737 Engines And APU

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| By Jorge Quintero
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Jorge Quintero
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Quizzes Created: 2 | Total Attempts: 302
Questions: 26 | Attempts: 160

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737 Engines And APU - Quiz

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Questions and Answers
  • 1. 

    N1 is the ______ pressure compressor and is a primary engine indication

    • A.

      Low

    • B.

      Bypass Air

    • C.

      High

    • D.

      Turbine outlet

    Correct Answer
    A. Low
    Explanation
    The correct answer is "Low". In a gas turbine engine, N1 refers to the rotational speed of the low-pressure compressor. It is an important parameter in engine performance and is often displayed as a primary indication on the engine instruments. Therefore, N1 is the low-pressure compressor and is a primary engine indication.

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  • 2. 

    N2 is the ________ pressure compressor and is a secondary engine indication 

    • A.

      Low

    • B.

      Bypass air

    • C.

      Turbine outlet

    • D.

      High 

    Correct Answer
    D. High 
    Explanation
    The correct answer is "High". In an aircraft engine, N2 refers to the rotational speed of the high-pressure compressor. It is a secondary engine indication that provides information about the high-pressure compressor's performance. A high N2 pressure indicates that the compressor is operating at a high speed, which is desirable for efficient engine performance.

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  • 3. 

    The start levers positions are_______

    • A.

      Idle and start

    • B.

      Idle and cutoff 

    • C.

      Start and cutoff 

    • D.

      On and off

    Correct Answer
    B. Idle and cutoff 
    Explanation
    The correct answer is "Idle and cutoff." The start levers positions are typically set to idle and cutoff when the aircraft is on the ground and not in use. The idle position allows for the engines to run at a low power setting, while the cutoff position completely shuts off the fuel flow to the engines. This configuration ensures safety and prevents accidental engine starts when the aircraft is not in operation.

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  • 4. 

    Reverse thrust cannot be selected unless________

    • A.

      There is a weight-on-wheels signal

    • B.

      The reverse Idle position is armed

    • C.

      The forward thrust lever is at Idle

    • D.

      There is a weight-on-wheels signal and wheel spin up 

    Correct Answer
    C. The forward thrust lever is at Idle
    Explanation
    Reverse thrust cannot be selected unless the forward thrust lever is at Idle.

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  • 5. 

    Positioning an engine Start Lever to Cutoff closes the _________

    • A.

      Respective spar fuel shutoff valve only

    • B.

      Respective engine fuel shutoff valve only

    • C.

      Respective spar and engine fuel shutoff valves

    • D.

      Spar and engine fuel shutoff valves for both engines

    Correct Answer
    C. Respective spar and engine fuel shutoff valves
    Explanation
    Positioning an engine Start Lever to Cutoff closes the respective spar and engine fuel shutoff valves. When the engine Start Lever is moved to the Cutoff position, it cuts off the fuel supply to both the spar and engine of the respective engine. This is an important safety measure to prevent fuel flow to the engine and spar in case of emergencies or during maintenance procedures.

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  • 6. 

    The________compares commanded N1 to actual N1 and adjusts fuel flow to achieve commanded N1

    • A.

      Hydromechanical unit (HMU)

    • B.

      Power management computer (PMC)

    • C.

      Electronic engine control (EEC)

    • D.

      Flight management computer (FMC)

    Correct Answer
    C. Electronic engine control (EEC)
    Explanation
    The Electronic Engine Control (EEC) is responsible for comparing the commanded N1 (rotational speed of the engine) to the actual N1 and making adjustments to the fuel flow in order to achieve the commanded N1. This ensures that the engine operates at the desired speed and maintains optimal performance. The EEC continuously monitors and regulates various engine parameters to ensure efficient and reliable engine operation.

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  • 7. 

    The electronic engine control (EEC) in either normal or Alternate mode does not provide_______ protection

    • A.

      High engine vibration

    • B.

      N1 overspeed 

    • C.

      EGT redline

    • D.

      N2 overspeed

    Correct Answer
    C. EGT redline
    Explanation
    The electronic engine control (EEC) in either normal or Alternate mode does not provide protection against EGT redline. EGT stands for Exhaust Gas Temperature, and the redline refers to the maximum temperature limit that should not be exceeded. The EEC is responsible for monitoring and controlling various engine parameters, but in this case, it does not have a specific mechanism to prevent the engine from reaching or exceeding the EGT redline.

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  • 8. 

    In normal mode the electronic engine control (EEC) uses________conditions and________to calculate N1 thrust ratings

    • A.

      Sense flight/HMU demand

    • B.

      Last valid flight/HMU demand

    • C.

      Store flight/beeps air demand 

    • D.

      Sense flight/Bleed air demand

    Correct Answer
    D. Sense flight/Bleed air demand
    Explanation
    In normal mode, the electronic engine control (EEC) uses the sensed flight conditions and the bleed air demand to calculate the N1 thrust ratings. The sensed flight conditions refer to the data collected from various sensors on the aircraft, such as airspeed, altitude, and temperature, which are used to determine the current flight conditions. The bleed air demand refers to the amount of air being extracted from the engine to power other aircraft systems, such as air conditioning and pressurization. By considering both the flight conditions and the bleed air demand, the EEC can accurately calculate the appropriate N1 thrust ratings for the engine.

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  • 9. 

    If an engine EEC switch has both the ON (white) and ALTN (amber) displays illuminated. The engine is operating in ________mode

    • A.

      Soft alternate

    • B.

      Hard alternate 

    • C.

      Either soft or hard alternate

    • D.

      Single channel ALTN

    Correct Answer
    C. Either soft or hard alternate
    Explanation
    When both the ON (white) and ALTN (amber) displays of an engine EEC switch are illuminated, it indicates that the engine is operating in either soft or hard alternate mode. This means that there is a problem with the engine's primary control system, and the alternate control system has taken over to ensure the engine's continued operation. The specific mode (soft or hard) would depend on the severity of the issue and the capabilities of the alternate control system.

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  • 10. 

    If an Engine control (amber) light illuminates_______

    • A.

      Select ALTN for engine #1 EEC

    • B.

      There is a non-dispatchable fault in the engine control

    • C.

      The autothrottle (A/T) is inoperative and you must control the engine manually 

    • D.

      Avoid icing conditions

    Correct Answer
    B. There is a non-dispatchable fault in the engine control
    Explanation
    If an Engine control (amber) light illuminates, it indicates that there is a non-dispatchable fault in the engine control. This means that there is a problem with the engine control system that cannot be resolved or fixed before the aircraft is dispatched for a flight. It is necessary to address this fault before the aircraft can be cleared for operation.

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  • 11. 

    The thrust mode display indicates R-TO (Green). What mode is active?

    • A.

      Reduce takeoff thrust

    • B.

      Takeoff thrust dearth (no assumed temp) reduced takeoff

    • C.

      Assumed temperature (not derate) reduce takeoff 

    • D.

      Reject takeoff

    Correct Answer
    A. Reduce takeoff thrust
    Explanation
    The correct answer is "Reduce takeoff thrust." The thrust mode display indicates R-TO (Green), which stands for Reduced Takeoff. This mode is active when the aircraft is using reduced thrust for takeoff, typically achieved by setting lower engine power settings or using assumed temperature methods.

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  • 12. 

    What causes the Eng Fail Alert (amber) on the EGT indicator

    • A.

      The start lever has been moved to cutoff

    • B.

      N2 drops below 50% and start lever in Idle

    • C.

      N1 drops below 50% and start lever in Idle

    • D.

      A non-dispatchable fault in Engine control system (EEC)

    Correct Answer
    B. N2 drops below 50% and start lever in Idle
    Explanation
    When the N2 drops below 50% and the start lever is in Idle, it causes the Eng Fail Alert (amber) on the EGT indicator. This indicates that there is a problem with the engine, specifically with the N2 speed. The N2 speed dropping below 50% while the start lever is in Idle suggests that there may be an issue with the engine control system or the engine itself, which triggers the alert.

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  • 13. 

    On the ground after engine shutdown a red box around the EGT readout indicates

    • A.

      An in flight exceedance has occurred 

    • B.

      Nothing. This is a normal indication 

    • C.

      An in flight underspeed condition existed

    • D.

      An in flight Engine Fail ( ENG FAIL) condition was corrected

    Correct Answer
    A. An in flight exceedance has occurred 
    Explanation
    After the engine has been shut down, a red box around the EGT (Exhaust Gas Temperature) readout indicates that an in-flight exceedance has occurred. This means that during the flight, the EGT level exceeded the normal or recommended range. This could be a cause for concern as it may indicate a potential issue with the engine or its performance.

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  • 14. 

    Reverse video displayed on the Engine Vibration readout indicates

    • A.

      High engine vibration level

    • B.

      Normal engine vibration level

    • C.

      An engine shutdown 

    • D.

      The night brightness mode

    Correct Answer
    A. High engine vibration level
    Explanation
    The reverse video displayed on the Engine Vibration readout indicates a high engine vibration level. This means that the engine is experiencing excessive vibrations, which can be a cause for concern as it may indicate a potential issue or malfunction in the engine. It is important to address and investigate high engine vibrations to ensure the safety and proper functioning of the engine.

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  • 15. 

    During a normal preflight power ON; start levers in cutoff the ENG Valve Closed lights (blue) and Spar Valve Closed lights (blue) should be_________

    • A.

      Not illuminated which indicates the valves are closed

    • B.

      Illuminated bright which indicates the valves are open

    • C.

      Illuminated dim which indicates the valves are closed

    • D.

      Illuminated bright which indicates the valves are inoperative

    Correct Answer
    C. Illuminated dim which indicates the valves are closed
    Explanation
    The correct answer is "Illuminated dim which indicates the valves are closed." During a normal preflight power ON, the ENG Valve Closed lights and Spar Valve Closed lights should be illuminated dim, which indicates that the valves are closed.

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  • 16. 

    An illuminated Filter Bypass light (amber) indicates 

    • A.

      A fuel pressure sensor failure in the first stage of the HMU

    • B.

      An impending fuel filter bypass due to a contaminated filter

    • C.

      An impending fuel filter bypass due to a switch in EEC logic

    • D.

      A fuel pressure sensor failure in the second stage of the HMU

    Correct Answer
    B. An impending fuel filter bypass due to a contaminated filter
    Explanation
    The correct answer is "An impending fuel filter bypass due to a contaminated filter." This means that the amber light indicates that there is a potential issue with the fuel filter, specifically that it may become bypassed due to contamination. This could lead to impurities entering the engine, causing potential damage or performance issues.

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  • 17. 

    What is the indication if the engine oil pressure drops below redline during takeoff roll (>80kts)

    • A.

      The indication is a steady Low Oil Pressure (amber) light

    • B.

      The indication is a blinking Low Oil Pressure (amber) light

    • C.

      No indication because all alerts inhibited on the ground

    • D.

      The indication is a blinking Low Oil Pressure (amber) light for ten seconds and then a steady blinking Low Oil Pressure (amber) light

    Correct Answer
    A. The indication is a steady Low Oil Pressure (amber) light
    Explanation
    If the engine oil pressure drops below redline during takeoff roll (>80kts), the indication will be a steady Low Oil Pressure (amber) light.

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  • 18. 

    The ignition Select switch in the IGN R position selects

    • A.

      The right igniter for use on both engines

    • B.

      Both igniters for use on the right

    • C.

      The right igniter for use on the right engine

    • D.

      The right igniter for both engines and APU

    Correct Answer
    A. The right igniter for use on both engines
    Explanation
    The correct answer is that the ignition Select switch in the IGN R position selects the right igniter for use on both engines. This means that when the switch is in this position, the right igniter will be activated and used for both engines.

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  • 19. 

    In flight, the engine start switch in CONT provides ignition_________with the engine start lever in Idle. ( Select all correct answers)

    • A.

      To both igniters when N2 is below Idle

    • B.

      To selected (L or R) igniters when N2 is below idle

    • C.

      To selected igniters when the engine is operating normally———

    • D.

      To both igniters when the engine is operating normally 

    Correct Answer
    A. To both igniters when N2 is below Idle
    Explanation
    The engine start switch in CONT provides ignition to both igniters when N2 is below Idle.

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  • 20. 

    The engine start switch set to FLT provides ignition to_______ with the engine start lever idle

    • A.

      Both igniters

    • B.

      Selected (L or R) igniters if N2 is below Idle 

    • C.

      Selected (L or R) igniters

    • D.

      Both igniters (only if ENG TAI is selected ON)

    Correct Answer
    A. Both igniters
    Explanation
    When the engine start switch is set to FLT, it provides ignition to both igniters with the engine start lever idle. This means that both igniters will receive the necessary spark to ignite the fuel-air mixture in the engine.

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  • 21. 

    A steady Start Valve Open (amber) light indicates the________

    • A.

      Star switch is in GRD

    • B.

      Start Valve is open and supplying air to the starter

    • C.

      Start valve is open irrespective of whether it is supplying air to the starter

    • D.

      Starter valve has opened uncommanded by start switch

    Correct Answer
    B. Start Valve is open and supplying air to the starter
    Explanation
    The steady Start Valve Open (amber) light indicates that the Start Valve is open and supplying air to the starter.

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  • 22. 

    The reverser (amber) light on the AFT overhead panel illuminated for more than 12seconds triggers the master Caution ENG annunciation to indicate the thrust reverser 

    • A.

      Is fully deployed 

    • B.

      Is fully deployed but the isolation valve remained open

    • C.

      Sleeves are unlocked 

    • D.

      Has a malfuction

    Correct Answer
    D. Has a malfuction
    Explanation
    When the reverser (amber) light on the AFT overhead panel stays illuminated for more than 12 seconds, it indicates a malfunction. This means that there is an issue with the thrust reverser system, which is not functioning properly. The other options, such as the reverser being fully deployed or the sleeves being unlocked, do not align with the given information about the reverser light staying on for an extended period of time. Therefore, the most appropriate explanation is that the reverser has a malfunction.

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  • 23. 

    During normal APU operations the APU will automatically shutdown for all of the following lights escept________

    • A.

      Fault

    • B.

      Maint

    • C.

      Overspeed

    • D.

      Low Oi Pressure

    Correct Answer
    B. Maint
    Explanation
    During normal APU operations, the APU will automatically shutdown for all of the following lights except "Maint" (Maintenance). This means that if any of the other lights, such as "Fault," "Overspeed," or "Low Oil Pressure," are illuminated, the APU will automatically shut down. However, if the "Maint" light is on, it indicates that maintenance is required but it does not trigger an automatic shutdown of the APU.

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  • 24. 

    After the APU reaches 95% RPM if the Low Oil Pressure (amber) light is still illuminated 

    • A.

      The APU initiates an automatic shutdown

    • B.

      The light extinguishes when the APU begins powering the transfer bus

    • C.

      It is normal during the start sequence and remains ON until APU Oil Pressure is normal 

    • D.

      It indicates there is enough oil in the APU for 30-50 hours of operation 

    Correct Answer
    A. The APU initiates an automatic shutdown
    Explanation
    After the APU reaches 95% RPM, if the Low Oil Pressure (amber) light is still illuminated, it indicates that there is a problem with the oil pressure in the APU. In response to this issue, the APU initiates an automatic shutdown as a safety measure to prevent any damage or failure. The automatic shutdown helps to protect the APU and maintain its operational efficiency. Therefore, the correct answer is that the APU initiates an automatic shutdown.

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  • 25. 

    In EEC hard alternate mode thrust is________

    • A.

      Equal to or greater than normal mode thrust the same lever position

    • B.

      Less than normal mode thrust for the same lever position

    • C.

      Never more then a normal mode thrust for the same lever position 

    • D.

      Normally equal to normal mode thrust for the same lever position below ISA

    Correct Answer
    A. Equal to or greater than normal mode thrust the same lever position
    Explanation
    In EEC hard alternate mode, the thrust is equal to or greater than normal mode thrust for the same lever position. This means that when the lever is in the same position, the thrust output in EEC hard alternate mode will be the same or higher than in normal mode.

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  • 26. 

    On the upper display unit an amber REV indicates that the thrust reverser sleeve is________. A green REV indicates that the thrust Reverser sleeve is______

    • A.

      Not moving/deployed

    • B.

      Moving from its stowed position/armed

    • C.

      In transit or not commanded position/deployed

    • D.

      Moving from its stowed position/providing maximum reverse thrust

    Correct Answer
    C. In transit or not commanded position/deployed
    Explanation
    An amber REV indicates that the thrust reverser sleeve is in transit or not in the commanded position. This means that the sleeve is currently moving or not in the position it is supposed to be in. On the other hand, a green REV indicates that the thrust reverser sleeve is deployed. This means that the sleeve is in the commanded position and is providing maximum reverse thrust.

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  • Current Version
  • Jul 28, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Feb 10, 2019
    Quiz Created by
    Jorge Quintero
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