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FAA Flight Engineer Turbojet (Basic) Knowledge Test Practice Test

The FEJ knowledge test concerns turbojet flight-engineer systems and the principles used to monitor their operation. Practice questions sample fuel distribution, compressor airflow, engine controls, bleed-air use, and instrumentation, along with aircraft electrical and pitot-static systems. These topics connect engine indications with the supporting systems a flight engineer must interpret during aircraft operation.

Exam overview

Exam providerFederal Aviation Administration
Exam codeFEJ
CategoryAviation

About the FAA Flight Engineer Turbojet (Basic) Knowledge Test Exam

A flight engineer interprets system indications and recognizes how changes in one system can affect others. Engine-system questions can involve the compressor’s role in airflow, adjustable inlet guide vanes, fuel-control functions, and reasons for extracting compressor bleed air. Electrical-system items may require interpreting generator synchronization indications and understanding bonding and wire support. Pitot-static questions address how static pressure contributes to instrument readings, while temperature-indicating questions concern thermocouple signals. Practice with these concepts by tracing the path from a system’s input or control to its operational indication, then considering what an abnormal reading could imply. This supports the practical task of monitoring aircraft systems, identifying discrepancies, and communicating relevant conditions to the flight crew.

Sample Practice Questions

Review a selection from this exam's published US Practice Tests practice bank.

Question 1

What is the main purpose of a fuel crossfeed valve in an aircraft with multiple fuel tanks and engines?

  1. ATo allow fuel from one tank or side of the system to supply an engine normally fed from another side
  2. BTo increase fuel pressure by trapping fuel in the tank
  3. CTo drain water from the engine oil system
  4. DTo prevent all fuel transfer between tanks
Show answerCorrect answer: A

A crossfeed valve can connect fuel-system paths so an engine may receive fuel from a tank or side other than its normal source. Its use and limitations are aircraft-specific.

Question 2

What is the primary purpose of a turbine engine's compressor?

  1. ATo increase the pressure of air before it enters the combustion section
  2. BTo reduce the temperature of exhaust gases before they leave the engine
  3. CTo convert fuel into electrical power
  4. DTo control the direction of exhaust flow
Show answerCorrect answer: A

The compressor raises the pressure of incoming air, preparing it for combustion and increasing the efficiency of the engine cycle.

Question 3

When reading a synchroscope used to synchronize two AC generators, what does the direction of pointer rotation generally indicate?

  1. AWhich generator's frequency is higher
  2. BWhich generator has the higher oil pressure
  3. CWhich generator has the greater rated voltage
  4. DWhich generator is supplying more direct current
Show answerCorrect answer: A

A synchroscope indicates the phase relationship between two AC sources. The direction of pointer movement shows which source is running at the higher frequency, while the rate of movement reflects the frequency difference.

Question 4

What is the purpose of a bonding jumper between aircraft electrical components or structures?

  1. ATo provide a low-resistance electrical path that helps equalize electrical potential
  2. BTo increase the mechanical travel of a flight-control surface
  3. CTo insulate a fuel line from all temperature changes
  4. DTo regulate the cabin's oxygen concentration
Show answerCorrect answer: A

Bonding jumpers electrically connect components or structures to help maintain electrical continuity and reduce differences in electrical potential. Correct bonding also supports safe operation of electrical and lightning-protection systems.

Question 5

Why are aircraft electrical wires routed and supported with appropriate clamps?

  1. ATo reduce chafing, vibration damage, and interference with moving or hot parts
  2. BTo increase the electrical resistance of every circuit
  3. CTo ensure that all circuits share one fuse
  4. DTo keep wiring from carrying current during flight
Show answerCorrect answer: A

Proper routing and support protect wiring insulation and conductors from abrasion, vibration, heat, and contact with controls or other equipment. Installation practices must follow applicable aircraft data.

Question 6

Why is compressor bleed air sometimes extracted from a turbine engine during operation?

  1. ATo supply services such as cabin pressurization or anti-ice, as designed
  2. BTo lubricate the engine's accessory gears
  3. CTo increase fuel tank pressure directly
  4. DTo cool the aircraft's landing gear tires
Show answerCorrect answer: A

Bleed air is compressed air tapped from an appropriate engine compressor stage. Depending on the aircraft and engine design, it may supply pneumatic services such as environmental control or ice protection.

Question 7

What is the primary purpose of a turbine engine's inlet guide vanes when they are adjustable?

  1. ATo direct airflow into the compressor at a suitable angle and help control airflow at different operating conditions
  2. BTo meter fuel into the combustion chamber
  3. CTo prevent exhaust gases from entering the turbine
  4. DTo increase the electrical output of the engine-driven generator
Show answerCorrect answer: A

Adjustable inlet guide vanes condition the airflow entering the compressor. Their position can help maintain suitable airflow and compressor operation as engine conditions change.

How to use this practice test

The free FEJ practice bank contains 50 published questions. Each session presents up to 20 randomly selected questions, with results shown after the session. Use the results to identify which system functions or instrument principles need further review, then revisit those concepts before another session.

Preparation tips

  • Sketch a turbine-engine airflow path and label the compressor, inlet guide vanes, bleed-air extraction points, and fuel-control role.
  • For fuel-system questions, trace how a crossfeed valve can redirect fuel between tanks and engines; distinguish fuel routing from fuel metering.
  • Review AC generator synchronization indications, including what synchroscope pointer movement communicates about relative phase.
  • Compare bonding jumpers with wire clamps: one provides electrical continuity across components or structures, while the other supports and protects wiring.
  • Trace pitot and static pressure inputs to their instrument uses, and review how a thermocouple produces a temperature-indicating signal.
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