AME EXAM PAPER 3 - JET ENGINE QUE
PAPER 3
1) At the induction process points at which ram pressure is equal to friction pressure loss
a) Pressure loss point
b) Ram recovery point
c) Total pressure recovery point
d) Compressor total recovery point
2) In axial flow compressor velocity is maintained near constant level which is achieved by
a) Gradual reduction of annulus area from the front to rear of compressor
b) Aerofoil compression of rotor & stator blades arrange axially maintained the rear
c) The relatively small rise of pr ratio to each stage
d) By designing multiple stage axial compressor with control air velocity
3) what is specific fuel consumption
a) A ratio between fuel flow ( lbs/hr ) & power developed by engine (lbs)
b) A ratio between fuel flow & thrust of the engine
c) Consumption of fuel flow per hr at cruising speed of aircraft
d) All
4) the purpose of the bleed valve in to middle or rear of the compressor is
a) To bleed air & increase airflow in the front of compressor at lower engine speed
b) To bleed excess volume of air overboard & prevent stalling of compressor
c) Vent high ram air pressure overboard to prevent the compressor stall
d) Both 1 & 2 are correct
5) ceramic coated tiles are used on the interior wall of the many combustor
1. To protect combustor side walls from temp & corrosion
2. To aid cooling of the of the flame tube
3. To give a strength to the combustor wall
4. To prevent a region of stagnant fuel from occurring
6) in which types of turbine the pressure drop across each stage occurs in fixed NGV which because of its convergent shape increases the gas velocity while reducing the pressure
a) Impulse
b) Reaction
c) Impulse reaction
d) None
7) aerodynamically turbine blades have flat curve in their operation for
a) Simplicity design process of watching turbine compressor
b) To produce rated thrust at all condition
c) Designing process is easy
8) Which engine vibration monitoring sensor is easy to install & require simple processing
a) Velocity pickups
b) Piezoelectric accelerometer
c) Piezo resistive accelerometer
d) Dynamometer
9) which instrument reading shows, how hard the engine is working
a) EPR, N2 & N1
b) EPR, EGT, fuel flow & N2
c) EGT, fuel flow & N2
d) All of the above
10) in modern aeroengine FADEC system is powered by
a) A/C main electrical system
b) A/C engine driven 36V AC generator
c) A/C 135 AC alternator
d) A dedicated engine driven generator
11) what is the disadvantage of full flow oil system in GTE
a) More oil capacity as well as consumption
b) One temp rise is more hence additional cooling is required
c) All bearing chamber are unequally pressurized hence impact on the scavenge pump sizing
d) All are correct
12) additive used in GTE
a) Fungicide
b) Anti-oxidising agent, de-metal anticorrosive agent
c) De-icing additives
d) All of the above
13) the function of PRSOV in the engine fuel system
a) Located upstream of metering valve to maintain minimum pressure required for engine demand
b) Shut of fuel in case of high pr & send through bypass valve
c) Located downstream of metering valve to maintain HP pump pressure rise at low flow
d) To shut off the positive flow to serve power system hence raising the pr to min required to line as per engine demand
14) a source of hydraulic power to actuate control system variable in GTE is
a) A/C hydraulic system
b) Engine driven hydraulic pump
c) A/C oil system
d) A/C fuel system
15) Impulse turbine
a) All the pressure is converted to velocity
b) Inlet area is equal to outlet area & all pressure is converted to velocity
c) The parallel force act along the center line of shaft & is taken by the thrust bearing
16) the component housed in intermediate case are
a) LP compressor, main shaft, thrust bearing, struts, vanes
b) Intermediate compressor, main shaft thrust bearing, struts
c) Main shaft thrust bearing, struts, internal gearbox, bevel drive shaft
d) LP compressor, main shaft thrust bearing, struts, IGB, bevel gear drive shaft#
17) Propulsive efficiency
a) Work completed/work wasted by exhaust
b) Work completed/work wasted by exhaust + work completed
c) Work wasted + work completed/ work completed
d) Work wasted/ work completed
18) Ram drag
a) Loss in thrust from exhaust
b) Loss in thrust while taking the air from the front of engine
c) Loss in gross thrust produced at sea level
19) Compressor wash is done for
a) To remove dirt deposited on the compressor
b) To remove contamination of dust with oil
c) Remove dirt & dust
d) All are correct
20) Removal of flame tube will allow inspection of
a) NGV
b) Low pressure turbine
c) High pressure turbine
d) Both 1 & 3
21) which of the following statement is correct regarding operating mechanism of instrument system
Vibration EGT FF Speed
(Accelerometer) (Thermocouple) (Transducer) (Motor/generator)
a) Voltage current frequency DC pulse
b) Charge EMF DC pulse frequency
c) Current DC pulse EMF current
d) Charge EMF frequency DC pulse
Q22) MTCS
a) Temp drop across the turbine is same as the temp rise through compressor
b) Temp drop through the turbine is greater than the temp rise through compressor
c) Both 1 & 2
23) Advantage of using free turbine
a) Propeller can be held at very high rpm during taxing
b) The propeller & its gearbox doesn’t directly transmit vibration to the gas generator
c) The propeller can be directly connected to free turbine
d) All are correct
Q24) which of the following decides the stall characteristics of GTE
a) Compressor speed & velocity of air
b) Compressor pressure ratio
c) Compressor efficiency
Q25) inspection of cracks & heat damage to flame tube is possible in
a) Annular type combustion chamber
b) Can type combustion
c) Can annular combustion chamber
d) Reverse flow
Q26) excessive blade tip speed
a) High blade efficiency, fluttering & less vibration
b) Poor blade efficiency, fluttering & vibration
c) High blade efficiency & fluttering
Q27) Aerodynamic unbalance in propeller
a) Equal thrust at differing contour setting
b) Unequal thrust at different contour & blade angle setting
c) Unequal thrust at same blade angle & different contour
Q28) delta P light is used in
a) Oil system
b) Fuel system
c) Hydraulic system
d) Bleed system
Q29) hot section inspection are carried out
a) To check the integrity of hot section parts
b) To check compressor blade, combustion chamber, turbine
c) Carried out according, to maintenance planning document
d) All are correct
30) Position measurement sensors are
a) LVDT
b) RVDT
c) Resolver
d) All
Q31) Fan blade shingling occurs due to
1. Over speed 2. Over temp 3. ........ 4. FOD
a) 1 & 4
b) 1,2,3 & 4
c) 3 & 4
Q32) mark the incorrect statement
a) Propeller brake is used to stop will milling of feathered propeller & reduce time for propeller to come rest at engine shut down
b) NTS system design to prevent excessive propeller
c) TSS a device which will provide manual feathering when around during takeoff
d) Safety coupling is a safety device breaking up NTS system
Q33) when a GTE which is operating at high throttle setting is suddenly shut down giving proper cooling time
a) Combustion chamber cracking may occur
b) Turbine blade crack due to the rapid cooling
c) Both 1 & 2
d) Turbine blade may squeal & seize
Q34) lean die out
a) High fuel PR, low engine speed , high altitude
b) Low fuel pr, high engine speed, low altitude
c) Low fuel pr, low engine speed, high altitude
Q35) engine vibrates throughout rpm but indicated amplitude reduces as rpm reduces
a) Fuel control malfunction
b) Bleed air valve malfunction
c) Turbine damage
Q36) while inspecting the hot section of the GTE, the damage parts are marked using
a) Layout die
b) Commercial felt tip marker
c) Grease pencil
d) Chalk
e) Graphite pencil
1. a, b, c, d 2. a, b, d 3.b,d,e 4.a, b, d, e
Q38) in GTE shut down in case of rotor over speed is done through
a) Shut down fuel supply by switch in cockpit
b) Shut off fuel supply by PRSOV on command by EEC
c) A command by engine independent over speed protection
d) All are correct
Q39) which of the following works on the principle of self ionization
a) Annular gap
b) Constrained gap
c) Glow plug
d) None
Q40) MTCS trim curve in turbine is maintained during field trimming
a) Up trim to compensated the thrust due to bleed air loss
b) To compensate the thrust due to contamination of compressor blade
c) Both 1 & 2
d) Down trim to compensate the thrust due to bleed air lost
Q41) MTCS regarding last chance filter
a) To prevent damage to the oil jet
b) Filter oil immediately before bearing
c) Prevent foaming
Q42) MTCS
a) Starter generator has 2 separate armature
b) Starter generator has 2 field windings, series field winding is used for high starting torque & shunt field winding for generator
c) Starter generator has 3 connection ( a series field connection, B armature connection, shunted field
d) All
Q43) while starting the GTE the EGT crosses its max limit but still under control
a) Engine is send for overhaul
b) Engine is to be replaced
c) Boroscopic inspection called for
Q44) when an engine is flat rated to 29deg C then
a) Thrust increases till 290C
b) Engine gives specified rated thrust till 290 C
c) Thrust decreases till 290C
d) As in 1 and thrust will be maximum at 290 C
Q45) ACC
a) Decrease clearance bet blade & casing by cooling the casing
b) Prevent compressor stall
c)
Q46) cooling process in which air flows from small exit ports in leading & trailing edges
a) Convectional
b) surface film cooling
c) combination of film & convection
d) all
Q47) stress rupture cracks
a) occur along the length of the blade
b) occurs along the LE & TE at right angle to the blade edge
Q48) EPR
a) is an indication of thrust
b) modification of turbine discharge pressure
c) ratio of intake air pr to atm pr
Q49) which of the fire detector require heat for normal testing
a) lindsberg & thermocouple
b) fenwall & kidde
c) continuous element
Q50) torque meter senses
a) HP pressure
b) Oil fluctuation
c) Sense the axial movement of the pinion of reduction gear
Q51) Beta range is used
a) At ground to produce zero to negative torque
b) For flight idle to takeoff
c) For less fuel consumption on ground operation
Q52) in some turbofan engine, high bypass, the thrust reverser is placed in cold stream
a) Blocker doors are used
b) As in 1 & cascade vanes are used for reversal
c) As in 2 & also translating sleeve is used
d) As in 3 & the core gases are allowed to give thrust in forward direction
Q53) on modern engine the monitoring of oil is done by electronic magnetic chip detector which operates on the principle of
a) .....
b) Bridging the gap between centre electrode & ground electrode
Q54) mechanical integrity of an engine check is
a) Fuel flow
b) EPR
c) EGT
d) Vibration
Q55) Given for an engine HP = 1000 thrust produced = 250lbs, & SFC = 0.6/ESHP/lbs , then calculate the fuel consumption /hr
a) 850
b) 700
c) 660
d) 750
Q56) recuperator
a) ....
b) ....
c) To return some of the heat energy that would normally be lost with the exhaust
Q57) purpose of tail pipe
a) To remove the exhaust gases from the airframe
b) As in 1 & it produces performance loss due to duct losses
c) As in 2 & it exhaust the gas from front of the airframe
d) All are wrong
Q58) APU de icing
a) From ram air
b) Bleed air from APU
c) Bleed air from one of the engine compressor
Q59) Starting sequence
1. ensure the availability of air supply
2. set the throttle at idle
3. switch on the electrical power
4. turn the booster pump on
5. .....
6.....
a) 1,2,3,4,56,
b) 1,3,4,5,1,6
c) 2,4,5,6,3,1
Q60) Auto ignition
a) Ensure instantaneous ignition if an engine begins to lose power from icing
b) Stand by protection in case of flameout
c) ....
Q61) which of the following valve is used to direct oil outboard & inboard in propeller pitch control
a) Speeder spring
b) Pilot valve
c) Flyweight
Q62) Most modern engine fuel control meters fuel by
a) Keeping the pr drop or differential across the metering valve constant while varying the size of orifice
b) Keeping the valve orifice constant & varying pr drop
c) Keeping both the pr drop & valve orifice constant
d) Varying both valve orifice & pr drop
Q63) which of the following factors affects the thrust the most
a) Ambient temperature
b) Density
c) Compressor efficiency
d) Turbine efficiency
Q64) oil pressure indicating system uses
a) Thermocouple measuring system
b) Autosyn measuring system
c) Resistance bulb measuring system
d) All of the above
Q65) motor less mass flow meter utilises a system which has a operating principle of
a) Vane is moved against the spring and transmitter moves along with the vane
b) ……….
c) Transmitter converts flow rate into 2 electronic signals and measures mass flow
Q66) MTCS
a) If the FADEC (EEC) is removed from the aircraft the EEC programming plug must remain with the engine
b) If the engine is started without the eec programming plug installed fadec (eec) goes into failsafe mode
c) If the fadec gets disconnect in flight, fadec (eec) goes into N1 mode
Q67) water injection at combustion inlet
a) Increases mass flow across whole engine
b) Drops pressure and temperature across the turbine resulting in increased pressure at the jet pipe
c) Water injection at the combustor increases engine life
d) All
Q68) in an propeller pitch control when oil is directed against the chamber the propeller will go to
a) Low pitch rotation
b) High pitch rotation
c) Remains the same
d) Low rpm
Q69) in turbofan engine, fan has
a) Same principle as in turboprop
b) Increase in thrust without increase in fuel flow
c) Sometimes fan is located aft of the turbine wheel
d) All
Q70) ignition system wiring is checked for
a) Safety, security and fluid contamination
b) Cracks and discontinuity
c) Damage to the protective sheath
d) All
Q71) oil temp indication is taken from
a) Oil tank
b) Outlet of the main pump
c) Inlet of the main pump
d) Combined scavenge line
Q72) for a given hot ay condition the N2 parameter of the engine is corrected for
a) No need of any correction
b) N2 corrected=N observed / Öobserved temperature at 5190 Rankine
c) N2 corrected=N observed / Öambient temperature at 5190 Rankine
d) N2 corrected=N observed / Öobserved pressure at 29.920 of Hg
Q73) when the engine is in test cell/bed which of the following parameters is to be observed
a) Oil pressure, EGT, EPR, and any malfunction
b) ……………
c) ……………
d) ………………..
Q74) which of the following instruments is to be measured to monitor for operation of APU
a) Oil pressure
b) Oil temp.
c) EGT
d) All are correct
Q75) to ensure proper lubrication of the gears before starting the engine
a) Small amt of oil caught in the trough after shut down
b) Silver plating of the gears
c) Both are correct
d) None
Q76) when a/c speed increases
a) Thrust decreases
b) Thrust increases
c) Thrust remains the same
d) Thrust decreases but is compensated by the ram effect
Q77) when starting the GTE, if it fails to reach the self-accelerating speed, but EGT is below 7600F,
and then it is
a) hot start
b) false start
c) aborted start
d) no start
Q78) in GTE, the ignition system is rated in
a) Electrical charge (ampere)
b) Electrical energy (joules)
c) Power (watts)
d) None
Q79) APU operation and condition can be carried out by
a) Continues monitoring
b) By following standard maintenance practices
c) APU can be left operated for prolonged time period
d) Both a and b
Q80) for operation of APU the master control switch should be in “OFF” or “STOP” position
a) APU doesn’t reach the governed speed
b) Light up do not occur
c) Abnormal noise
d) All
Q81) engine operating in a high power setting is suddenly shut down by closing the shutoff valve, now if the AME wishes to restart the engine the
a) AME can start the engine by opening the shut off valve immediately after the shut down
b) AME should not start the engine as there will be chance of turbine damage due to thermal stress
c) AME should not start the engine so as to avoid the compressor stall
Q82) for proper operation of a GTE the lubricating oil is required to have
a) High viscosity index
b) Low viscosity index
c) High acidic characteristic
d) High pour point
Q83) in the magnetic chip detector the metal detector gives bright green colour when reacted with nitric acid then the probable metal is
a) Copper and bronze
b) Aluminium
c) Magnesium
d) Titanium
Q84) VSV serves as stall preventive characteristics by
a) Reducing airflows at low speed
b) Reducing airflow at high speed
c) Increasing airflow at low speed
Q85) MTCS
a) TSS actuates the propeller feather lever
b) NTS reduces propeller drag
c) TSS actuates the propeller lever when engine fails during staring or take off
Q86) blending means
a) Contouring the blade
b) Cutting the blade
c) Replacement of the blade
d) None
Q87) fuel or oil fire is classified as
a) Class a
b) Class b
c) Class c
Q88) primary purpose of reversible pitch propeller is
a) Reduce the long landing roll
b) To use the full power lever operation during flight
c) ……………
d) ……………
Q89) prime factors affecting engine performance are
a) Propulsive efficiency
b) Thermal efficiency
c) Overall efficiency
d) All
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