Fuel System And Power Plants

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Fuel System And Power Plants - Quiz


The Boeing 737 is termed as the best-selling aircraft in the world and it has a world-class fuel system. Do you think that you understand the fuel system and can detect if it has any problems or when it is as it should be? If you just said yes then take up the quiz below and get to be sure.


Questions and Answers
  • 1. 

    In flight with a LOSS of all AC electrical power, how do the enigines get their fuel supply:

    • A.

      They automatically sucks fuel from centertank

    • B.

      From the main tanks 1 and 2, via suction bypass valves.

    • C.

      By crossfeeding the pneumatic pumps

    • D.

      By suction only from main tank 1

    Correct Answer
    B. From the main tanks 1 and 2, via suction bypass valves.
    Explanation
    The engines get their fuel supply from the main tanks 1 and 2, via suction bypass valves. This means that even in the event of a loss of all AC electrical power, the engines are still able to draw fuel from the main tanks using these valves. This ensures that the engines continue to receive fuel and can continue to operate during the flight.

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  • 2. 

    When the main tank fuel pump are selected to OFF, what indications do you get on the flight deck:

    • A.

      No Indication

    • B.

      OVERHEAT light will illuminate in the MASTER CAUTION system

    • C.

      “LOW PRESSURE” lights will illuminate, and “MASTER CAUTION”, and “FUEL” system annunciator light.

    • D.

      In the OVERHEAD Panel there will be a amber "LOW FUEL" Light

    Correct Answer
    C. “LOW PRESSURE” lights will illuminate, and “MASTER CAUTION”, and “FUEL” system annunciator light.
    Explanation
    When the main tank fuel pumps are selected to OFF, the "LOW PRESSURE" lights will illuminate, indicating that there is low pressure in the fuel system. Additionally, the "MASTER CAUTION" and "FUEL" system annunciator lights will also illuminate, alerting the flight crew to the issue. This is the correct answer as it accurately describes the indications that would be observed on the flight deck in this situation.

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  • 3. 

    When re-fuelling, when will the shut off system operate:

    • A.

      Automatically when each tank is full

    • B.

      By turning on the switch in the OVERHEAD Panel

    • C.

      When the BATT in turned ON

    • D.

      It operates automatically when the fuel level reaches 90 %

    Correct Answer
    A. Automatically when each tank is full
    Explanation
    The shut off system operates automatically when each tank is full during re-fuelling. This means that once the fuel level reaches its maximum capacity in each tank, the system will automatically shut off to prevent overfilling.

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  • 4. 

    A “CONFIG” alert on the center tank fuel quantity indicator means:

    • A.

      The Center tank contains 726 kgs or more, and both center tank pump output are below limits.

    • B.

      Low Fuel

    • C.

      The Center tank contains 453 kgs or more, and both center tank pump output are below limits

    • D.

      It indicates "LOW FUEL" temperature

    Correct Answer
    A. The Center tank contains 726 kgs or more, and both center tank pump output are below limits.
    Explanation
    The correct answer is that a "CONFIG" alert on the center tank fuel quantity indicator means that the center tank contains 726 kgs or more, and both center tank pump outputs are below limits. This alert is indicating the specific configuration of the center tank fuel quantity and pump outputs.

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  • 5. 

    Fuel bypass valves are installed in the event of a fuel pump failure in which tanks:

    • A.

      The Center tank

    • B.

      No 1 and no 2 tanks (main tanks)

    • C.

      Only no 1 main tank

    • D.

      Only no 2 main tank

    Correct Answer
    B. No 1 and no 2 tanks (main tanks)
    Explanation
    Fuel bypass valves are installed in the event of a fuel pump failure in both the No 1 and No 2 tanks (main tanks). This means that if the fuel pump fails in either of these tanks, the bypass valve will allow fuel to continue flowing to the engines from the other tank. This ensures that the engines continue to receive fuel and can operate normally, even if one of the main tanks experiences a fuel pump failure.

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  • 6. 

    The fuel temperature indicator reads the temp of the fuel in which tank:

    • A.

      The no 2 tank

    • B.

      Both tank 1 and 2

    • C.

      The Center tank

    • D.

      The no 1 tank

    Correct Answer
    D. The no 1 tank
    Explanation
    The correct answer is the no 1 tank. The fuel temperature indicator is used to measure the temperature of the fuel in the aircraft's tanks. In this case, it specifically reads the temperature of the fuel in the no 1 tank.

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  • 7. 

    Where is the manuel de-fueling valve selector located:

    • A.

      Outboard of the no 2 engine

    • B.

      Inboard of the no 1 engine

    • C.

      By the wheel well

    • D.

      Outboard of the no 1 engine

    Correct Answer
    A. Outboard of the no 2 engine
    Explanation
    The manuel de-fueling valve selector is located outboard of the no 2 engine.

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  • 8. 

    When both crossfeed switch and valve are both open, the crossfeed “VALVE OPEN” light will illuminate. What colour is the light:

    • A.

      Dim blue

    • B.

      Bright blue

    • C.

      Amber

    • D.

      Red

    Correct Answer
    A. Dim blue
    Explanation
    When both the crossfeed switch and valve are open, the "VALVE OPEN" light will illuminate. The light is described as "dim blue."

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  • 9. 

    When does the fuel “IMBAL” alert display:

    • A.

      When an imbalance of 453 kgs occurs between the main tanks.

    • B.

      When the Centertank contains 726 kgs or more.

    • C.

      You are low on FUEL in main tanks

    • D.

      An imbalance of 726 kgs occurs between the main tanks

    Correct Answer
    A. When an imbalance of 453 kgs occurs between the main tanks.
    Explanation
    The fuel "IMBAL" alert displays when there is an imbalance of 453 kgs between the main tanks. This means that the amount of fuel in one main tank is 453 kgs more or less than the other main tank. The alert is designed to notify the pilot of this imbalance so that appropriate actions can be taken to correct it and ensure proper fuel distribution.

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  • 10. 

    Illumination of the fuel “FILTER BYPASS” light is an indication of what:

    • A.

      FUEL is unable of reaching either engine no 1 or engine no 2

    • B.

      There is a FILTER malfunction

    • C.

      No Fuel remaining in the center tank

    • D.

      Impending filter bypass

    Correct Answer
    D. Impending filter bypass
    Explanation
    The correct answer is "Impending filter bypass." The illumination of the fuel "FILTER BYPASS" light indicates that there is a potential or imminent bypass of the fuel filter. This means that the fuel may not be properly filtered before reaching the engine, which can lead to potential issues or malfunctions. It serves as a warning sign for the need to address the filter bypass situation to ensure proper fuel filtration.

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  • 11. 

    When both center tank fuel pumps are switched off, when does the fuel scavenge pump operate:

    • A.

      When the No 1 tank is approx 50% empty, and its forward fuel pump is ON. It feeds the fuel into the No 1 main fuel tank.

    • B.

      By turning the switch to the on position in the OVERHEAD panel

    • C.

      Automatically when Fuel remains in Center tank

    • D.

      Automatically when main tank no 2 is reached 50 % or below

    Correct Answer
    A. When the No 1 tank is approx 50% empty, and its forward fuel pump is ON. It feeds the fuel into the No 1 main fuel tank.
    Explanation
    When the No 1 tank is approximately 50% empty and its forward fuel pump is ON, the fuel scavenge pump operates to transfer the fuel into the No 1 main fuel tank.

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  • 12. 

    If N1 or N2 exeeds teh operating limit, what indications are there on the N1 and N2 gauges:

    • A.

      The digital readout box and pointer change colour to RED

    • B.

      The digital readout box and pointer turns bright.

    • C.

      The digital readout box and pointer change colour to AMBER

    • D.

      The digital readout box and pointer change colour to GREEN

    Correct Answer
    A. The digital readout box and pointer change colour to RED
    Explanation
    When N1 or N2 exceeds the operating limit, the indication on the N1 and N2 gauges changes to red.

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  • 13. 

    In flight when is approach idle automatically selected:

    • A.

      When flaps are in landing configuration or engine anti-ice is ON

    • B.

      When flaps are in landing configuration or engine anti-ice is OFF

    • C.

      When flaps are in T/O configuration or engine anti-ice is ON

    • D.

      When flaps are in landing configuration.

    Correct Answer
    A. When flaps are in landing configuration or engine anti-ice is ON
    Explanation
    The correct answer is when the flaps are in the landing configuration or the engine anti-ice is ON. This means that when the aircraft is in the final stages of landing, with the flaps extended, or if the engine anti-ice system is activated, the approach idle will be automatically selected. This is done to ensure that the aircraft is in the appropriate configuration for landing and to provide the necessary power settings for a safe approach and landing.

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  • 14. 

    How many air sources are available to start the engines, what are they:

    • A.

      3, APU, external air cart or crossfeed start from an operating engine.

    • B.

      2, APU an the external air

    • C.

      1, external air

    • D.

      3, APU, external air cart or pack no 1 pneumatic.

    Correct Answer
    A. 3, APU, external air cart or crossfeed start from an operating engine.
    Explanation
    The correct answer is 3, APU, external air cart or crossfeed start from an operating engine. This means that there are three sources available to start the engines: the APU (Auxiliary Power Unit), an external air cart, or crossfeed start from an operating engine. These options provide different ways to supply air to the engines for starting purposes.

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  • 15. 

    After landing, what does the “REVERSER” light on the overhead panel ndicate:

    • A.

      The reverser is commanded to stow, but the reverser has not yet stowed. It will extinguish after 10 seconds if everything is OK (if there is a fault on the reverser system, the light will stay on).

    • B.

      That the reverser has been used

    • C.

      That you have to deploy REVERSER

    • D.

      That you have to retract the Reverser

    Correct Answer
    A. The reverser is commanded to stow, but the reverser has not yet stowed. It will extinguish after 10 seconds if everything is OK (if there is a fault on the reverser system, the light will stay on).
    Explanation
    The "REVERSER" light on the overhead panel indicates that the reverser is commanded to stow, but it has not yet stowed. The light will remain on for 10 seconds unless there is a fault in the reverser system, in which case it will stay on. This light serves as a warning to the pilot that the reverser has not fully retracted after landing.

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  • 16. 

    The EEC provides limit exeedance protection for what:

    • A.

      N1 and N2

    • B.

      N1

    • C.

      OVERHEAT in the APU, ENG 1 and ENG 2

    • D.

      Overspeed in the N1

    Correct Answer
    A. N1 and N2
    Explanation
    The EEC (Electronic Engine Control) provides limit exceedance protection for both N1 and N2. N1 and N2 refer to the rotational speeds of the engine's compressor sections. The EEC monitors these speeds and ensures they do not exceed the predetermined limits. If the N1 or N2 speeds exceed the limits, the EEC takes corrective actions to prevent any damage to the engine. This protection is crucial for maintaining the engine's performance and safety during operation.

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  • 17. 

    The HMU engine fuel shutoff valve are controlled by:

    • A.

      Engine start levers and engine fire switches

    • B.

      By the EEC

    • C.

      Only By the Fire handle

    • D.

      By the cutoff valve

    Correct Answer
    A. Engine start levers and engine fire switches
    Explanation
    The HMU engine fuel shutoff valve is controlled by the engine start levers and engine fire switches. These controls allow the pilot to start and stop the engine, as well as activate the fire suppression system if needed. By manipulating the start levers and fire switches, the pilot can control the flow of fuel to the engine, ensuring safe and efficient operation.

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  • 18. 

    During an engine start on ground, what does a flashing EGT digital display indicate:

    • A.

      The EEC has detected an impending SLOW START

    • B.

      The EEC has detected an impending COLD START

    • C.

      The EEC has detected an impending HOT START

    • D.

      The EEC has detected a warm Engine

    Correct Answer
    C. The EEC has detected an impending HOT START
    Explanation
    A flashing EGT (Exhaust Gas Temperature) digital display during an engine start on the ground indicates that the Engine Electronic Control (EEC) has detected an impending hot start. This means that the temperature of the exhaust gases is rising too quickly, which could lead to potential damage to the engine if not addressed. The EEC monitors various parameters during engine start to ensure a safe and efficient start-up process.

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  • 19. 

    With the ignition selected to L or R and the Engine Starts Switch in the OFF position, when would ignition be activated automatically:

    • A.

      When a rapid decrease in the N2 is detected (i.e. flameout).

    • B.

      There will be no activation unless you turn start swithes to Flight or CONT

    • C.

      When a rapid decrease in the N1 is detected (i.e. flameout).

    • D.

      When a rapid decrease in the compressor is detected (i.e. flameout).

    Correct Answer
    A. When a rapid decrease in the N2 is detected (i.e. flameout).
    Explanation
    When the ignition is selected to L or R and the Engine Starts Switch is in the OFF position, the ignition will be activated automatically when a rapid decrease in the N2 is detected, which indicates a flameout. This means that if the engine's rotational speed decreases rapidly, indicating a loss of power, the ignition system will automatically activate to try to restart the engine and prevent a flameout.

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  • 20. 

    The engine starter rotates which shaft of the engine:

    • A.

      The N1 compressor

    • B.

      The N2 compressor

    • C.

      5th stage

    • D.

      9th stage

    Correct Answer
    B. The N2 compressor
    Explanation
    The N2 compressor is the correct answer because it is responsible for compressing the air that enters the engine and is essential for the combustion process. The rotation of the N2 compressor shaft is crucial for starting the engine and initiating the airflow necessary for the engine to function properly.

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  • 21. 

    What is the engine starter cut-out N2 speed:

    • A.

      56% N2

    • B.

      52% N2

    • C.

      50% N1

    • D.

      56% N1

    Correct Answer
    A. 56% N2
    Explanation
    The engine starter cut-out N2 speed is 56% N2. This means that once the N2 speed of the engine reaches 56%, the starter is automatically disengaged.

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  • 22. 

    What does ON and “ALTN” indicate on the EEC switch:

    • A.

      With the EEC switch ON, the EEC has automatically switched into soft alternate mode.

    • B.

      With the EEC switch ON, the EEC has automatically switched into cutoff mode.

    • C.

      With the EEC switch ON, the HDMU has automatically switched into soft alternate mode

    • D.

      Alternate malfunction accours

    Correct Answer
    A. With the EEC switch ON, the EEC has automatically switched into soft alternate mode.
    Explanation
    The correct answer is that with the EEC switch ON, the EEC has automatically switched into soft alternate mode. This means that the Engine Electronic Control (EEC) system has detected a fault or abnormal condition and has automatically switched to a backup mode known as soft alternate mode. In this mode, the EEC will continue to provide limited engine control and protection functions, allowing the aircraft to continue operating safely until the issue can be resolved.

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  • 23. 

    How many ignition systems are contained in each engine:

    • A.

      2 high energy AC systems

    • B.

      1 in each

    • C.

      5 in total

    • D.

      2 high energy DC systems

    Correct Answer
    A. 2 high energy AC systems
    Explanation
    Each engine contains 2 high energy AC systems.

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  • 24. 

    Illumination of the “OIL Filter BYPASS” light indicates impending bypass of which component:

    • A.

      The main oil filter (scavenge filter).

    • B.

      Engine Oil

    • C.

      The Heat Exchanger

    • D.

      The main filter valve

    Correct Answer
    A. The main oil filter (scavenge filter).
    Explanation
    When the "OIL Filter BYPASS" light illuminates, it indicates that the main oil filter (scavenge filter) is about to bypass. This means that the oil is not being filtered properly and contaminants may be circulating in the engine. It is important to address this issue promptly to prevent any damage to the engine.

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  • 25. 

    What ignition systems are activated by placing the engine starts switch to FLT:

    • A.

      Both igniters, when the engine start lever in flight mode

    • B.

      Both igniters, when the engine start lever is at MAX

    • C.

      Only one Ignitor

    • D.

      Both igniters, when the engine start lever is at IDLE.

    Correct Answer
    D. Both igniters, when the engine start lever is at IDLE.
    Explanation
    When the engine start lever is at IDLE, both igniters are activated. This means that both igniters will be providing a spark to ignite the fuel-air mixture in the engine for a smooth start.

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  • 26. 

    What provides engine fuel heating:

    • A.

      An AC driven pump

    • B.

      Engine and IDG lubrication OIL

    • C.

      Bleed air from the respective Engine

    • D.

      APU exhaust

    Correct Answer
    B. Engine and IDG lubrication OIL
    Explanation
    The engine and IDG lubrication oil provides engine fuel heating. This is because the lubrication oil is circulated through the fuel/oil heat exchanger, which heats the fuel before it enters the engine. This helps to prevent fuel freezing and ensures proper combustion in the engine.

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  • 27. 

    What is the indication that a thrust reverser has fully deployed:

    • A.

      A green “REV” indication above the N1 display and free movment of the reverse thrust lever.

    • B.

      The REV indication turns Amber

    • C.

      A green “REV” indication above the N1 display and free movment of the thrust levers

    • D.

      The REV indication light becomes bright

    Correct Answer
    A. A green “REV” indication above the N1 display and free movment of the reverse thrust lever.
    Explanation
    The indication that a thrust reverser has fully deployed is a green "REV" indication above the N1 display and free movement of the reverse thrust lever. This means that the thrust reverser is in the fully deployed position and ready to be used for reverse thrust.

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