two inputs A and B is logic 1. The two inputs will have the logic states of
a) A = 0, B = 0
Ans b) A = 1, B = 1
c) A = 1, B = 0
*
Registers are used in digital computers to
a) store bits of information in a permanent memory
Ans b) store a limited amount of information on a temporary basis
c) keep a count of operations completed
*
What is 0111000012 in Octal?
a) 28110
b) 2258
Ans c) 3418
*
ARINC 629 is used for
Ans a) normal flight
b) emergency only
c) a backup to ARINC 429
*
Testing of HIRF on aircraft systems is done
a) by periodically listening for interference on all systems
Ans b) at and during production and testing (initial certification)
c) only after a report of radio interference
*
How are earth loops prevented from forming?
Ans a) Ground only one end of the cable screen
b) Ground both ends of the cable screen
c) Ground neither end of the cable screen
*
When carrying out a bonding check on a surface protected by anodic film
Ans a) the anodic film should be removed locally to ensure a good contact
b) the film is conductive so no preparations are required
c) add a bonding factor to the result of the test to account for the resistance of the anodic film
*
The accelerometer output in an INS/IRS is
a) integrated twice to give velocity
Ans b) integrated twice to give distance
c) integrated once to give distance
*
An INS/IRS Battery Unit provides
Ans a) standby power when airborne and on the ground
b) standby power only whilst in flight
c) standby power only on the ground
*
The FMS Navigation Data Base must be updated
a) once a month
Ans b) every 28 days
c) before each flight to establish the flight plan
*
If a fly by wire actuator loses hydraulic power the control surface will
a) automatically move back to the neutral position
b) remain rigid in the failure position
Ans c) remain in the failure position but may move due to aerodynamic pressure
*
The output of an OR gate having two inputs A and B is logic 0. The two inputs will have the logic states of
Ans a) A = 0, B = 0
b) A = 1, B = 0
c) A = 0, B = 1
*
When clamping cable looms containing co-axial cables
Ans a) avoid distortion to the co-axial cable to maintain the dielectric constant
b) distortion of the outer sheath is allowed providing the inner cable is not affected
c) the clamps must be no more than 1 metre apart
*
When incorporating an aerial cable it must be
a) in the centre of the other wires
b) outside the other wires for easy access
Ans c) positioned separately from the loom
*
Some of the advantages of fiber optic cable over copper cable are
a) non conductive, easy to manufacture and assemble, higher bandwidth
b) smaller size and weight, non conductive, more rugged, higher security
Ans c) non conductive, higher bandwidth, higher security, smaller size and weight
*
When carrying out airframe bonding checks as part of a program of HIRF prevention the airframe bonding resistance should be less than
Ans a) 50 milliohms
b) 100 milliohms
c) 1 ohm
*
LCD screens are driven by
Ans a) ac voltage
b) variable current dc voltage
c) fixed current dc voltage
*
IRS alignment
Ans a) takes up to 10 minutes and the present position can be entered at any time during alignment
b) takes up to 10 minutes and present position must be entered before alignment.
c) takes up to 10 minutes and the previous flight shut down present position is used for the alignment
*
A fault light appears on the IRS Mode Selector Unit during the alignment sequence. The correct action is
a) immediately switch off and select the standby system.
Ans b) select HDG/STS on the Inertial System Display Unit (ISDU), observe the action code in the right alpha/numeric display
c) refer to the warning display on the EICAS/ECAM system.
*
EFlS systems have two control panels, their purpose is
a) to provide display control by one control panel whilst the other provides a standby
b) one for the EADI display and one for the EHSI display
Ans c) one to control the type of EFlS display and the other to select the source of the information being displayed
*
A FMS has a total of how many Data Bases
a) 1
Ans b) 2
c) 4
*
Fly by wire High Speed protection is
a) to prevent high speed stall
b) to increase the pitch angle as speed increases
Ans c) to prevent tuck under
*
In a single mode fibre optic cable
a) several waves travel down the cable
Ans b) the diameter of the cable is dependent on the wavelength of the light used*
c) the distortion of the signal occurs is dependent on the length of cable
*
A semiconductor which emits photons and releases electrons when stimulated by photons is called
a) an LED
b) a photodiode
Ans c) a laser diode
*
An IRS Laser gyro provides
Ans a) detection of the rate of movement about an aircraft axis
b) detection of the earth’s rotation to establish true north
c) detection of the earth’s gravitational force to establish true north
*
A Liquid Crystal Display (LCD) has the advantage over a CRT because
a) it displays more colours
b) it requires less servicing
Ans c) it requires no cooling
*
The left and right cockpit displays
a) are supplied from separate Symbol Generators at all times
b) are supplied from the same Symbol Generator
Ans c) will only be supplied from the same symbol generator when all other symbol generators have failed
*
A single failure of a fly by wire control surface computer will
a) cause the system to revert to an alternate law of operation
b) cause the system to revert to a direct law of operation
Ans c) not have any operational effect on the system
*
An encoder changes
a) analogue to digital
b) digital to analogue
Ans c) data from one format to another
*
An encoder using Grey code
Ans a) changes analogue to digital
b) changes analogue to binary
c) changes digital to analogue
*
What is the Low Speed transmission rate for ARINC 429?
Ans a) 12 – 14.5 kbits / second
b) 100 kbits / second
c) 120 kbits / second
*
What is this symbol:
a) Exclusive AND gate
Ans b) Exclusive OR gate
c) Exclusive NOR gate
*
What Logic Gate does this switch circuit indicate?
a) AND gate
Ans b) OR gate
c) NOR gate
*
What is the effect of a level 1 software failure?
a) Significant reduction in safety margins
b) Large reduction in safety margins
Ans c) Loss of aircraft and / or fatalities
*
Ribbon cables affected by mutual impedance and current loop leakage are protected by
a) earthing each conductor
Ans b) earthing each alternate conductor
c) wrapping the complete ribbon in an earthed shield
*
What is the definition of baud rate?
Ans a) 1 bit per second
b) 1 byte per second
c) 1 word per second
*
An RS flip-flop with Q at 1 is said to be
a) reset
Ans b) set
c) zero
*
What does the logic circuit below represent?
a) Half adder circuit
Ans b) Full Adder Circuit
c) Multi-bit adder
*
The release of a photon by another photon is an example of
a) a zener diode
Ans b) an LED
c) a photo diode
*
When a JK flip flop is used as a memory device, what type of memory would it be
a) non-volatile
b) read-only
Ans c) volatile
*
Once an ARINC 629 LRU has transmitted a message it will wait how long before transmitting again?
a) Until the end of the synchronization gap.
Ans b) Until the end of the transmit interval
c) Until the start of the terminal gap
*
How is the word label 206 written in ARINC 429?
a) Decimal 206
b) Binary 11000110
Ans c) Octal 01100001
*
What is ARINC 561 used for?
a) Flight Data Recorder systems
b) Fly by Wire systems
Ans c) Inertial Navigation Systems
*
What are the outputs from digital clocks used for?
a) VOR, ILS and DME
Ans b) Flight data acquisition unit, Flight management computer and Voice recorder
c) Weather radar, TCAS and ACARS
*
What does a fibre optic star connection do?
Ans a) Provides direct point-to-point services to units on dedicated lines emanating from the central hub
b) Provides a continuous loop of fibre interconnecting all nodes
c) Shares a common bandwidth of a common cable
*
What is the purpose of the ALU?
a) To convert serial into parallel data
b) To store data being used by the CPU
Ans c) The part of the CPU unit where arithmetic & logic operations are carried out
*
Which logic gate has both inputs ‘high’ to get an output?
a) NAND gate
b) OR gate
Ans c) AND gate
*
Which would have the least components?
Ans a) ALU
b) CPU
c) LSI
*
How many address lines would be needed for an 8 line MUX?
a) 4
Ans b) 3
c) 2
*
In a MUX, how is parallel converted to serial?
Ans a) By way of a shift register
b) By way of a demultiplexer
c) By way of an encoder
*
If a magnetic field is parallel to the X plates in a CRT, which way will the beam move?
a) Diagonally
b) Vertically
Ans c) Horizontally
*
What would you expect to see displayed on an EADI display?
Ans a) Flight director command bars, slip indicator, rate to altitude & autoland
b) Compass heading, selected heading and VOR
c) Course information, weather radar, way point alert and bearing pointers
*
The binary number 10101000111001012 in hexadecimal is:
a) 22BC16
Ans b) A8E516
c) FFFF16
*
A fibreoptic lens type coupling with lens and integral LED compared to an end-fire coupling is
Ans a) more efficient
b) less efficient
c) equally efficient
*
An analogue to digital converter is as accurate as
Ans a) the sampling rate
b) the frequency
c) the amplitude
*
A digital to analogue converter that requires the output to range between 0v and -10v would have
a) a non-inverting amplifier in parallel with the output line
Ans b) an inverting amplifier in series with the output line
c) a non-inverting amplifier in line with the output with a resistor to ground
*
An LED display is
a) red and green
Ans b) monochrome only
c) high definition
*
An EFIS ADI display will show along with pitch and roll
a) flight director bars, autoland, compass rose, altitude
b) flight director bars, autoland, altitude, range to altitude, decision height
Ans c) decision height, autoland, rad alt , altitude
*
A full operation system BITE check will
Ans a) carry out a internal system test that ensures the system meets design requirements and is operational
b) as well as checking full system will move the controls to their stops
c) as well as checking full system will not move the controls to their stops
*
If on a flight deck EFIS system all the displays were missing one bit of information this is most likely to be
a) the symbol generator and display
Ans b) the input sensor bus and display controller
c) the display controller and symbol generator
*
A arinc data word is bits 11-29, if bits 11-18 are patched which of the following would be the LSB bit
Ans a) 19
b) 29
c) 21
*
What is a band?
a) A block of data
Ans b) A bit of data
c) A byte of data
*
Passive sensors in fibre optics
a) require power for the processing signal before they send them down the fibre optic
b) require no power and they do not process signals
Ans c) process the signal but do not require power
*
An LCD display uses what type of power supply?
Ans a) Continuous AC
b) Variable level DC voltage
c) DC voltage
*
Fibre optic data bus links are
Ans a) bi-directional
b) one way data buses
c) simplex
*
0011011000101001 when transferred to computer language this information can be a representation of
a) binary, octal or decimal numbers
Ans b) hex, octal and binary numbers
c) hex, octal and decimal numbers
*
In a bi-stable memory circuit
Ans a) the memory is lost as soon as power is removed
b) the memory is retained indefinably
c) the memory needs to be refreshed constantly, even when power is on
*
In an analogue to digital converter, the input voltage
Ans a) stays on constantly
b) is switched by the digital input
c) is intermittent
*
In an RS flip flop output is one. This means it is
Ans a) set
b) reset
c) intermediate
*
ARINC 629 utilizes
Ans a) full duplex
b) half duplex
c) simplex
*
Optical fibre losses are due to
a) absorption only
Ans b) absorption, scattering and reflection
c) radiation, absorption and reflection
*
The cone of acceptance is measured between
Ans a) longitudinal axis of the core and the outer angle
b) the two outer angles
c) the diameter of the core
*
An R-2R Converter has values or resistance
a) whose precision are accurate
Ans b) whose relative precision are accurate
c) whose precision are not accurate
*
An ALU is an example of
Ans a) LSI
b) SSI
c) MSI
*
What does 1 represent in an analogue system?
Ans a) Switches closed, magnetised
b) Switches open, unmagnetised
c) High frequency
*
A centralised monitoring computer system is used
a) to test system during flight and for BITE test of systems on the ground using a carry on control unit
Ans b) to test systems in flight and on the ground using a centralised on board control unit
c) testing systems on the ground only
*
A signal in an ARINC 629 system uses
a) a pair of wires per transmitter unit
Ans b) a twisted pair of wires or fibre optics
c) a single wire
*
A beam deflection on EFIS displays are
Ans a) electromagnetism
b) electrostatic
c) solid state
*
A nand and nor to become a not gate have
Ans a) inputs connected together
b) inputs inverted
c) outputs inverted
*
An in-series ARINC 429 system transmits using
a) wave dividing multiplexing
Ans b) time dividing multiplexing
c) encoder
*
Fibre optic cables use
a) reflective outer shell
Ans b) refractive outer shell
c) reflective inner shell
*
A sinusoidal circular time constant produces what output?
Ans a) 90 degrees out of phase
b) 180 degrees out of phase
c) In phase
*
A terminal controller
a) transmits only when addressed
b) is repetitive transmitting
Ans c) will transmit only once during each transmit interval
*
What is the advantage of series over parallel message sending?
a) Quicker
b) More information sent
Ans c) Only one pair of conductors
*
The number of LRUs which transmit/receive on ARINC-429 is dependent upon
a) size of S.D.I
b) speed of transmission & size of aircraft systems
Ans c) parallel input impedance
*
In fibre optic cable, signals are separated by
Ans a) active optic filter
b) passive optic filter
c) low pass filter
*
In an EFIS display, the lines, Scales, Indicator and Synoptic are generated by
a) synoptic scan
Ans b) stroke scan
c) raster scan
*
Speed of computer process information depends upon
a) the size of the programme
Ans b) the time period to access the memory
c) the external inputs to the system
*
ARINC Communications Addressing and Reporting Systems is used to
a) download aircraft status reports
Ans b) connect the aircraft to base
c) make telephone calls
*
ARINC 429 data bus systems uses
a) decimal numbering
b) hexadecimal numbering
Ans c) binary coded decimal
*
With radio coupled autopilot, what are the inputs
a) ADF and ILS
b) ADF and VOR
Ans c) ILS and VOR
*
B-RNAV system must be capable of
a) holding six waypoints
Ans b) displaying distance and bearing to waypoint
c) reversing the waypoints for "fly-me-home"
*
The basic principle of radar is based upon
a) the amount of power in the signal returned
Ans b) the time delay between outward and returning pulse
c) ultrasonic wave propagation
*
An ARINC 429 Binary Coded Decimal word occupies word bits
a) 11 - 28
Ans b) 11 - 29
c) 1 - 8
*
Engine parameters are displayed on
Ans a) ECAM
b) EHSI
c) CDU
*
A flight deck CRT LRU is being replaced. What does the ESDS label indicate?
a) Wrist straps should be worn
Ans b) Do not touch plug pins or leave them exposed
c) Remove power before connecting
*
What systems does the ADC feed?
a) Altimeter / FMS / secondary radar
b) Standby altimeter/machmeter
Ans c) Cabin pressure controller sensor / machmeter / Altimeter
*
A hexadecimal is a number to base
a) 8
b) 2
Ans c) 16
*
An ARINC 429 system uses a
a) 16 bit word over a twisted pair of wires
Ans b) 32 bit word over a twisted pair of wires
c) 20 bit word over a bi-directional bus
*
A thyristor is a device which has
a) a positive temperature coefficient
Ans b) a negative temperature coefficient
c) a temperature coefficient of zero
*
When using a wrist strap, before touching the LRU the resistance should be measured from your skin to the end of the earth probe. This should be
Ans a) more than 10 kilohms
b) less than 10 kilohms
c) less than 1 ohm
*
1012converted to decimal is
a) 52
Ans b) 510
c) 210
*
Physical variables in quantitative forms, such as voltage or angular rotation of a shaft are
Ans a) analogue
b) digital
c) binary
*
Within a 3 bit frequency cascade, division is to
Ans a) 8
b) 4
c) 2
*
When is a radio altimeter active?
a) Up to 10,000 ft
Ans b) Up to 2,500 ft
c) Up to 100 ft
*
Which of the following could be a primary cause of HIRF protection failure?
Ans a) Unserviceable radio filters
b) Broken or missing static wicks
c) Corrosion on bonding leads
*
The binary coded decimal number 10011000 expressed as a decimal number is
Ans a) 9810
b) 15210
c) 1522
*
The decimal number 7 expressed as a binary number is
Ans a) 1112
b) 72
c) 1012
*
Convert 011101 binary to octal
a) 25
b) 33
Ans c) 35
*
Manufacturers of aircraft can ensure HIRF protection
Ans a) by designing specific avionic areas that are shielded against HIRF
b) by ensuring all single wires are shielded with metal conduit
c) by advising the operator of parts of the aircraft susceptible to degradation due to corrosion, moisture ingress, flexing etc.
*
An ARINC 629 characteristic is
a) all LRUs can transmit at the same time
b) all LRUs can transmit and receive at the same time
Ans c) data can transmit in both directions down the data bus
*
In an ARINC 429 word string, bits 1 - 8 represent
a) the source of the message
Ans b) the monitored parameter
c) the destination LRU
*
What limits the number of ARINC 429 receivers on a bus
a) The speed and size
Ans b) The parallel input impedance
c) The weight
*
The 'fan-in' in a gate is the
a) number of outputs from a gate
Ans b) number of inputs to a gate
c) number of inputs and outputs of a gate
*
Very Large Scale Integrated (VLSI) means the number of gates in a single IC is
a) up to 1000
b) up to 10,000
Ans c) over 10,000
*
The advantage of DRAM over SRAM is
a) they operate slower
b) has a larger storage capacity per chip area
Ans c) are cheaper to manufacture
*
A BYTE is usually
a) a 12 bit word
Ans b) an 8 bit word
c) a six bit word
*
Data is transferred on the MIL-STD-1553B by
a) bi-polar return to zero
Ans b) manchester bi-phase
c) non return to zero
*
The fibre optic cable can be identified on aircraft by its jacket colour which is
Ans a) purple
b) red
c) yellow
*
For a fibre optic cable connector that is not regularly disconnected you would use the
a) ceramic lens type
b) ball lens type
Ans c) butt type
*
The timebase in a CRT consists of
Ans a) an amplifier and an oscillator
b) an oscillator only
c) an amplifier only
*
HIRF protection of LRUs is provided by
Ans a) built in filters and overvoltage circuits
b) internally shielded cables
c) built in filters only
*
An EADI display of flight director commands are coloured
a) cyan
b) red
Ans c) magenta
*
Which systems does a modern ADC give information to?
Ans a) Flight control computer, Air Data Instrument, Engine systems
b) EFIS
c) EICAS
*
Binary Number: 110010
a) 80
Ans b) 50
c) 34
*
How are engine indications sent to the FDR?
Ans a) Via ARINC 573
b) Via ARINC 629
c) Source isolated
*
What is this truth table?
A.B
|
B
|
A
|
0
|
0
|
0
|
0
|
0
|
1
|
0
|
1
|
0
|
1
|
1
|
1
|
Ans a) AND gate
b) NOR gate
c) NOT gate
*
Where do the outputs from a DADC go?
a) EADI
b) EHSI
Ans c) IRMP: Inertial Reference Mode Panel
*
During an EFIS screen fit
a) use bonding strap
Ans b) don’t touch terminals
c) no tooling is required
*
To stop earth loops forming, you would
a) leave both ends of the cable screen open circuit
b) earth both ends of the cable screen
Ans c) earth only one end of the cable screen
*
How many satellite signals are required to achieve precise 3D positioning?
Ans a) 4
b) 5
c) 6
*
Binary addition of 1101 + 101101 is
Ans a) 58
b) 61
c) 70
*
What system uses base 8?
Ans a) ARINC 429, in dataword labels only
b) ARINC 629
c) ARINC 573
*
What maintenance problems are associated fibre optics?
a) Corrosion
b) Earthing faults
Ans c) Kinking and contamination of connectors
*
Who can sign for a software update?
Ans a) Design organization or the aircraft manufacturer
b) Engineer
c) Chief pilot
*
What sort of gate is this?
a) Or gate
Ans b) NOR gate
c) NOT gate
*
What creates the raster effect on a CRT?
Ans a) Sawtooth frequency
b) Sinusoidal frequency
c) Trapezoidal
*
Common fibre optic use is
a) modulating intensity on direct read
Ans b) modulating frequency on direct read
c) HIRF
*
An aircraft may have been HIRF affected.
Ans a) A static wick check is required
b) A bonding load check is required
c) Test all radio frequencies for interference
*
The binary number 11010111 is expressed as a decimal is:
Ans a) 215
b) 107
c) 53
*
The octal number 1001 expressed as a decimal is:
Ans a) 513
b) 613
c) 713
*
With a relative humidity of 10% to 20%, if you walked over a carpet what electrostatic voltage value would you expect to see?
a) 6,000 volts
b) 12,000 volts
Ans c) 35,000 volts
*
Before fitting a Printed Circuit Board you should check the
a) resistance between skin and strap end plug is less than 10 megohms
Ans b) resistance between skin and strap end plug is more than 1 megohms
c) resistance between strap and strap end plug is less than 1 megohms
*
A fibre optic data bus
a) can only transmit 1 message at a time
Ans b) can transmit several messages simultaneously
c) is only used for non essential messages
*
The minimum requirement for an aeroplane CVR is
a) from power on
b) from engine start
Ans c) from beginning of take off roll
*
On an ARINC 629 data bus, the maximum amount of current-mode couplers per data bus is
a) 46
Ans b) 120
c) 64
*
To connect a LRU to the data bus
Ans a) a current mode coupler, serial interface module and terminal controller is required
b) current mode coupler, terminal controller and a production break is required
c) a terminal controller and interface module only is required
*
A current-mode coupler contains an E-Core assembly. The purpose of the E-Core is to
Ans a) couple the signal to the data bus
b) provide effective screening of the signal through the current-mode coupler
c) enable easy access for monitoring of the signal
*
The ARINC 429 low rate of transmission is
Ans a) 12-14 Kbits/second with high of 100 kBits/second
b) 12-14 Mbits/second with high of 100 Mbits/secon
c) 100 kbits/second with high of 12-14 Mbits/second
*
A D to A converter is required to produce an output range of 0 to –10V. This can be achieved by
a) A non inverting op amp connected in parallel with output
Ans b) An inverting op amp connected in parallel with output
c) A differentiator with a 100 Kilohm feedback resistor
*
A D to A converter would use a precision amplifier to
Ans a) Ensure that the output voltages remain accurate
b) Ensure that the input voltage remains accurate
c) Compensate for the variation of the feedback resistor with temperature
*
A given transducer provides a voltage which corresponds to true heading. This voltage can be converted to 'bits' by using a
a) commutator
b) digital to analogue converter
Ans c) analogue to digital converter
*
The output of a NOT gate is logic 1. The input is
a) logic 1
Ans b) logic 0
c) both logic 1
*
An ARINC 629 bus cable is a twisted pair of wires with
a) a 130 ohm resistor at one end
b) a 230 ohm resistor at one end
Ans c) a 130 ohm resistor at both ends
*
An ARINC 629 stub cable
Ans a) connects bi-directional data between the LRU and current mode coupler
b) connects single directional data between the LRU and current mode coupler
c) connects bi-directional data between two LRUs
*
Care must be taken when installing ARINC 629 cables into bus panels, damage to cables can cause
a) arcing of high voltage signals
b) standing waves.
Ans c) corrosion of the conductor
*
An aircraft data bus system
a) cannot use both ARINC 629 and ARINC 429 data buses.
b) can use both ARINC 629 and ARINC 429 as they are compatible.
Ans c) can use both systems, ARINC 629 and ARINC 429 via system card files and signal gateways
*
An Inertial Navigation System (INS/IRS) computes distance from acceleration by
a) a simple integration
b) a differentiation followed by an integration
Ans c) two successive integrations
*
Before the aircraft is moved from the loading pier the pilot must
Ans a) insert the latitude and longitude of the pier into the IRS
b) set the altitude to be fed into the INS
c) insert the longitude and latitude of the first waypoint into the INS
*
A 12 bit 16 Channel encoder will use a multiplexer with
Ans a) 2 wire series address line
b) 3 bit parallel address line
c) 4 bit parallel address line
*
An A to D converter uses successive approximation to
a) increase resolution
Ans b) increase speed
c) increase accuracy
*
An R-2R D to A converter uses
a) two values of resistors whose precision is not important
Ans b) two values of precision resistors
c) resistors whose values are logarithmic
*
A fiber optic cable to LRU connector should be connected
a) using torque-loaded pliers
b) hand tight only
Ans c) very carefully to ensure alignment and reduce light loss
*
An IRS has
a) accelerometers fixed to the airframe and gyros on a stable platform
Ans b) accelerometers and gyros fixed to a the airframe
c) accelerometers on a stable platform and gyros fixed to the airframe
*
An IRS system requires data for wind computation from
Ans a) central Air Data Computer
b) satellites
c) Doppler System
*
The FMS carries out a Rho/Theta navigation function, the purpose of this is to
Ans a) update the IRS system with an accurate position fix of latitude and longitude
b) to update the EMS with the new lateral flight profile for the flight plan
c) to update the VOR and DME systems with an accurate position fix
*
The FMS is updated
a) by the aircrew by reference to the Tech Log
b) automatically by update data from the ACARS
Ans c) by an aircraft engineer updates the system either by a magnetic tape or floppy disc
*
Pitch Control of a fly by wire system is achieved by
a) elevators only
Ans b) stabilizer and elevator
c) stabilizer only
*
In a fly by wire system, if the pilot control input is derived from a side stick controller:
a) control surface feedback is fed to the side stick
Ans b) there is no control surface feedback to the side stick
c) there will be only control surface feedback to the side stick after a computer failure
*
In memory using multivibrators, when power is switched off the data will
a) still be available on power up
Ans b) be lost
c) automatically be downloaded
*
The resistance of the wrist strap used as part of anti static precautions should be
a) 0 - 200 ohm
b) 250 kilohm - 1.5 megohm
Ans c) 20 megohm - 200 megohm
*
What is the function of a status register in a microprocessor?
Ans a) To indicate the status of the processor
b) In the ALU, to store the position of the program during an interrupt
c) To synchronize the clock pulse
*
What is the advantage of EPROM over fusible link?
a) Cheaper to produce
Ans b) Can be re-programmed
c) Does not need refreshing
*
A basic IRS platform has
a) 3 accelerometers and 2 laser gyros
b) 2 Accelerometers and 3 laser gyros
Ans c) 3 accelerometers and 3 laser gyros
*
What frequency creates the raster effect on a CRT?
Ans a) 50/60 Hz
b) 400 Hz
c) 250Hz
*
If an EFIS has 3 symbol generators, what is the purpose of the 3rd symbol generator?
a) Comparison with No.1 symbol generator
Ans b) Standby
c) Parity function
*
The sweep waveform used on a electromagnetic CRT is
Ans a) trapezoidal
b) sinusoidal
c) sawtooth
*
FMS operational program is updated every
a) 7 days
Ans b) 28 days
c) 90 days
*
Fibre optic data is sent by
Ans a) modulating the frequency of a laser beam
b) modulating the frequency of a filament beam
c) a strobe light
*
What is 345 in binary?
a) 100111001
b) 110011001
Ans c) 101011001
*
Which logic gate can be represented as a parallel circuit?
Ans a) OR gate
b) Exclusive OR gate
c) NAND gate
*
Software documentation procedures are laid down in
Ans a) AWN 45
b) JAA Ops
c) MOE
*
HIRF is prevented from entering a fibre optic cable by
a) enclosing it in a metal braid
b) grounding the fibre at both ends
Ans c) using an opto-isolator coupling
*
In an ARINC 429 wordstring, bits 1 to 8 represent the
a) source of message
Ans b) monitored parameter
c) destination LRU address
*
ARINC 629 terminal transmit interval is
a) unique to each terminal
Ans b) common to each terminal
c) when all terminals are quiet
*
Continuity of a fibre optic cable is checked by
a) a light source and an opto-power meter
b) a calibrated light source
Ans c) a calibrated light source and an optometer
*
To shield a fibre optic from EMI you must
a) earth both transducer and couplings
b) shield it with a braided shield
Ans c) use an opto-isolator
*
A simbol generator displays ESDs warning. During replacement
a) you must wear a wrist strap connected to an approved earth point
Ans b) make sure the pins are not touched and covers fitted
c) you must earth the unit to the airframe structure
*
Magnetic deflection on a CRT is achieved by a
a) sawtooth waveform
Ans b) trapezoidal waveform
c) sinusoidal waveform
*
An FDR fitted to a helicopter begins recording
a) on take-off
Ans b) on engine start-up
c) when power is applied to the aircraft
*
MIL-ST-1533 is a data bus for
a) Flight Data Recorders
b) Inertial Reference System
Ans c) Digital Information Transfer System
*
Making an invertor from a NAND or NOR gate is achieved by
a) inverting the input
b) connecting two in series
Ans c) connecting the inputs
*
Parallel to series conversion is achieved by
a) a parallel to series converter
Ans b) a shift register
c) a multiplexer / demultiplexer
*
The FMS databases consist of
a) one navigation and one performance database
b) two performance and one navigation database
Ans c) one performance and two navigation databases
*
The FMS can update the IRS position outputs by using information from either
a) VOR and DME only
b) DME and GPS only
Ans c) GPS, DME, LOC and VOR
*
The accepted error from INS/IRS is
a) 1 mile/hour + 3 miles
b) 2 miles per hour + 3 miles
Ans c) 3 miles / hour + 3 miles
*
Before an IRS can complete the alignment sequence
a) the shutdown present position must be entered
Ans b) the current present position must be entered
c) either the last or current position must be entered
*
Within a computer controlled flight system, position feedback is converted from
Ans a) analogue to digital
b) digital to analogue
c) position feedback to rate feedback
*
What shape does the waveform take to counter the impedence effect of the coils in an electromagnetic controlled CRT?
Ans a) Trapezoid
b) Sawtooth
c) Rectangular
*
What warnings can an FMS provide?
Ans a) Discrete warnings
b) Spurious faults
c) Ground faults only.
*
Centralised Aircraft Monitoring System
a) performs in-flight and ground tests of aircraft systems by carrying out a BITE interrogation
Ans b) give red warnings and amber cautions to display system status
c) performs in-flight BITE interrogation only
*
The control of the speed or rate that the flight director command bars move can be controlled by
a) position feedback
Ans b) rate or velocity feedback
c) amplifier gain
*
The Centralised Aircraft Monitoring System uses the maintenance mode of operation
a) in the air only
Ans b) on the ground only
c) either in the air or on the ground
*
The third EFIS Symbol Generator is operated
a) with EICAS
b) in an emergency
Ans c) as a standby to the No1 and No2 system
*
What functions are available on the EHSI?
a) Full arc and Wx only
Ans b) Full arc, Wx and Map Mode
c) Full Arc only
*
EFIS displays of the right hand and left hand displays are compared by comparators in the
a) FMS
b) EICAS
Ans c) Symbol Generators
*
What is the approximate earth rate?
a) 5o/hour
b) 10o/hour
Ans c) 15o/hour
*
An IRS platform has
a) two accelerometers
Ans b) three accelerometers
c) two or three accelerometers depending on the system
*
IRS Laser Ring Gyros provide
Ans a) rate movement about an axis
b) displacement about an axis
c) both rate and displacement about an axis
*
What are the outputs of a Digital ADC?
Ans a) TAS, MACH, Altitude, TAT and SAT
b) TAS, MACH and Altitude
c) TAS, MACH, Altitude and TAT
*
ARINC 629 periodic mode is used for
Ans a) normal operation
b) transferring data only on events important to aircraft operation
c) database loads
*
A fibre optic data bus used on an aircraft
a) connects non-essential systems only
Ans b) can transmit on several channels at the same time
c) can send only one message at a time
*
Light travels along a fibre optic by
Ans a) reflection
b) refraction
c) dispersion
*
Manufacturers of aircraft can ensure HIRF protection by
Ans a) designing specific avionic areas that are shielded against HIRF
b) ensuring all single wires are shielded with metal conduit
c) advising operators of all points susceptible to deterioration due to corrosion, moisture ingress, flexing etc.
*
How is data coupled to an ARINC data bus?
a) By a capacitive pickup
Ans b) By an inductive pickup
c) By a resistive pickup
*
An AND gate output is 1 when inputs are
a) both 0
b) 1 and 0
Ans c) both 1
*
What is hex 110 in decimal
Ans a) 272
b) 282
c) 32
*
Convert the binary word 1100 to decimal
a) 16
Ans b) 12
c) 11
*
How does MIL-STD-1533 put data onto the data bus?
Ans a) Through the bus controller
b) R1 (remote terminal)
c) SSIFU (sub-system interface unit)
*
If a data message is made up of 1 and 0 it is
a) analogue
Ans b) digital
c) logic
*
Convert the binary word 1110 to decimal
a) 12
Ans b) 14
c) 15
*
What sort of gate requires two positive voltages to operate
a) NOT
b) OR
Ans c) AND
*
What is the main disadvantage of a fibre optic data bus?
Ans a) Bend radius and moisture ingress at connections
b) Less strong and durable when compared to twisted pair and coaxial cable
c) Expensive to install
*
When 4 binary serial counters are connected in cascade for frequency division, what division factor is required
a) 4
b) 8
Ans c) 16
*
Magnetic deflection in a CRT is achieved by
a) a sawtooth waveform
Ans b) a trapezoidal waveform
c) a sinusoidal voltage
*
Fly by Wire systems in the fully active mode, the actuators will
a) both be active
Ans b) one in active mode, one in damping mode
c) both be in damping mode, awaiting control inputs
*
The parity bit in digital information is used
a) for BITE programs
Ans b) to check the validity of data information
c) to check the status of the system
*
On a Fly by Wire system, what controls the stab trim
a) ELAC
Ans b) ELAC and SEC
c) SEC
*
A disadvantage of a fibre optic cable is
a) shallow bend radius
b) couplings susceptible to ingress of fluid
Ans c) liable to environmental contamination of end terminals
*
ARINC 429 SDI word format is at bits
a) 1 - 8
Ans b) 9 - 10
c) 32
*
Convert the binary number 110010 to decimal
a) 80
Ans b) 50
c) 34
*
What is serial to parallel and vice-versa called
a) Encoder/Decoder
Ans b) Multiplex/Demultiplex
c) Switching
*
What is the parity bit for on an ARINC 429 bus
Ans a) To check for corruption during transmission of a word
b) To act as a terminal gap in an emergency
c) To delay the signal
*
3 binary counters in cascade. What is the division?
Ans a) 8
b) 16
c) 32
*
Control of software is by
Ans a) the National Aviation Authority
b) engineers
c) the aircraft manufacturers
*
A typical fibre optic connector is
a) F-type connector
Ans b) coupling type, with lens fitted
c) push-pull connector
*
An ARINC 429 word label format is
a) binary
Ans b) octal
c) hexadecimal
*
Which of the following is an optelectronic device?
a) Triac
b) Thyristor
Ans c) Laser Diode
*
What is the advantage of a single mode fibre optic over ordinary wire?
Ans a) Large bandwidth
b) Small bend radius
c) Not prone to damage
*
How many LRUs can be connected to an ARINC 429 data bus
a) 120
Ans b) 20
c) 60
*
Convert the hexidecimal number D into decimal
Ans a) 13
b) 14
c) 15
*
Convert decimal 15 into binary
a) 1101
Ans b) 1111
c) 1110
*
Convert 448 to hex
a) 3616
Ans b) 2416
c) 2216
*
When will a NAND gate give logic 0 at the output?
a) When both inputs are at 0
Ans b) When both inputs are at 1
c) When the inputs are different
*
How many LRUs can be connected to an ARINC 629 data bus
Ans a) 120
b) 20
c) 60
*
Convert decimal 15 into hexadecimal
a) E
b) G
Ans c) F
*
Which logic gate has this truth table A B C
C
|
B
|
A
|
0
|
0
|
0
|
1
|
1
|
0
|
1
|
0
|
1
|
0
|
1
|
1
|
a) NOT
Ans b) Exclusive OR
c) NAND
*
Which logic gate can be represented as a parallel circuit?
Ans a) OR
b) Exclusive OR
c) NAND
*
What is the definition of level one software?
Ans a) Critical
b) Essential
c) Non-essential
*
ESDS bags are sealed by
a) zip locks
b) ESDS labels
Ans c) twine (100% cotton)
*
What is 345 in binary?
Ans a) 101011001
b) 110011001
c) 100111001
*
What are the values of an ESDS wrist strap?
a) 250 kilohms to 1.5 megohms
Ans b) 2 megohms to 5 megohms
c) 2 gigohms to 4 gigohms
*
Convert 1D to binary
a) 29
Ans b) 11101
c) 101001
*
ARINC 629 terminal transmit interval is
a) unique to each terminal
Ans b) common to each terminal
c) is when all transmissions are quiet
*
Convert 2C hex to octal
Ans a) 54
b) 44
c) 35
*
A fibre optic light source is normally
a) a filament lamp
Ans b) a laser or LED
c) a strobe light
*
What precautions are required when removing ESDS equipment
Ans a) Wear a wrist strap connected to an approved ground point
b) Keep one hand on the airframe
c) No special precautions are required
*
An ARINC 429 bus uses
a) two bi-directional twin, sheathed and earthed wires
Ans b) a twisted shielded pair of wires
c) a single twin cable for each transmitter
*
The minimum requirement for a cockpit voice recorder to begin operating is
a) on engine startup
Ans b) on commencing the takeoff roll
c) once established in the en-route climb
*
An FMS system, besides controlling navigation, thrust and auto-nav, also provides
a) take-off and landing warnings
Ans b) dedicated status and warnings
c) GPWS warnings
*
EADI sky and ground display is provided by
a) synthetic TV signals
Ans b) raster scan
c) stroke pulse
*
HSI heading is valid if the heading flag is
a) in view
b) green
Ans c) out of view
*
A NOR gate with both inputs inverted becomes a
a) NAND gate
Ans b) AND gate
c) OR gate
*
An ARINC 429 binary coded decimal data word occupies bits
a) 11 to 28
Ans b) 11 to 29
c) 1 to 8
*
A fibre optic cable consists of
a) a plastic core with a cladding having a higher refractive index
b) a silica glass core with a cladding having a higher refractive index
Ans c) a silica glass core with a cladding having a lower refractive index
*
The command bars on an ADI relate to
Ans a) path required
b) path being followed
c) roll indications
*
The recording medium in an FDR is
a) a high density floppy disc
Ans b) plastic tape coated with ferrite
c) copper foil coated with ferrite
*
Convert 0111012 to octal
a) 25
b) 33
Ans c) 35
*
What does the CADC feed
a) Altimeter / FMS / secondary radar
b) standby altimeter / machmeter
Ans c) cabin pressure controller sensor / machmeter / altimeter
*
ARINC 629 databus is
a) one cable, bi-directional
Ans b) two cables, bi directional
c) two cables, uni-directional
*
Requirements for software control can be found in
Ans a) AWN 45
b) JAR OPS
c) JAR AWO
*
Software can be modified by
a) licensed avionics engineers
b) the manufacturer
Ans c) The same rules apply as to modifications to hardware
*
Two connected fibre optic cable ends are parallel but not quite touching. This is called
a) lens connector
Ans b) end to end coupling
c) end fire coupling
*
A disadvantage of a fibre optic cable is
a) shallow bend radius allowed
b) couplings susceptible to ingress of fluid
Ans c) end terminals are susceptible to environmental contamination
*
The inside of a CRT consists of
a) an oxide coating and rare mercury gas
Ans b) a phosphor coating and rare mercury gas
c) iodine and rare mercury gas
*
What kind of light is used in a fibre optic systems?
Ans a) Infrared
b) Visible
c) Ultraviolet
*
Typical displays on an EHSI are
Ans a) VOR, Map, Plan and weather radar
b) VOR, Plan, Map and Attitude
c) Engine indications
*
An EADI display showing a moving runway moves down during the final stages of an approach. The aircraft must
a) fly up
Ans b) fly down
c) hold descent path
*
An ARINC 573 data bus is used
Ans a) to input into a Digital Flight Data Recorder
b) to input into a FDR Digital Acquisition Unit
c) to supply digital inputs from a Symbol Generator to the EADI and EHSI
*
A flight data recorder can obtain information from aircraft instruments
Ans a) provided there is adequate isolation
b) by direct connection to the instruments
c) provided there is adequate damping
*
Adding invertors to the two inputs of an AND gate makes a
a) NAND gate
b) OR gate
Ans c) NOR gate
*
An ARINC 429 bus uses
Ans a) a twisted shielded pair of wires
b) two bi-directional twin sheathed and earthed wires
c) a single twin wire cable for each transmitter
*
CRT horizontal beam control is achieved by a
a) square wave
Ans b) sawtooth wave
c) sinusoidal wave
*
The ARINC 429 data bus word systems use
a) decimal numbering
b) hexadecimal numbering
Ans c) binary coded decimal
*
The binary number 11010111 expressed as a decimal is
a) 207
b) 223
Ans c) 215
*
The octal number 1001 expressed as a decimal is
a) 65
Ans b) 513
c) 9
*
This truth table is for a
C
|
B
|
A
|
0
|
0
|
0
|
0
|
0
|
1
|
0
|
1
|
0
|
1
|
1
|
1
|
a) NAND gate
Ans b) AND gate
c) OR gate
*
The inputs and outputs of a CADC are
a) pitot and static in; altitude, attitude, IAS and VS out
Ans b) pitot and static in; altitude, IAS, mach and VS out
c) pitot in; static, altitude, mach, IAS and VS out
*
EICAS provides the following
a) engine parameters only
Ans b) engine parameters and system warnings only
c) engine parameters and engine warnings only
*
During an instrument approach, the glideslope pointer deflects below the glideslope centre mark. This means the aircraft is positioned
Ans a) above the glideslope
b) below the glideslope
c) to the left of the localiser
*
Engine parameters are displayed on
Ans a) ECAM
b) EHSI
c) FMSCDU
*
A central maintenance computer provides
Ans a) ground and flight monitoring and testing on an on-board computer
b) ground and BITE testing using a portable control panel
c) display of system warnings and cautions
*
ARINC 573 is related to what system
a) INS
Ans b) FDR
c) Weather Radar
*
The rising runway is positioned from information derived from
a) barometric height
b) vertical speed
Ans c) radio altimeter
*
Where are the Digital Flight Data Recorder outputs supplied to?
a) The recording unit
b) Flight instruments
Ans c) There are no outputs
*
FMS failure and warnings are
Ans a) displayed on EICAS
b) engine warnings only
c) EFIS warnings only
*
Who is responsible for the operational program of the FMS?
Ans a) The pilot
b) The engineer
c) The manufacturer
*
Flight director command bars are moved to the correct position by
Ans a) position feedback
b) amplifier gain
c) calibration
*
If a signal has quantity in volts and physical position it is
a) digital
b) synchronous
Ans c) analogue
*
In a CRT, if the magnetic field is parallel to the Y plates, what will be the direction of the electron beam movement?
Ans a) Vertical
b) No movement
c) Horizontal
*
What is the fixed feature of an ADI?
a) The glideslope pointer
b) The lateral deviation bar
Ans c) The aircraft symbol
*
Primary colours of a CRT are
Ans a) red, green and blue
b) red, green and yellow
c) red, blue and yellow
*
What information is required before completion of the alignment of an Inertial Navigation System?
Ans a) Aircraft present position
b) Aircraft present position and heading
c) Heading and attitude
*
IRS accelerometers are mounted
a) 60o to each other
b) 45o to each other
Ans c) 90o to each other
*
An FMS navigation database is updated
a) at the operators request
b) once a month
Ans c) every 28 days
*
A single failure of a fly-by-wire system
Ans a) has no effect on aircraft operation
b) will limit the flight profile
c) will reduce operational heights and speeds
*
Fly-by-wire load alleviation function in turbulent conditions will result in
a) ailerons moving symmetrically upwards
Ans b) ailerons and spoilers moving symmetrically upwards
c) spoilers moving symmetrically upwards
*
Fly-by-wire roll control is achieved by
a) ailerons
b) spoilers
Ans c) spoilers and ailerons
*
The movement of fly-by-wire control surfaces are
a) hydraulically controlled and electrically actuated
b) both electrically controlled and electrically actuated
Ans c) electrically controlled and hydraulically actuated
*
ARINC 629 current mode couplers are
a) capacitive
b) resistive
Ans c) inductive
*
On an EADI, the Flight Director command bars show
a) the actual path with respect to the required path
Ans b) the required path with respect to the actual path
c) the path with respect to the horizon
*
What instrument includes a display of a rising runway?
Ans a) EADI
b) EHSI
c) ECAM
*
What are the effects of the X and Y plates on a CRT?
a) X plates move the beam vertically, Y plates move the beam horizontal
Ans b) Y plates move the beam vertically, X plates move the beam horizontal
c) X and Y plates can move the beam in either direction
*
ARINC 629 data bus is
a) two buses, unidirectional
b) two buses, bi-directional data flow
Ans c) one bus, bi-directional data flow
*
An FMS system, besides controlling navigation, thrust and auto-nav, also provides
a) take-off and landing warnings
Ans b) dedicated status warnings
c) GPWS warnings
*
In order to maintain HIRF protection, bonding checks between airframe and electrical components carrying voltages greater than 50 volts RMS or DC or main earth return should not exceed
a) 1 megohm
Ans b) 1 ohm
c) 0.05 ohm
*
Ribbon cables effected by mutual impedance and current loop leakage should be protected by
a) shielding each individual conductor
b) connecting all conductors to a common earth
Ans c) earthing each alternative conductor to separate point
*
EADI sky and ground display is provided by
a) synthetic TV signals
Ans b) raster scan
c) stroke pulse
*
Normal transmission order of ARINC 629 LRUs in periodic mode is in order of
Ans a) power up
b) shortest to largest TG
c) shortest to largest TI
***
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