DGCA & EASA Module 15 : Part-17 Engine Fire Protection System Question
DGCA & EASA Module 15 : Part-17 Engine Fire Protection System Question-Answer
1. A fire wire is installed.
A. to withstand inertia, vibration, etc, encountered during normal operation.
B. vertically.
C. horizontally.
Ans : to withstand inertia, vibration, etc, encountered during normal operation.
Explanation: Firewires can be any shape or position, retained in rubber clips.
2. Resistive and capacitive type firewires are tested with.
A. megger/voltmeter.
B. megger/ohmmeter.
C. multimeter.
Ans : megger/ohmmeter.
Explanation: Jepperson A&P Powerplant Page 11-11 refers.
3. Fire wire clips have rubber in them to.
A. stop heat transfer to the element.
B. insulate the fire wire electrically.
C. support the wire.
Ans : support the wire.
Explanation: Jepperson A&P Powerplant Page 11-9 refers.
4. Fire extinguishers work by.
A. combining with remaining oxygen to get rid of it.
B. creating more oxygen.
C. reducing oxygen.
Ans : combining with remaining oxygen to get rid of it.
Explanation: Jepperson Gas Turbine Powerplants Page 13-6 refers (Halon 1211).
5. Fire detection systems which are routed through another zone.
A. must be protected by the use of heat sinks.
B. must be protected from heat sources in the zone.
C. are not allowed.
Ans : must be protected from heat sources in the zone.
Explanation: JAR 25.1203 states that a fire detection device must not pass through another zone unless it is protected from the heat of that zone.
6. The test switch of a continuous loop detector gives a.
A. continuity check.
B. insulation check.
C. bonding check.
Ans : continuity check.
Explanation: Jepperson Gas Turbine Powerplant Page 13-3.
7. What are the types of continuous fire detection system?.
A. Capacitance.
B. Capacitance and resistance.
C. Inductance and capacitance.
Ans : Capacitance and resistance.
Explanation: Jepperson Gas Turbine Powerplant Page 13-3.
8. What is the operating principle of the spot detector sensor in a fire detection system?.
A. A conventional thermocouple that produces a current flow.
B. A bimetallic thermoswitch that closes when heatedto a high temperature.
C. Resistant core material that prevents current flow at normal temperatures.
Ans : A bimetallic thermoswitch that closes when heatedto a high temperature.
Explanation: Jeppesen A&P Powerplant Textbook 11-2.
9. In a fixed fire-extinguishing system, there are two small lines running from the system and exiting overboard. These line exit ports are covered with a blowout type indicator disc. Which of the following statements is true?.
A. When the red indicator disc is missing, it indicates the fire extinguishing system has been normally discharged.
B. When the green indicator disc is missing, it indicates the fire extinguishing system has had a thermal discharge.
C. When the yellow indicator disc is missing, it indicates the fire extinguishing system has been normally discharged.
Ans : When the yellow indicator disc is missing, it indicates the fire extinguishing system has been normally discharged.
Explanation: NIL.
10. Two continuous-loop fire detection systems that will not test due to a brokendetector element are the.
A. thermocouple system and the Lindberg system.
B. Kidde system and the Fenwal system.
C. Kidde system and the Lindberg system.
Ans : Kidde system and the Fenwal system.
Explanation: Jeppesen A&P Powerplant Textbook 16-15.
11. Which of the following fire detection systems measures temperature rise compared to a reference temperature?.
A. Lindberg continuous element.
B. Thermocouple.
C. Thermal switch.
Ans : Thermocouple.
Explanation: Jeppesen A&P Powerplant Textbook 11-4.
12. A fire involving energized electrical equipment is defined as a.
A. class B fire.
B. class D fire.
C. class C fire.
Ans : class C fire.
Explanation: NIL.
13. How are most aircraft turbine engine fire extinguishing systems activated?.
A. Manual remote control valve.
B. Pushrod assembly.
C. Electrically discharged cartridges.
Ans : Electrically discharged cartridges.
Explanation: NIL.
14. A fire detection system that operates on the rate of temperature rise is a.
A. thermocouple system.
B. thermal switch system.
C. continuous loop system.
Ans : thermocouple system.
Explanation: NIL.
15. Why does one type of Fenwal fire detection system use spot detectors wired in parallel between two separate circuits?.
A. So that a single fault may exist in the system without sounding a false alarm.
B. To provide an installation that is equal to two separate systems: a primary system and a secondary, or back-up system.
C. So that a double fault may exist in the system without sounding a false alarm.
Ans : So that a single fault may exist in the system without sounding a false alarm.
Explanation: NIL.
16. How does carbon dioxide (CO2) extinguish an aircraft engine fire?.
A. By lowering the temperature to a point where combustion will not take place.
B. The high pressure spray lowers the temperature and blows out the fire.
C. Contact with the air converts the liquid into snow and gas which smothers the flame.
Ans : Contact with the air converts the liquid into snow and gas which smothers the flame.
Explanation: NIL.
17. A fuel or oil fire is defined as a.
A. class B fire.
B. class C fire.
C. class A fire.
Ans : class B fire.
Explanation: NIL.
18. Which of the following is the safest fire extinguishing agent to use from a standpoint of toxicity and corrosion hazards?
A. Bromotrifluoromethane (Halon 1301).
B. Bromochlorodifluoromethane (Halon 1211).
C. Dibromodifluoromethane (Halon 1202).
Ans : Bromotrifluoromethane (Halon 1301).
Explanation: NIL.
19. The explosive cartridge in the discharge valve of a fire extinguisher container is.
A. not a life dated unit.
B. a life dated unit.
C. mechanically fired.
Ans : a life dated unit.
Explanation: Jeppesen A&P Technician Airframe Textbook 16-22.
20. A fire detection system operates on the principle of a buildup of gas pressure within a tube proportional to temperature. Which of the following systems does this statement define?.
A. Thermal switch system.
B. Lindberg continuous element system.
C. Kidde continuous loop system.
Ans : Lindberg continuous element system.
Explanation: Jeppesen A&P Technician Powerplant Textbook 11-16.
21. The most satisfactory extinguishing agent for an intake fire is.
A. methyl bromide.
B. dry chemical.
C. carbon dioxide.
Ans : dry chemical.
Explanation: Jeppesen A&P Technician Propulsion Textbook 16-22.
22. How is the fire extinguishing agent distributed in the engine section?.
A. Spray nozzles and perforated tubing.
B. Spray nozzles and fluid pumps.
C. Nitrogen pressure and slinger rings.
Ans : Spray nozzles and perforated tubing.
Explanation: Jeppesen A&P Technician Propulsion Textbook 16-22.
23. What is the principle of operation of the continuous loop fire detector system sensor?.
A. Core resistance material which prevents current flow at normal temperatures.
B. A bimetallic thermoswitch which closes when heated to a high temperature.
C. Fuse material which melts at high temperatures.
Ans : Core resistance material which prevents current flow at normal temperatures.
Explanation: Jeppesen A&P Technician Propulsion Textbook 11-5.
24. The fire detection system that uses a single wire surrounded by a continuous string of ceramic beads in a tube is the.
A. Kidde system.
B. thermocouple system.
C. Fenwal system.
Ans : Fenwal system.
Explanation: Jeppesen A&P Technician Propulsion Textbook 11-5.
25. The fire detection system that uses two wires imbedded in a ceramic core within a tube is the.
A. Lindberg system.
B. Kidde system.
C. Fenwal system.
Ans : Kidde system.
Explanation: Jeppesen A&P Technician Propulsion Textbook 11-5.
26. A continuous loop fire detector is what type of detector?.
A. Rate of temperature rise detector.
B. Spot detector.
C. Overheat detector.
Ans : Overheat detector.
Explanation: Jeppesen A&P Technician Propulsion Textbook 11-5.
27. Which of the following fire detection systems will detect a fire when an element is inoperative but will not test when the test circuit is energized?.
A. The Kidde system and the Fenwal system.
B. The thermocouple system and the Lindberg system.
C. The Kidde system and the thermocouple system.
Ans : The Kidde system and the Fenwal system.
Explanation: Jeppesen A&P Technician Propulsion Textbook 11-5.
28. After a fire is extinguished, or overheat condition removed in aircraft equipped with a Systron-Donner fire detector, the detection system.
A. must be manually reset.
B. automatically resets.
C. sensing component must be replaced.
Ans : automatically resets.
Explanation: Jeppesen A&P Technician Propulsion Textbook 11-7.
29. For fire detection and extinguishing purposes, aircraft powerplant areas are divided into fire zones based on.
A. the volume and smoothness of the airflow through enginecompartments.
B. engine type and size.
C. hot and cold sections of the engine.
Ans : hot and cold sections of the engine.
Explanation: NIL.
30. What is the function of a fire detection system?.
A. To discharge the powerplant fire extinguishing system at the origin of the fire.
B. To activate a warning device in the event of a powerplant fire.
C. To identify the location of a powerplant fire.
Ans : To activate a warning device in the event of a powerplant fire.
Explanation: NIL.
31. What retains the nitrogen charge and fire extinguishing agent in a high rate of discharge (HRD) container?.
A. Pressure gauge and cartridge.
B. Breakable disk or fusible disk.
C. Pressure switch and check tee valve.
Ans : Breakable disk or fusible disk.
Explanation: Jeppesen A&P Technician Propulsion Textbook 11-15.
32. The use of water on class D fires.
A. will cause the fire to burn more violently and can cause explosions.
B. has no effect.
C. is most effective if sprayed in a fine mist.
Ans : will cause the fire to burn more violently and can cause explosions.
Explanation: Jeppesen A&P Technician Propulsion Textbook 11-12.
33. The pulling out (or down) of an illuminated fire handle in a typical large jet aircraft fire protection system commonly accomplishes what events?.
A. Closes fuel shutoff, closes hydraulic shutoff, disconnects the generator field, and arms the fire extinguishing system.
B. Closes fuel shutoff, closes hydraulic shutoff, closes the oxygen shutoff, disconnects the generator field, and arms the fire-extinguishing system.
C. Closes all firewall shutoff valves, disconnects the generator, and discharges a fire bottle.
Ans : Closes fuel shutoff, closes hydraulic shutoff, disconnects the generator field, and arms the fire extinguishing system.
Explanation: NIL.
34. The most satisfactory extinguishing agent for an electrical fire is.
A. carbon tetrachloride.
B. methyl bromide.
C. carbon dioxide.
Ans : carbon dioxide.
Explanation: Jeppesen A&P Technician Propulsion Textbook 11-13
35. Which of the following fire detectors are commonly used in the power section of an engine nacelle?.
A. Rate of temperature rise detectors.
B. CO detectors.
C. Smoke detectors.
Ans : Rate of temperature rise detectors.
Explanation: Jeppesen A&P Technician Propulsion Textbook 11-3.
36. Which of the following fire detection systems uses heat in the normal testing of the system?.
A. The Kidde system and the Fenwal system.
B. The thermocouple system and the Lindberg system.
C. The thermocouple system and the Fenwal system.
Ans : The thermocouple system and the Lindberg system.
Explanation: Jeppesen A&P Technician Propulsion Textbook 11-5.
37. How are extinguisher spray rings checked for freedom from obstruction?.
A. Firing the system.
B. Blowing through with compressed air.
C. Pumping water through the system.
Ans : Blowing through with compressed air.
Explanation: Answer a is the only reasonable answer.
38. What is used as an extinguishant in fire bottles?.
A. Freon compounds.
B. Halogenated hydrocarbons.
C. Water.
Ans : Halogenated hydrocarbons.
Explanation: Jeppesen Aircraft Gas Turbines Powerplant Page 13-6 refers, BUT Halogenated Hydrocarbons are Freon compounds. Rolls Royce Page 157 also refers.
39. The advantage of the two shot fire bottle system is.
A. one bottle can be discharged after certain time delay from the other bottle.
B. both bottles can be used in either of the engines.
C. one bottle can be used twice.
Ans : both bottles can be used in either of the engines.
Explanation: Jeppesen Gas Turbine Engines 13-6 refers. Note that each bottle can only be discharged once.
40. To check a fire bottle in situ is serviceable.
A. weigh it, check blow out discs, check pressure.
B. check blow out disc only.
C. check blow out disc, pop up indicators, expiry date and pressure.
Ans : check blow out disc, pop up indicators, expiry date and pressure.
Explanation: C.A.I.Ps AL3/10 para 4.3 mentions all these things.
41. Resistive type fire-wires are tested using.
A. megger/ohmmeter.
B. ammeter/ohmmeter.
C. megger/voltmeter.
Ans : megger/ohmmeter.
Explanation: The megger tests insulation the ohmmeter tests continuity.
42. When testing an installed fire bottle.
A. a multimeter used.
B. a lamp and 1.5V cell used.
C. a safety ohmmeter is used.
Ans : a safety ohmmeter is used.
Explanation: Any explosive device requires the use of a safety ohmmeter to limit current flow through the igniter.
43. On checking a fault free fire detection system.
A. use megger as per normal.
B. a megger is never to be used.
C. use a megger only for a short while as it can polarise the element.
Ans : use a megger only for a short while as it can polarise the element.
Explanation: The fault free or continuous loop firewire is capacitive and resistive. Prolonged use of the megger could polarise or charge the firewire, to give a false capacitive reading.
44. 3 ways to test serviceability of a fixed fire bottle in situ are.
A. weigh, pressure, blow-out disc.
B. weigh, pressure, pop up indicator.
C. pressure, pop up indicator, blow-out disc.
Ans : pressure, pop up indicator, blow-out disc.
Explanation: A&P Mechanic Handbook EA-AC-65 Page 401 refers( You can't weigh the bottle in situ).
45. When installing a flow valve on a 'two shot' fire extinguishing system care must be taken to make sure.
A. flow arrow should be in a correct direction.
B. flow valve is pointing towards the respective bottle.
C. priority system must have the bigger flow side.
Ans : flow arrow should be in a correct direction.
Explanation: Two shot systems do not have any priority. Any flow valve must be fitted in the right direction which is toward the engine not the bottle!.
46. Omission of crushable washer on engine fire-wire connector will.
A. allow moisture ingress.
B. affect fire wire continuity.
C. affect fire wire capacitance.
Ans : allow moisture ingress.
Explanation: Jeppesen A&P power plant page 11-10 refers to copper crush washers at the connectors. Answers a and c cannot be right therefore b makes best sense.
47. Discharge cartridges of the fire bottle have.
A. life time in hours/calendar and replace which ever is longer.
B. life time in hours/or calendar and replace which ever is sooner.
C. no life time it is only replaced when unserviceable.
Ans : life time in hours/or calendar and replace which ever is sooner.
Explanation: Operators usually change cartridges at planned checks. The cartridge also has a finite manufactures calendar life. This is normally longer.
48. The Kidde Fault Free Fire detection system has how many internal wires in the sensing element?.
A. 1.
B. 3.
C. 2.
Ans : 2.
Explanation: Jeppesen Gas Turbine Powerplants Page 12-5 Refers.
49. When testing a two pin fire bottle connector.
A. continuity test 1 pin then short two together.
B. short two pins together.
C. continuity test 1 pin, then the other, then short two together.
Ans : short two pins together.
Explanation: C.A.I.Ps EEL/1-7 para 3.6.4 States that to check for insulation short two pins together and check for insulation resistance between body and shorted pins from body.
50. Gas type fire-wires operate by utilising.
A. the change in the gas pressure.
B. the change in the gas dielectric level.
C. the change in the electrical resistance of the gas.
Ans : the change in the gas pressure.
Explanation: RR The Jet Engine page 156 Para 16 refers. These gas filled type fire-wires go by the name of 'Systron Donner'.
51. On a fire bottle, if the indicator pin was protruding, this would indicate.
A. the bottle is under weight.
B. extinguisher had been fired.
C. an over pressure had occurred in the bottle.
Ans : extinguisher had been fired.
Explanation: C.A.I.P's AL/3-10 describes and shows a discharge indicator pin device.
52. When testing a squib on a fire bottle, you use a.
A. multimeter (AVO).
B. low current ohmmeter.
C. lamp and 1.5V cell.
Ans : low current ohmmeter.
Explanation: Rolls Royce the Jet Engine Page 28 refers.
53. In a two shot fire extinguishing system.
A. extinguishers distributed once to either engine compartment.
B. extinguisher distributed twice to each enginecompartment.
C. one squib can be fired, if that fails then the 2nd squib can be fired.
Ans : extinguishers distributed once to either engine compartment.
Explanation: One shot from each bottle to either engine or both shots to one engine.
54. Methyl Bromide fire extinguisher are installed with neck.
A. horizontal.
B. at the bottom.
C. at the top.
Ans : at the top.
Explanation: The heavier fluid is pushed out of the bottle by the head of gas sitting above the liquid.
55. In a Fenwall fire detection system.
A. the tube is inconel and wire is nickel.
B. inner electrode is inconel wire.
C. outer electrode is nickel tube.
Ans : the tube is inconel and wire is nickel.
Explanation: NIL. www.fenwallcontrols.com
56. When a fire extinguisher is discharged the immediate action is.
A. operate engine to idle.
B. clean with cold water.
C. clean with hot water.
Ans : clean with hot water.
Explanation: When the extinguishant is introduced into the gas path hot water should be used. Jeppesen Gas Turbine Powerplants Page 13-8 refers.
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