Aircraft Fuel System Trivia Quiz!

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Aircraft Fuel System Trivia Quiz! - Quiz

Are you an aircraft engineer and think that you have enough information to tackle this fuel system trivia quiz? One of the things that you should know is what a normal system looks like and how to prevent it from failure. Give it a shot and get to see just how many questions you get correct. All the best as you tackle it!


Questions and Answers
  • 1. 

    In its natural state oxygen is

    • A.

      Tasteless, colorless, and odorless

    • B.

      Tasteless, volumeless, and odorless

    • C.

      Tasteless, colorless, and weightless

    • D.

      Volumeless, weightless, and colorless

    Correct Answer
    A. Tasteless, colorless, and odorless
    Explanation
    Oxygen is tasteless, colorless, and odorless in its natural state. This means that it does not have a distinct taste, it cannot be seen, and it does not have a noticeable smell.

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  • 2. 

    What gaseous oxygen (GOX) system valve type prevents a complete loss of oxygen?

    • A.

      Filler

    • B.

      Check

    • C.

      Shutoff

    • D.

      Pressure-reducing

    Correct Answer
    B. Check
    Explanation
    A check valve is designed to allow flow in only one direction, preventing backflow. In the case of a gaseous oxygen (GOX) system, a check valve would prevent a complete loss of oxygen by ensuring that oxygen can only flow in one direction and not back into the system. This is important for safety reasons, as a complete loss of oxygen could be dangerous or even fatal in certain situations.

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  • 3. 

    The supply and distribution tubing for aircraft oxygen systems is identified by cellulose tape that is

    • A.

      Brown and orange

    • B.

      Blue and yellow

    • C.

      Green and white

    • D.

      Black and red

    Correct Answer
    C. Green and white
    Explanation
    The supply and distribution tubing for aircraft oxygen systems is identified by green and white cellulose tape. This color combination is used to easily differentiate the oxygen system tubing from other types of tubing in the aircraft. The green and white tape helps maintenance personnel and pilots quickly identify and locate the oxygen system components, ensuring that they are properly maintained and serviced.

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  • 4. 

    The disadvantae of a continuous-flow oxygen regulator is that it

    • A.

      Wastes oxygen

    • B.

      Is unusable below 10,000 feet

    • C.

      Is usable only above 20,000 feet

    • D.

      Delivers oxygen at varying pressures

    Correct Answer
    A. Wastes oxygen
    Explanation
    A continuous-flow oxygen regulator is a device that delivers a constant flow of oxygen to the user. The disadvantage of this type of regulator is that it wastes oxygen. This means that some of the oxygen being delivered is not being effectively utilized by the user, resulting in a loss of oxygen. This can be a concern, especially in situations where oxygen supply is limited or needs to be conserved.

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  • 5. 

    What does the molecular sieve oxygen generating system (MSOGS) concentrator supply to the oxygen regulator control panel?

    • A.

      16 man-minutes of oxygen

    • B.

      93 percent oxygen-enriched gas

    • C.

      97 percent nitrogen-enriched gas

    • D.

      100 percent oxygen-enriched gas

    Correct Answer
    A. 16 man-minutes of oxygen
    Explanation
    The molecular sieve oxygen generating system (MSOGS) concentrator supplies 16 man-minutes of oxygen to the oxygen regulator control panel.

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  • 6. 

    Liquid oxygen (LOX) converts to gaseous oxygen (GOx) at an expansion ratio of

    • A.

      600 to 1

    • B.

      680 to 1

    • C.

      800 to 1

    • D.

      860 to 1

    Correct Answer
    D. 860 to 1
    Explanation
    Liquid oxygen (LOX) converts to gaseous oxygen (GOx) at an expansion ratio of 860 to 1. This means that when liquid oxygen expands, it increases in volume by a ratio of 860 to 1, resulting in the formation of gaseous oxygen. This expansion occurs due to the increase in temperature and decrease in pressure, causing the liquid oxygen to vaporize and convert into a gas.

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  • 7. 

    Except during servicing, the liquid oxygen (LOX) system's combination fill, buildup, and vent valve is always in the

    • A.

      Fill position

    • B.

      Vent position

    • C.

      Normal position

    • D.

      Buildup position

    Correct Answer
    D. Buildup position
    Explanation
    The liquid oxygen (LOX) system's combination fill, buildup, and vent valve is always in the buildup position, except during servicing. This position allows the LOX system to accumulate and pressurize the liquid oxygen before it is transferred to the desired location. The buildup position ensures that the system is ready for operation and maintains the necessary pressure for efficient functioning.

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  • 8. 

    On an Aircraft Liquid Oxygen systems (LOX), the handle on a manually operated buildup and vent valve is designed to prevent

    • A.

      A slow pressure buildup

    • B.

      Rapid venting of systems pressure

    • C.

      LOX system pressure loss during maintencance

    • D.

      The filler access door from closing in the vent position

    Correct Answer
    D. The filler access door from closing in the vent position
    Explanation
    The handle on a manually operated buildup and vent valve is designed to prevent the filler access door from closing in the vent position.

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  • 9. 

    Bleed air is usually take from which part of the engine section?

    • A.

      Intake

    • B.

      Turbine

    • C.

      Exhaust

    • D.

      Compressor

    Correct Answer
    D. Compressor
    Explanation
    Bleed air is usually taken from the compressor section of the engine. The compressor section is responsible for compressing the incoming air before it enters the combustion chamber. Bleed air is extracted from the compressor at various stages to provide air for various system requirements, such as cabin pressurization, anti-icing, and air conditioning.

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  • 10. 

    Aircraft engine tempature and pressure as it applies to the bleed air system is determined by the

    • A.

      Ambient pressure and ambient temperature

    • B.

      Engine throttle setting and ambient altitude

    • C.

      Ambient pressure and engine throttle setting

    • D.

      Engine throttle setting and ambient temperature

    Correct Answer
    D. Engine throttle setting and ambient temperature
    Explanation
    The temperature and pressure of the aircraft engine in relation to the bleed air system are influenced by the engine throttle setting and the ambient temperature. The engine throttle setting determines the power output of the engine, which affects the temperature and pressure of the air being circulated. Additionally, the ambient temperature, or the temperature of the surrounding environment, also plays a role in determining the temperature and pressure of the air. Therefore, the engine throttle setting and ambient temperature are the factors that determine the aircraft engine temperature and pressure as it applies to the bleed air system.

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  • 11. 

    What is the purpose of the engine bleed air (EBA) check valves?

    • A.

      Prevent the loss of compressed bleed air

    • B.

      Maintain balanced airflow from each engine

    • C.

      Provide a primary source for compressed bleed air

    • D.

      Reduced bleed air pressure when the pressure is too high

    Correct Answer
    A. Prevent the loss of compressed bleed air
    Explanation
    The purpose of the engine bleed air (EBA) check valves is to prevent the loss of compressed bleed air. These valves ensure that the air remains contained within the system and does not escape, which is important for maintaining the proper functioning of various aircraft systems that rely on the compressed bleed air. By preventing the loss of air, the check valves help to ensure that the aircraft's systems receive a consistent and reliable source of compressed bleed air.

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  • 12. 

    What engine bleed air (EBA) comonent prevents loss of air through the engine when it is shutdown?

    • A.

      Check valve

    • B.

      Shutoff valve

    • C.

      Isolation valve

    • D.

      Crossover valve

    Correct Answer
    B. Shutoff valve
    Explanation
    The shutoff valve is the component that prevents loss of air through the engine when it is shutdown. This valve is designed to close off the flow of bleed air, effectively sealing the engine and preventing any air from escaping. By shutting off the flow of air, the shutoff valve helps to maintain the integrity of the engine system and prevent any potential leaks or loss of pressure.

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  • 13. 

    The ducting for high-pressure/high-temperature air-conditioning is usally made of

    • A.

      Titanium

    • B.

      Aluminum

    • C.

      Stainless steel

    • D.

      Aluminium/nickel alloy

    Correct Answer
    C. Stainless steel
    Explanation
    Stainless steel is commonly used for ducting in high-pressure/high-temperature air-conditioning systems due to its excellent corrosion resistance, strength, and durability. It can withstand the harsh conditions and high temperatures without deforming or deteriorating, making it a reliable choice for such applications. Additionally, stainless steel has a smooth surface, which helps in reducing air friction and improving airflow efficiency.

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  • 14. 

    What tool do you use to ensure alignment and asealing when installing a V-band clamp on air conditioning ducting?

    • A.

      Screwdriver

    • B.

      Center punch

    • C.

      Rawhide mallet

    • D.

      Ball been hammer

    Correct Answer
    C. Rawhide mallet
    Explanation
    A rawhide mallet is used to ensure alignment and asealing when installing a V-band clamp on air conditioning ducting. The rawhide material of the mallet provides a soft and non-marring surface that allows for precise adjustments and prevents damage to the clamp or ducting. By using a rawhide mallet, the installer can gently tap the clamp into place, ensuring a tight and secure seal without causing any harm to the components.

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  • 15. 

    What type of high-pressure/high-temperatuer ducting does nto require a gasket?

    • A.

      Clamp flange

    • B.

      Bolted flange

    • C.

      Beaded flange

    • D.

      Compressible flange

    Correct Answer
    D. Compressible flange
    Explanation
    A compressible flange does not require a gasket because it is designed to create a tight seal by compressing the flange material against the mating surface. This type of flange is typically used in high-pressure and high-temperature applications where a gasket may not be able to withstand the extreme conditions. The compressible flange relies on the elasticity of the material to provide a reliable seal, making it a suitable choice for ducting systems operating under harsh environments.

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  • 16. 

    What lubricant can be used on a beaded channel clamp sleve to ease installation?

    • A.

      Soap

    • B.

      Water

    • C.

      Grease

    • D.

      Silicone

    Correct Answer
    B. Water
    Explanation
    Water can be used as a lubricant on a beaded channel clamp sleeve to ease installation. Water acts as a temporary lubricant and helps in reducing friction between the sleeve and the channel, making it easier to slide the sleeve into place. It is a common and easily accessible option for lubrication in such cases.

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  • 17. 

    The crush-type gasket used in aircraft ducting is made of

    • A.

      Fiber and fiberglass

    • B.

      Fiberglass and neoprene, or rubber

    • C.

      A soft aluminum, or fiber and metal mesh

    • D.

      A soft aluminum, and fiber reinforced rubber or plastic

    Correct Answer
    C. A soft aluminum, or fiber and metal mesh
    Explanation
    The crush-type gasket used in aircraft ducting is made of a combination of a soft aluminum and fiber and metal mesh. This combination of materials provides the gasket with flexibility and durability, allowing it to effectively seal the ducting and withstand the high temperatures and pressures experienced in aircraft systems. The soft aluminum provides a malleable and conformable surface, while the fiber and metal mesh add strength and stability to the gasket.

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  • 18. 

    Expansion joints in bleed air systems are best used for

    • A.

      Ram air ducting

    • B.

      A long run of ducting

    • C.

      A short run of ducting

    • D.

      Low-temperature/low-pressure ducting

    Correct Answer
    C. A short run of ducting
    Explanation
    Expansion joints in bleed air systems are best used for a short run of ducting because they allow for the movement and flexibility of the ducting system. A short run of ducting is more likely to experience thermal expansion and contraction, as well as vibrations and movements caused by the flow of air. Expansion joints can absorb these movements and prevent damage to the ducting system. In contrast, a long run of ducting may require other methods, such as expansion loops, to accommodate for expansion and contraction.

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  • 19. 

    What prevents fiberglass fabric ducts from swelling when the aircraft climbs to high altitudes?

    • A.

      Thermal compensators

    • B.

      Expansion bellows

    • C.

      Puckered flaps

    • D.

      Vent holes

    Correct Answer
    D. Vent holes
    Explanation
    Vent holes prevent fiberglass fabric ducts from swelling when the aircraft climbs to high altitudes. When the aircraft ascends to high altitudes, the air pressure decreases, causing the air inside the ducts to expand. Without vent holes, this expansion could cause the fiberglass fabric ducts to swell and potentially rupture. However, the presence of vent holes allows the air to escape, relieving the pressure and preventing swelling.

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  • 20. 

    What is defined as "a depression in the duct wall, where the surface of the material isn't cut or removed but the depression has caused sharp bends or creases in the material?"

    • A.

      Minor dent

    • B.

      Major dent

    • C.

      Scratch

    • D.

      Gouge

    Correct Answer
    B. Major dent
    Explanation
    A major dent is defined as a depression in the duct wall where the surface of the material is not cut or removed, but the depression has caused sharp bends or creases in the material. This means that the dent is significant and has caused noticeable damage to the material, potentially affecting its functionality or appearance.

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  • 21. 

    "the simultaneous control of tempature, humidity, and air distribution within a space" is the definition of

    • A.

      Engine bleed air

    • B.

      Air conditioning

    • C.

      Pressurization

    • D.

      Air control

    Correct Answer
    B. Air conditioning
    Explanation
    Air conditioning refers to the simultaneous control of temperature, humidity, and air distribution within a space. This means that an air conditioning system is responsible for regulating the temperature and humidity levels in a given area, while also ensuring that the air is evenly distributed throughout the space. This definition distinguishes air conditioning from other options such as engine bleed air, pressurization, and air control, which do not encompass all three aspects of temperature, humidity, and air distribution.

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  • 22. 

    What aircraft air conditioning system component is a radiator that cold ram air passes throught in order to cool the hot bleed air from the engines

    • A.

      Primary heat exchanger

    • B.

      Air cycle machine

    • C.

      Water seperator

    • D.

      Air cooler

    Correct Answer
    A. Primary heat exchanger
    Explanation
    The primary heat exchanger is a component in the aircraft air conditioning system that functions as a radiator. It allows cold ram air to pass through it, which in turn cools down the hot bleed air from the engines. This process helps in regulating the temperature of the air conditioning system and maintaining a comfortable environment inside the aircraft.

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  • 23. 

    What aircraft air conditioning system component controls the flow of ram air through the primary heat exchanger?

    • A.

      Air cycle machine

    • B.

      Refrigeration bypass valve

    • C.

      Movable inlet and exit doors

    • D.

      Primary ram air controller assemblies

    Correct Answer
    C. Movable inlet and exit doors
    Explanation
    The movable inlet and exit doors control the flow of ram air through the primary heat exchanger in an aircraft air conditioning system. These doors can be adjusted to regulate the amount of air entering and exiting the heat exchanger, thereby controlling the temperature and airflow in the cabin. By opening or closing these doors, the system can maintain the desired temperature and ensure proper cooling or heating of the air circulated in the aircraft.

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  • 24. 

    The rapid cooling of bleed air causes

    • A.

      The air pressure to increase

    • B.

      Moisture to condense in the form of fog

    • C.

      Ice to form in the secondary heat exchanger

    • D.

      A loss of pressure as it exits the air cycle machine compressor

    Correct Answer
    B. Moisture to condense in the form of fog
    Explanation
    The rapid cooling of bleed air causes moisture to condense in the form of fog. When air is rapidly cooled, its capacity to hold moisture decreases, leading to the condensation of water vapor in the air. This condensation forms tiny water droplets that appear as fog.

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  • 25. 

    As bleed air enteres the compressor of the air cycle machine, its pressure is increased. with the increase in pressure, there is also an increase in tempature. which component removes most of the increased temperature?

    • A.

      Primary heat exchanger

    • B.

      Secondary heat exchanger

    • C.

      Air cycle machine bypass valve

    • D.

      Air cycle machine expansion turbine

    Correct Answer
    B. Secondary heat exchanger
    Explanation
    The secondary heat exchanger removes most of the increased temperature. As bleed air enters the compressor of the air cycle machine, its pressure is increased, and with the increase in pressure, there is also an increase in temperature. The secondary heat exchanger is responsible for cooling down the air and removing the excess heat generated during the compression process. This helps to maintain the desired temperature and prevent any damage to the system.

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  • 26. 

    The low atmospheric pressure found at extremely high altitude can cause a person's blood vessels to

    • A.

      Shrink

    • B.

      Rupture

    • C.

      Contract

    • D.

      Collapse

    Correct Answer
    B. Rupture
    Explanation
    At extremely high altitudes, the atmospheric pressure decreases significantly. This low atmospheric pressure can have a detrimental effect on the human body, including the blood vessels. When the atmospheric pressure is low, the pressure inside the blood vessels becomes relatively higher, which can cause them to rupture. This rupture can lead to internal bleeding and other serious health issues. Therefore, the correct answer is "rupture."

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  • 27. 

    What controls the action of the outflow valve in a fixed-isobaric, single-differential pressurization systems?

    • A.

      A jet pump

    • B.

      Filtering cabin air

    • C.

      The unpressurized range

    • D.

      Regulating control chamber pressure

    Correct Answer
    D. Regulating control chamber pressure
    Explanation
    The action of the outflow valve in a fixed-isobaric, single-differential pressurization system is controlled by regulating control chamber pressure. This means that the pressure in the control chamber is adjusted to control the position of the outflow valve and regulate the cabin pressure. By regulating the control chamber pressure, the system maintains a consistent and desired cabin pressure throughout the flight.

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  • 28. 

    What are the parts of the isobaric section of the cabin pressure regulator

    • A.

      A diaphragm, fulcrum, and aneroid

    • B.

      A rocker arm, diaphragm, and fulcrum

    • C.

      An aneroid, spring, and metering valve

    • D.

      A spring, metering valve, and rocker arm

    Correct Answer
    C. An aneroid, spring, and metering valve
    Explanation
    The correct answer is an aneroid, spring, and metering valve. In an isobaric section of the cabin pressure regulator, an aneroid is used to measure the cabin pressure. The spring is responsible for controlling the tension and adjusting the pressure, while the metering valve regulates the flow of air to maintain the desired pressure level.

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  • 29. 

    What are the components of teh differential section of the cabin pressure regulator?

    • A.

      A spring, metering valve, and aneroid

    • B.

      An aneroid, rocker arm, and fulcrum

    • C.

      A rocker arm, fulcrum, and diaphragm

    • D.

      A diaphragm, spring, and metering valve

    Correct Answer
    D. A diaphragm, spring, and metering valve
    Explanation
    The correct answer is a diaphragm, spring, and metering valve. In the differential section of the cabin pressure regulator, these components work together to regulate the cabin pressure. The diaphragm senses the pressure difference between the cabin and the outside environment. The spring provides the necessary force to control the diaphragm's movement. The metering valve adjusts the flow of air to maintain the desired cabin pressure.

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  • 30. 

    What maintains pressure if the dual-differential cabin pressure regulator fails during flight?

    • A.

      The outflow valves

    • B.

      A manual controller

    • C.

      The cabin altitude selector

    • D.

      A positive pressure relief valve

    Correct Answer
    A. The outflow valves
    Explanation
    The outflow valves maintain pressure if the dual-differential cabin pressure regulator fails during flight. These valves control the flow of air out of the cabin, allowing the pressure inside the cabin to be regulated. If the pressure regulator fails, the outflow valves will still function and can be manually adjusted to maintain the desired cabin pressure.

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  • 31. 

    What is the purpose of the pneumatic relay in a cabin pressurization system?

    • A.

      Control the venting cabin pressure

    • B.

      Control the reference chamber pressure

    • C.

      Ensure that both outflow valves operate at the same time

    • D.

      Ensure that the aneroid and diaphragm inlet ports remain open

    Correct Answer
    C. Ensure that both outflow valves operate at the same time
    Explanation
    The purpose of the pneumatic relay in a cabin pressurization system is to ensure that both outflow valves operate at the same time. This is important for maintaining the desired cabin pressure and preventing any imbalance between the two valves. By synchronizing the operation of the outflow valves, the pneumatic relay helps to regulate the flow of air in and out of the cabin, thereby maintaining a safe and comfortable cabin environment for the occupants.

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  • 32. 

     in the varible isobaric pressurization system. the manual control valve is used as an alternate when the

    • A.

      Safety valve fails

    • B.

      Outflow valve fails

    • C.

      Pneumatic relay fails

    • D.

      Cabin pressure controller fails

    Correct Answer
    D. Cabin pressure controller fails
    Explanation
    In the variable isobaric pressurization system, the cabin pressure controller is responsible for maintaining the desired cabin pressure. If the cabin pressure controller fails, the manual control valve is used as an alternate to manually control the cabin pressure. This ensures that the cabin pressure remains at a safe and comfortable level for the occupants of the aircraft.

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  • 33. 

    The normal conenction for thermal switches in a fire warning system is in series with

    • A.

      Each other only

    • B.

      The power source and with the warning light

    • C.

      Each other and in parallel with the power source

    • D.

      The warning light and parallel with each other

    Correct Answer
    D. The warning light and parallel with each other
    Explanation
    In a fire warning system, the thermal switches are connected in parallel with each other and with the warning light. This means that each thermal switch and the warning light are connected to the power source separately. If any of the thermal switches detect a rise in temperature, it will close the circuit and activate the warning light, indicating a potential fire. Having the switches connected in parallel ensures that the warning light will be activated if any of the switches are triggered, providing a reliable and effective fire detection system.

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  • 34. 

    The fire detector, frequently used in fire warning systems, that has a high nickel steel rod located along the centerline of a stainless steel tube assembly is called

    • A.

      An electoconductive sensor

    • B.

      An iron fireman switch

    • C.

      A photoconductive cell

    • D.

      A FENWAL switch

    Correct Answer
    B. An iron fireman switch
    Explanation
    An iron fireman switch is a fire detector commonly used in fire warning systems. It consists of a stainless steel tube assembly with a high nickel steel rod located along its centerline. This design allows the iron fireman switch to detect the presence of fire or heat and trigger the appropriate response in the fire warning system.

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  • 35. 

    The direct current (DC) voltage supplied to the lights in a photoelectric circuit is pulsed at a rate of

    • A.

      10 Hz

    • B.

      100 Hz

    • C.

      200 Hz

    • D.

      400 Hz

    Correct Answer
    A. 10 Hz
    Explanation
    The correct answer is 10 Hz because in a photoelectric circuit, the direct current (DC) voltage supplied to the lights is pulsed at a rate of 10 Hz. This means that the voltage is being turned on and off 10 times per second. Pulsing the voltage at a specific frequency allows for precise control of the lights and can be used to achieve specific effects or to synchronize with other components in the circuit.

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  • 36. 

    A Liquid fire extinguishing agent douses a fire by

    • A.

      Releasing a fine mist vapor

    • B.

      Excluding oxygen from the area

    • C.

      Removing nitrogen from the area

    • D.

      Dispersing a large amount of liquid

    Correct Answer
    B. Excluding oxygen from the area
    Explanation
    A liquid fire extinguishing agent douses a fire by excluding oxygen from the area. Oxygen is necessary for combustion to occur, so by removing or reducing the oxygen supply, the fire is deprived of its fuel source and is extinguished.

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  • 37. 

    A gaseous nitrogen charge is added to a liquid fire extinguishing agent in order to

    • A.

      Convert the liquid to a gas upon discharge

    • B.

      Expel the agent from the bottle

    • C.

      Assist in extinguishing the fire

    • D.

      Stabilize the temperature

    Correct Answer
    B. Expel the agent from the bottle
    Explanation
    A gaseous nitrogen charge is added to a liquid fire extinguishing agent in order to expel the agent from the bottle. The pressure from the nitrogen gas builds up inside the bottle, causing the liquid agent to be forced out when the extinguisher is discharged. This helps in effectively delivering the extinguishing agent to the fire, allowing it to reach the flames and suppress them.

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  • 38. 

    What liquid-agent fire extinguisher container component holds in both the liquid agent and the nitrogen charge?

    • A.

      Squib

    • B.

      Frangible disc

    • C.

      Bonnet assembly

    • D.

      Rubber O-ring packing

    Correct Answer
    B. Frangible disc
    Explanation
    The frangible disc is the component of a liquid-agent fire extinguisher container that holds both the liquid agent and the nitrogen charge. The frangible disc is designed to rupture or break when the extinguisher is activated, allowing the liquid agent and the nitrogen charge to mix and be expelled from the container to extinguish the fire.

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  • 39. 

    In a liquid-agent fire extinguisher container, why is the frangible disc undercut into Pie-shaped sections?

    • A.

      Break cleanly into small pieces

    • B.

      Allow undisturbed fluid flow through the system

    • C.

      Enable the pieces to pass easily through the strainer

    • D.

      Prevent small pieces from passing through the strainer

    Correct Answer
    D. Prevent small pieces from passing through the strainer
    Explanation
    The frangible disc is undercut into pie-shaped sections in a liquid-agent fire extinguisher container to prevent small pieces from passing through the strainer. By dividing the disc into sections, it ensures that even if it breaks, the pieces will be large enough to be caught by the strainer and not clog the system. This design allows for undisturbed fluid flow through the system while still effectively filtering out any debris or fragments.

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  • 40. 

    What is usually located at the lowest point in a fuel tank?

    • A.

      Stump and drain

    • B.

      Pump and drain

    • C.

      Fuel

    • D.

      Pressure relief valve

    Correct Answer
    A. Stump and drain
    Explanation
    The correct answer is "stump and drain." In a fuel tank, the stump and drain are typically located at the lowest point. The stump is a small pipe or tube that extends into the tank, while the drain is a valve or plug that allows for the removal of any accumulated water or sediment. This design ensures that any impurities or contaminants settle at the bottom of the tank and can be easily drained out, preventing them from entering the fuel system.

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  • 41. 

    A bladder-type tank conromgs to the shape of the vacant cavity within the fuselage because it is made out of

    • A.

      A soft, malleable plastic

    • B.

      Rubber, or nylon material

    • C.

      Hardened, pre-formed plastic

    • D.

      Lightweight, pre-fromed aluminum

    Correct Answer
    B. Rubber, or nylon material
    Explanation
    The bladder-type tank conforms to the shape of the vacant cavity within the fuselage because it is made out of rubber or nylon material. These materials are soft and malleable, allowing the tank to easily adjust and fit into the available space. Additionally, rubber and nylon are flexible materials that can stretch and expand, ensuring a snug fit within the fuselage cavity.

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  • 42. 

    A centrifugal-type aircraft fuel pump may be used

    • A.

      For boost, transfer, or air refueling operations

    • B.

      In any area requiring a pump with no moving parts

    • C.

      To scavange the remaining fuel in low areas of a fuel tank

    • D.

      When the output volume of the pump must be in direct proportion to its speed

    Correct Answer
    A. For boost, transfer, or air refueling operations
    Explanation
    A centrifugal-type aircraft fuel pump can be used for boost, transfer, or air refueling operations because it is capable of delivering fuel at high pressure and flow rates. This type of pump is designed to handle the demands of these operations effectively. It is not mentioned in the explanation that the pump has no moving parts or that it scavenges fuel from low areas of a tank, so these characteristics are not relevant to the given answer. The key point is that the pump is suitable for boost, transfer, or air refueling operations.

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  • 43. 

    Wing tanks are

    • A.

      Bladder-type tanks that conform to vacant cavity within the wing

    • B.

      Lightweight, aluminum tanks inserted into empty wing cavities

    • C.

      Sealed-off parts of the wing structure

    • D.

      Soft, malleable plastic tanks

    Correct Answer
    C. Sealed-off parts of the wing structure
    Explanation
    Wing tanks are sealed-off parts of the wing structure. This means that they are compartments within the wing that are completely closed off from the rest of the aircraft. They are designed to hold fuel or other fluids and are an integral part of the wing's structure. Unlike bladder-type tanks or lightweight aluminum tanks, which are separate entities inserted into the wing, wing tanks are built-in and form a sealed part of the wing itself. They provide stability, balance, and efficient fuel storage for the aircraft.

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  • 44. 

    What type of fuel pump must have a fuel- and vapor-proof housing?

    • A.

      Jet

    • B.

      Ejector

    • C.

      Top-Mounted centrifugal pump is used when fuel supply is required furing periods of negative gravity conditions

    • D.

      Centrifugal pump with electrically driven, DC, series-wound motor

    Correct Answer
    D. Centrifugal pump with electrically driven, DC, series-wound motor
    Explanation
    A centrifugal pump with an electrically driven, DC, series-wound motor must have a fuel- and vapor-proof housing because it is used to pump fuel. The fuel- and vapor-proof housing is necessary to prevent any leakage or escape of fuel or vapors, which could be dangerous and potentially cause a fire or explosion. The housing ensures that the pump is sealed and secure, providing a safe and efficient operation for pumping fuel.

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  • 45. 

    What kind of centrifugal pump is used when a fuel supply is required during periods of negative gravity conditions?

    • A.

      Rotary vane

    • B.

      Top mounted

    • C.

      Dual impeller

    • D.

      In line ejector

    Correct Answer
    C. Dual impeller
    Explanation
    A dual impeller centrifugal pump is used when a fuel supply is required during periods of negative gravity conditions. This type of pump has two impellers, which allows it to generate higher pressure and flow rates compared to a single impeller pump. The dual impeller design ensures that the pump can effectively handle the challenges of negative gravity conditions and maintain a steady fuel supply.

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  • 46. 

    In a dual-impeller fuel pump what prevents foreign objects from holding the bypass valve open?

    • A.

      An inlet screen

    • B.

      An impeller screen

    • C.

      A one-way check valve

    • D.

      A two-way check valve

    Correct Answer
    A. An inlet screen
    Explanation
    An inlet screen prevents foreign objects from holding the bypass valve open in a dual-impeller fuel pump. This screen acts as a filter, allowing only fuel to enter the pump while blocking any debris or foreign objects. By preventing these objects from entering the pump and reaching the bypass valve, the inlet screen ensures that the valve can function properly and close when necessary.

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  • 47. 

    What air refueling pump components depend on fuel for lubrication ;)?

    • A.

      Rotors

    • B.

      Stators

    • C.

      Bearings

    • D.

      Impellers

    Correct Answer
    C. Bearings
    Explanation
    Bearings depend on fuel for lubrication. Bearings are used to reduce friction between moving parts in a pump, allowing them to rotate smoothly. In some air refueling pumps, the bearings are lubricated by the fuel itself, which helps to reduce wear and tear and ensure efficient operation. Without proper lubrication, the bearings can overheat and fail, leading to pump malfunction. Therefore, it is crucial for the bearings in air refueling pumps to have fuel for lubrication.

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  • 48. 

    What air refueling pump component removes fuel vapors caused by the centrifugal force of the impellers?

    • A.

      Rotor

    • B.

      Stator

    • C.

      Accumulator

    • D.

      Vapor relief valve

    Correct Answer
    A. Rotor
    Explanation
    The rotor is the component of the air refueling pump that removes fuel vapors caused by the centrifugal force of the impellers. The impellers generate centrifugal force, which causes the fuel vapors to separate from the liquid fuel. The rotor then collects and removes these vapors from the pump, ensuring that only liquid fuel is delivered for refueling purposes. The stator, accumulator, and vapor relief valve do not perform this specific function.

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  • 49. 

    The arrow stamped on teh body of a fuel system check valve indicates the

    • A.

      Direction of free flow

    • B.

      Direction of resisted flow

    • C.

      Location of the drilled hole in the valve

    • D.

      Location of the manufacturer's data block

    Correct Answer
    A. Direction of free flow
    Explanation
    The arrow stamped on the body of a fuel system check valve indicates the direction of free flow. This means that the arrow shows the direction in which the fuel can flow through the valve without any obstruction or resistance. It helps in ensuring that the fuel flows in the correct direction and prevents any backflow or blockage in the system.

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  • 50. 

    A pressure-loaded fuel system check valve is used

    • A.

      When a reverse flow of fuel is desired

    • B.

      To prevent the pump from overspeeding

    • C.

      When gravity flow through the vavle is undersirable

    • D.

      To preventexcessive pressuress when the pump overspeeds

    Correct Answer
    C. When gravity flow through the vavle is undersirable
    Explanation
    A pressure-loaded fuel system check valve is used when gravity flow through the valve is undesirable. This means that the check valve is designed to prevent fuel from flowing back through the valve due to gravity. This is important because gravity flow can disrupt the proper functioning of the fuel system and lead to issues such as pump overspeeding or excessive pressures. Therefore, the check valve is used to ensure that fuel only flows in the desired direction and to prevent any potential problems caused by gravity flow.

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