2AX5X Volume 3

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    The most prevalent method of refueling for ground servicing is

    • Nozzle.
    • Top-off.
    • Single-point.
    • Over-the-wing.
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2AX5X Volume 3 - Quiz
About This Quiz

The '2ax5x volume 3' quiz assesses knowledge on aircraft oxygen systems, focusing on their components, operations, and safety measures. It covers topics like gaseous and liquid oxygen systems, ensuring readiness and safety in military aviation environments.

Quiz Preview

  • 2. 

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

    • Wastes oxygen

    • Is usable below 10,000 feet

    • Is usable only above 20,000 feet

    • Delivers oxygen at varying pressures

    Correct Answer
    A. Wastes oxygen
    Explanation
    A continuous-flow oxygen regulator is disadvantageous because it wastes oxygen. This means that it does not efficiently utilize the oxygen supply, resulting in a higher consumption rate and potentially running out of oxygen sooner. This can be problematic, especially in situations where a limited oxygen supply is available, such as during high-altitude flights or in emergency medical settings.

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  • 3. 

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

    • Shrink.

    • Rupture.

    • Contract.

    • Collapse.

    Correct Answer
    A. Rupture.
    Explanation
    At extremely high altitudes, the atmospheric pressure decreases significantly. This decrease in pressure can have adverse effects on the human body, including the potential for blood vessels to rupture. The low atmospheric pressure causes the blood vessels to expand, and if the pressure difference becomes too great, it can lead to the rupture of these vessels. This can be particularly dangerous as it can result in internal bleeding and other serious health complications.

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  • 4. 

    In its natural state oxygen is?

    • Tasteless, colorless, and odorless

    • Tasteless, volumeless and odorless

    • Tasteless, colorless, and Weightless

    • Volumesless, weightless and colorless

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

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  • 5. 

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

    • Brown and orange

    • blue and yellow

    • Green and white

    • Black and red

    Correct Answer
    A. Green and white
    Explanation
    The supply and distribution tubing for aircraft oxygen systems is identified by cellulose tape that is green and white. This color combination is used to easily distinguish the oxygen tubing from other types of tubing in the aircraft. The green and white tape serves as a visual indicator for maintenance personnel and pilots to quickly identify and locate the oxygen supply and distribution system in case of emergency or routine checks.

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  • 6. 

    A liquid fire extinguishing agent douses a fire by

    • Releasing a fine mist vapor.

    • Excluding oxygen from the area.

    • Removing nitrogen from the area.

    • Dispersing a large amount of liquid.

    Correct Answer
    A. 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 the fuel it needs to continue burning. This can be achieved through the use of foam, water mist, or other chemical agents that displace or suppress the oxygen in the surrounding environment. By excluding oxygen, the fire is effectively smothered and extinguished.

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  • 7. 

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

    • Direction of free flow.

    • Direction of restricted flow.

    • Location of the drilled hole in the valve.

    • 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 when fuel flows through the valve, it will follow the direction of the arrow. This is important for proper functioning of the fuel system, as it ensures that fuel is flowing in the correct direction and prevents any blockages or restrictions in the flow.

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  • 8. 

    At a minimum, what should you wear when taking an oil sample?

    • Goggles.

    • Goggles and gloves.

    • Gloves and long sleeves.

    • Goggles and long sleeves.

    Correct Answer
    A. Goggles and gloves.
    Explanation
    When taking an oil sample, it is important to wear goggles and gloves for safety reasons. Goggles protect the eyes from any potential splashes or spills of the oil, which can be harmful if they come into contact with the eyes. Gloves, on the other hand, protect the hands from direct contact with the oil, preventing any potential skin irritation or chemical burns. Wearing both goggles and gloves ensures that both the eyes and hands are adequately protected during the oil sampling process.

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  • 9. 

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

    • Screwdriver

    • Center punch.

    • Rawhide mallet.

    • Ball peen hammer.

    Correct Answer
    A. Rawhide mallet.
    Explanation
    A rawhide mallet is used to ensure alignment and sealing when installing a V-band clamp on air-conditioning ducting. Rawhide mallets are made from rawhide, a material that is soft and non-damaging, making it ideal for use on delicate surfaces like ducting. When installing a V-band clamp, the rawhide mallet is used to tap the clamp into place, ensuring that it aligns correctly and creates a tight seal. The soft material of the mallet prevents any damage to the ducting while still providing enough force to secure the clamp in place.

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  • 10. 

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

    • Soap.

    • Water

    • Grease

    • Silicone.

    Correct Answer
    A. Water
    Explanation
    Water can be used as a lubricant on a beaded channel clamp sleeve to ease installation. Water acts as a temporary lubricant that reduces friction between the clamp sleeve and the surface it is being installed on. It allows the sleeve to slide more easily into place, making the installation process smoother and more efficient. Additionally, water is readily available and cost-effective, making it a convenient choice for this purpose.

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  • 11. 

    “The simultaneous control of temperature, humidity, and air distribution within a space” is the definition of

    • Engine bleed air.

    • Air conditioning.

    • Pressurization.

    • Air control.

    Correct Answer
    A. Air conditioning.
    Explanation
    Air conditioning is the correct answer because it refers to the simultaneous control of temperature, humidity, and air distribution within a space. Engine bleed air is the high-pressure air taken from the compressor section of a gas turbine engine, which is not related to temperature, humidity, and air distribution control. Pressurization refers to the process of increasing the air pressure within a space, but it does not necessarily involve controlling temperature and humidity. Air control is a general term that does not specifically refer to the simultaneous control of temperature, humidity, and air distribution.

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  • 12. 

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

    • Convert the liquid to a gas upon discharge.

    • Expel the agent from the bottle.

    • Assist in extinguishing the fire.

    • Stabilize the temperature.

    Correct Answer
    A. Expel the agent from the bottle.
    Explanation
    The gaseous nitrogen charge is added to the liquid fire extinguishing agent in order to expel the agent from the bottle. When the fire extinguisher is discharged, the pressure from the nitrogen gas forces the liquid agent out of the bottle, allowing it to reach the fire and extinguish it. The nitrogen charge creates the necessary pressure to propel the liquid agent effectively and efficiently.

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  • 13. 

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

    • Sump and drain.

    • Pump and drain.

    • Pressure relief valve.

    • Fuel-level control valve

    Correct Answer
    A. Sump and drain.
    Explanation
    The correct answer is sump and drain. In a fuel tank, the sump is typically located at the lowest point. The sump is designed to collect any sediment or water that may have accumulated in the tank. The drain is then used to remove this collected material from the tank. This helps to prevent any contaminants from being drawn into the fuel system, ensuring the fuel remains clean and free from any debris.

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  • 14. 

    The two types of oil coolers used in jet engine oil systems are air/oil and

    • Fuel/oil.

    • Freon/oil.

    • Water/oil.

    • Hydraulic/oil.

    Correct Answer
    A. Fuel/oil.
    Explanation
    The correct answer is fuel/oil. In jet engine oil systems, there are two types of oil coolers used: air/oil and fuel/oil. Air/oil coolers use the flow of air to cool the oil, while fuel/oil coolers use the flow of fuel to cool the oil. The fuel/oil cooler is a more efficient method of cooling the oil as it utilizes the cooler temperature of the fuel to remove heat from the oil. This helps in maintaining the optimal temperature of the oil and ensures proper lubrication and functioning of the jet engine.

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  • 15. 

    The rapid cooling of bleed air causes

    • The air pressure to increase.

    • Moisture to condense in the form of fog.

    • Ice to form in the secondary heat exchanger.

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

    Correct Answer
    A. Moisture to condense in the form of fog.
    Explanation
    When bleed air is rapidly cooled, the temperature of the air decreases, causing the moisture present in the air to condense. This condensation occurs in the form of fog, as the water vapor in the air turns into tiny water droplets suspended in the air. Therefore, the rapid cooling of bleed air causes moisture to condense in the form of fog.

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  • 16. 

    Fuel-controlled switches normally control circuits that indicate

    • Fuel-flow.

    • Fuel level.

    • Fuel pressure.

    • All of the above.

    Correct Answer
    A. All of the above.
    Explanation
    Fuel-controlled switches are designed to control circuits that indicate various aspects related to fuel. This includes fuel-flow, fuel level, and fuel pressure. These switches are essential in monitoring and maintaining the proper functioning of fuel-related systems. By controlling these circuits, fuel-controlled switches ensure that accurate information is provided to the operator or system, allowing for efficient fuel management and preventing any potential issues or failures. Therefore, the correct answer is "all of the above" as fuel-controlled switches control circuits that indicate fuel-flow, fuel level, and fuel pressure.

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  • 17. 

    What type of foreign particle appears in the fuel in a crystalline, granular, or glasslike form?

    • Rust.

    • Sand or dust

    • Brass shavings.

    • Aluminum or magnesium compounds.

    Correct Answer
    A. Sand or dust
    Explanation
    Foreign particles that appear in the fuel in a crystalline, granular, or glasslike form are typically sand or dust. These particles can contaminate the fuel and cause damage to the engine if not removed. Rust, brass shavings, and aluminum or magnesium compounds are not typically found in this form in fuel and would not be the correct answer.

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  • 18. 

    The ability to do work is the definition of

    • Energy

    • Inertia.

    • Friction.

    • Velocity

    Correct Answer
    A. Energy
    Explanation
    Energy is defined as the ability to do work. It is a fundamental concept in physics and is measured in joules. Energy can exist in various forms such as kinetic energy, potential energy, thermal energy, and chemical energy. It can be transferred or converted from one form to another, but it cannot be created or destroyed. Therefore, energy is the correct answer as it accurately describes the ability to do work.

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  • 19. 

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

    • Intake

    • Turbine

    • Exhaust

    • Compressor

    Correct Answer
    A. Compressor
    Explanation
    Bleed air is usually taken from the compressor section of the engine. The compressor is responsible for compressing the incoming air and supplying it to the combustion chamber. During this process, a small portion of the compressed air is bled off to perform various functions such as cabin pressurization, air conditioning, anti-icing, and starting other engines. Taking bleed air from the compressor ensures that it is at a high pressure and temperature, making it suitable for these applications.

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  • 20. 

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

    • Soft, malleable plastic.

    • Rubber or nylon material.

    • Hardened, pre-formed plastic.

    • Lightweight, pre-formed aluminum.

    Correct Answer
    A. Rubber or nylon material.
    Explanation
    A bladder-type tank conforms to the shape of the vacant cavity within the fuselage because it is made out of rubber or nylon material. Rubber and nylon are both soft and malleable materials that can easily adapt to the shape of the cavity. This flexibility allows the bladder-type tank to fit snugly within the fuselage, maximizing the use of available space. Additionally, rubber and nylon are also durable materials that can withstand the pressure and stress associated with storing and transporting fluids, making them suitable for use in bladder-type tanks.

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  • 21. 

    A well-designed aircraft fuel system will ensure

    • Positive and negative fuel-flow.

    • Negative fuel-flow under all conditions.

    • Positive fuel-flow under positive conditions.

    • Positive and reliable fuel-flow under all conditions.

    Correct Answer
    A. Positive and reliable fuel-flow under all conditions.
    Explanation
    A well-designed aircraft fuel system is expected to provide positive and reliable fuel-flow under all conditions. This means that the fuel system should consistently deliver fuel to the aircraft's engines, ensuring that they have a continuous and reliable source of fuel. This is crucial for the safe and efficient operation of the aircraft, as any interruption or inconsistency in fuel-flow could lead to engine failure or other operational issues. Therefore, a well-designed fuel system should be able to maintain a positive and reliable fuel-flow, regardless of the conditions or circumstances.

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  • 22. 

    Through the use of spectrometric oil analysis, aircraft will have a higher in-commission rate because there will be

    • More oil sampling

    • More engine removals.

    • Less unnecessary maintenance.

    • Less wear metal found in the oil.

    Correct Answer
    A. Less unnecessary maintenance.
    Explanation
    The correct answer is "less unnecessary maintenance." Spectrometric oil analysis helps to identify potential issues in the aircraft's engine by detecting wear metals in the oil. By detecting these issues early on, maintenance can be performed only when necessary, reducing the amount of unnecessary maintenance. This ultimately leads to a higher in-commission rate for the aircraft as it spends less time undergoing maintenance and more time in operation.

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  • 23. 

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

    • 600 to 1

    • 680 to 1

    • 800 to 1

    • 860 to 1

    Correct Answer
    A. 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 is converted into gaseous form, it expands in volume by a factor of 860. This expansion occurs due to the change in state from a liquid to a gas, where the molecules of the liquid oxygen gain energy and move more freely, occupying a larger space. This expansion ratio is important in various applications such as rocket propulsion, where the increase in volume allows for greater thrust and efficiency.

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  • 24. 

    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?”

    • Minor dent.

    • Major dent.

    • Scratch.

    • Gouge.

    Correct Answer
    A. Major dent.
    Explanation
    A major dent 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. This means that the dent is significant and has caused noticeable damage to the material.

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  • 25. 

    What aircraft air conditioning system component is a radiator that cold ram air passes through in order to cool the hot bleed air from the engine(s)?

    • Primary heat exchanger.

    • Air cycle machine.

    • Water separator.

    • Air cooler.

    Correct Answer
    A. Primary heat exchanger.
    Explanation
    The primary heat exchanger is a component in the aircraft air conditioning system that cools the hot bleed air from the engine(s). It acts as a radiator, allowing cold ram air to pass through and cool the hot air. This process helps regulate the temperature inside the aircraft and ensures that the air conditioning system functions properly.

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  • 26. 

    What is the basic purpose of the fuel vent system?

    • Move fuel from tank to tank.

    • Pressurize the fuel for transfer.

    • Remove residual fuel from manifolds.

    • Prevent fuel tank rupture or collapse.

    Correct Answer
    A. Prevent fuel tank rupture or collapse.
    Explanation
    The basic purpose of the fuel vent system is to prevent fuel tank rupture or collapse. This system is designed to release excess pressure or vacuum that can build up in the fuel tank due to temperature changes or fuel consumption. Without a properly functioning vent system, the pressure or vacuum could cause the fuel tank to rupture or collapse, leading to potential safety hazards. Therefore, the fuel vent system plays a crucial role in maintaining the integrity of the fuel tank and ensuring safe operation of the aircraft.

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  • 27. 

    After air is drawn into the guide vanes of a centrifugal jet engine compressor, it is subjected to

    • Radial and tangential forces

    • Rotational and tangential forces.

    • Rotational and centrifugal forces.

    • Mr. Harold Ballstein

    Correct Answer
    A. Rotational and centrifugal forces.
    Explanation
    In a centrifugal jet engine compressor, the air is drawn into the guide vanes and then subjected to two types of forces. The first force is rotational, which refers to the circular motion of the air as it moves through the compressor. The second force is centrifugal, which is the outward force experienced by the air due to its rotation. Therefore, the correct answer is rotational and centrifugal forces.

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  • 28. 

    What is the purpose of the exhaust duct?

    • Swirl exhaust gas-flow

    • Equalize exhaust gas-flow.

    • Modulate exhaust gas-flow.

    • Straighten exhaust gas-flow.

    Correct Answer
    A. Straighten exhaust gas-flow.
    Explanation
    The purpose of the exhaust duct is to straighten the flow of exhaust gas. This is important because exhaust gas often exits the system in a turbulent and uneven manner. By straightening the flow, the exhaust duct ensures that the gas flows smoothly and evenly, which can improve the overall efficiency and performance of the system.

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  • 29. 

    Some fuel level control valves have a dual-float system so that

    • There will be a double safety factor.

    • Two tanks can be filled at the same time.

    • The tank can be filled to either of two levels.

    • There is capability to fill or empty the tank.

    Correct Answer
    A. There will be a double safety factor.
    Explanation
    A fuel level control valve with a dual-float system provides a double safety factor. This means that there are two floats, which act as sensors to measure the fuel level in the tank. Having two floats increases the reliability and accuracy of the system, as it provides redundancy. If one float fails or malfunctions, the other float can still effectively control the fuel level. Therefore, the dual-float system ensures a higher level of safety and reduces the risk of fuel leaks or overflows.

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  • 30. 

    What prevents a fuel tank from collapsing if an air pressure regulator fails and excessive negative pressure develops?

    • Quick-disconnect valve.

    • Fuel-level control valve.

    • Low-level shutoff valve.

    • Pressure/vacuum relief valve.

    Correct Answer
    A. Pressure/vacuum relief valve.
    Explanation
    A pressure/vacuum relief valve prevents a fuel tank from collapsing if an air pressure regulator fails and excessive negative pressure develops. This valve is designed to release excess pressure or vacuum within the tank, ensuring that the tank does not collapse or become damaged due to the imbalance in pressure. It helps maintain a safe and stable pressure level within the fuel tank, preventing any potential hazards or structural failures.

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  • 31. 

    Fuel’s ability to hold contaminants in suspension is increased with a higher

    • Fuel to air ratio.

    • Specific gravity.

    • Temperature.

    • Viscosity.

    Correct Answer
    A. Viscosity.
    Explanation
    The ability of fuel to hold contaminants in suspension is increased with a higher viscosity. Viscosity refers to the thickness or resistance to flow of a liquid. When fuel has a higher viscosity, it means that it is thicker and has a higher resistance to flow. This thicker consistency allows the fuel to better hold contaminants, such as dirt or impurities, in suspension rather than settling at the bottom. Therefore, a higher viscosity contributes to the fuel's ability to keep contaminants suspended in the fuel, preventing them from causing damage or clogging fuel systems.

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  • 32. 

    How are fuel leaks categorized?

    • Major and minor.

    • Class 1 through 5.

    • Class A through D.

    • Internal and external.

    Correct Answer
    A. Class A through D.
    Explanation
    Fuel leaks are categorized into different classes, ranging from Class A through D. This classification system helps in identifying the severity and potential hazards associated with the leak. Class A refers to the most severe leaks, which can cause immediate danger and require immediate action. Class D, on the other hand, represents minor leaks that may not pose an immediate threat. By categorizing fuel leaks into classes, it becomes easier to prioritize and address them accordingly.

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  • 33. 

    Air and gases flowing through a jet engine require

    • Low velocity at all times.

    • Less velocity exiting than entering.

    • Equal velocity entering and exiting.

    • Greater velocity exiting than entering.

    Correct Answer
    A. Greater velocity exiting than entering.
    Explanation
    In a jet engine, air and gases need to be accelerated to generate thrust. This is achieved by increasing their velocity as they pass through the engine. The correct answer states that the velocity of the air and gases exiting the jet engine is greater than the velocity at which they entered. This is because the increased velocity of the exhaust gases creates a higher pressure difference between the front and back of the engine, resulting in a greater thrust force.

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  • 34. 

    A micron is a metric linear measurement equal toA micron is a metric linear measurement equal to

    • 1/25 of an inch

    • 1/25 of an inch

    • 1/2,500 of an inch.

    • 1/25,000 of an inch.

    Correct Answer
    A. 1/25,000 of an inch.
    Explanation
    A micron is a metric linear measurement that is equal to 1/25,000 of an inch. This means that a micron is a very small unit of measurement, much smaller than 1/25 or 1/2,500 of an inch. Therefore, the correct answer is 1/25,000 of an inch.

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  • 35. 

    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

    • An electroconductive sensor

    • An Iron Fireman switch.

    • A photoconductive cell.

    • A FENWAL® switch.

    Correct Answer
    A. An Iron Fireman switch.
    Explanation
    The correct answer is an Iron Fireman switch. The Iron Fireman switch is a type of fire detector commonly used in fire warning systems. It consists of a high-nickel steel rod located along the centerline of a stainless steel tube assembly. The purpose of this switch is to detect the presence of fire or heat and trigger the appropriate response, such as activating an alarm or sprinkler system.

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  • 36. 

    Wing tanks are

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

    • Lightweight, aluminum tanks inserted into empty wing cavities

    • Sealed-off parts of the wing structure

    • Soft, malleable plastic tanks.

    Correct Answer
    A. Sealed-off parts of the wing structure
    Explanation
    The correct answer is "sealed-off parts of the wing structure". Wing tanks are sealed-off compartments within the wing structure that are used to store fuel. They are not bladder-type tanks or lightweight aluminum tanks inserted into empty wing cavities. The term "soft, malleable plastic tanks" does not accurately describe wing tanks. Therefore, the correct answer is that wing tanks are sealed-off parts of the wing structure.

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  • 37. 

    Classification of fuel leaks is necessary in order to determine

    • How much fuel is being wasted.

    • The type of contaminant that is in the fuel.

    • Whether or not they constitute a flight safety hazard

    • Whether or not they constitute an environmental hazard.

    Correct Answer
    A. Whether or not they constitute a flight safety hazard
    Explanation
    Classification of fuel leaks is necessary in order to determine whether or not they constitute a flight safety hazard. This is important because fuel leaks can potentially lead to dangerous situations during flight, such as engine failure or fires. By classifying the leaks, aviation authorities can assess the severity of the hazard and take appropriate measures to mitigate the risk. This may involve repairs, maintenance, or grounding of the aircraft until the issue is resolved. Ultimately, the classification helps ensure the safety of the passengers and crew on board the aircraft.

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  • 38. 

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

    • Titanium.

    • Aluminum.

    • Stainless steel.

    • Aluminum/nickel alloy.

    Correct Answer
    A. Stainless steel.
    Explanation
    The ducting for high-pressure/high-temperature air-conditioning is usually made of stainless steel because it has excellent corrosion resistance and can withstand high temperatures and pressures. Stainless steel is also durable and has a long lifespan, making it suitable for use in demanding environments. Additionally, stainless steel is easy to clean and maintain, making it a practical choice for air-conditioning systems.

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  • 39. 

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

    • Break cleanly into small pieces.

    • Allow undisturbed fluid flow through the system.

    • Enable the pieces to pass easily through the strainer

    • Prevent small pieces from passing through the strainer.

    Correct Answer
    A. 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 creating pie-shaped sections, the disc is more likely to break cleanly into small pieces, which can be easily filtered by the strainer. This ensures that only the desired fluid flows through the system, without any small fragments that could potentially clog or damage the strainer.

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  • 40. 

    Which type of fuel contaminant can form a red, brown, gray, or black slime in the fuel?

    • Water.

    • Sediment.

    • Foreign particles

    • Microbial growth.

    Correct Answer
    A. Microbial growth.
    Explanation
    Microbial growth can form a red, brown, gray, or black slime in the fuel. This is because microorganisms such as bacteria and fungi can thrive in fuel tanks and feed on the hydrocarbons present in the fuel. As they multiply, they create a slimy substance that can clog fuel filters and cause engine problems. The color of the slime can vary depending on the type of microorganisms present and the conditions in the fuel tank.

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  • 41. 

    The combustion efficiency of a gas turbine is usually between

    • 60 and 70 percent.

    • 65 and 75 percent.

    • 75 and 95 percent.

    • 95 and 100 percent.

    Correct Answer
    A. 95 and 100 percent.
    Explanation
    The combustion efficiency of a gas turbine refers to how effectively the fuel is burned and converted into useful energy. A combustion efficiency of 95 and 100 percent indicates that almost all of the fuel is being efficiently burned and converted into energy, with very minimal waste. This high level of combustion efficiency is desirable as it leads to better fuel utilization and lower emissions, making it the correct answer.

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  • 42. 

    Fuel that accumulates after a failed start or after engine shutdown is

    • Drained overboard by a drain system.

    • Returned to the fuel control by tubes

    • Burned on the next start attempt.

    • Allowed to evaporate.

    Correct Answer
    A. Drained overboard by a drain system.
    Explanation
    After a failed start or engine shutdown, fuel that accumulates in the system needs to be removed. This is done by draining it overboard using a drain system. This ensures that the excess fuel does not remain in the system, which could cause issues in the next start attempt or lead to evaporation. By draining it overboard, the fuel is safely removed from the system.

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  • 43. 

    What type of fuel control uses thermocouples, relays, amplifiers, and solenoids, to help control the engine?

    • Pneumatic.

    • Fuel injection.

    • Hydromechanical.

    • Electrohydromechanical.

    Correct Answer
    A. Electrohydromechanical.
    Explanation
    Electrohydromechanical fuel control uses a combination of electrical and hydraulic components to control the engine. Thermocouples are used to measure the temperature, relays are used to control the flow of electricity, amplifiers are used to amplify the electrical signals, and solenoids are used to control the flow of hydraulic fluid. This type of fuel control system provides precise control over the fuel flow, ensuring optimal engine performance. Pneumatic fuel control relies on air pressure, fuel injection uses injectors to deliver fuel directly into the engine, and hydromechanical control uses mechanical components without electrical or hydraulic elements.

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  • 44. 

    What do you use to create a static seal between two stationary parts in the oil system?

    • Wadding

    • Packing.

    • Gasket.

    • Filler

    Correct Answer
    A. Gasket.
    Explanation
    A gasket is used to create a static seal between two stationary parts in an oil system. It is a mechanical seal that fills the space between the two parts, preventing leakage of oil or other fluids. Gaskets are commonly made of materials such as rubber, metal, or composite materials, and they are designed to withstand high pressure and temperature conditions in order to maintain a reliable seal.

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  • 45. 

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

    • Fill position

    • Vent position

    • Normal position

    • Buildup position

    Correct Answer
    A. 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 means that the valve is continuously allowing the buildup of liquid oxygen in the system. During servicing, the valve may be in a different position to facilitate maintenance or other procedures. However, during normal operation, the valve remains in the buildup position to ensure a constant supply of liquid oxygen in the system.

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  • 46. 

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

    • Fiber and fiberglass

    • Fiberglass and neoprene, or rubber

    • A soft aluminum, or fiber and metal mesh.

    • A soft aluminum, and fiber reinforced rubber or plastic.

    Correct Answer
    A. A soft aluminum, or fiber and metal mesh.
    Explanation
    The crush-type gasket used in aircraft ducting is made of a soft aluminum, or fiber and metal mesh. This type of gasket is designed to provide a tight seal in high-pressure environments. The soft aluminum allows for easy compression and deformation, ensuring a secure fit. The fiber and metal mesh provide additional strength and durability to the gasket, making it suitable for use in aircraft ducting where it may be subjected to vibrations and extreme temperatures.

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  • 47. 

    The purpose of a fuel/oil cooler in a fuel system is to

    • Heat the fuel and cool the oil.

    • Cool the fuel and cool the oil.

    • Heat the fuel and heat the oil.

    • cool the fuel and heat the oil.

    Correct Answer
    A. Heat the fuel and cool the oil.
    Explanation
    The purpose of a fuel/oil cooler in a fuel system is to heat the fuel and cool the oil. This is important because fuel needs to be heated in order to vaporize properly and enhance combustion efficiency. On the other hand, oil needs to be cooled to prevent overheating and maintain its lubricating properties. By heating the fuel and cooling the oil, the fuel/oil cooler ensures optimal performance and longevity of the fuel system components.

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  • 48. 

    The three benefits of the Joint Oil Analysis Program (JOAP) are improved safety, reduced maintenance cost, and

    • Recycling of used oil.

    • Production of wear metals.

    • Increased equipment availability.

    • Increased length of time between oil changes

    Correct Answer
    A. Increased equipment availability.
    Explanation
    The correct answer is increased equipment availability. The Joint Oil Analysis Program (JOAP) helps in identifying potential issues and predicting equipment failures through oil analysis. By detecting problems early on, maintenance can be scheduled proactively, minimizing downtime and increasing equipment availability. This benefit is crucial for industries that heavily rely on machinery and equipment for their operations. Improved safety and reduced maintenance costs are also advantages of JOAP, but the option of increased equipment availability directly addresses the three benefits mentioned in the question.

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  • 49. 

    Expansion joints in bleed air systems are best used for

    • Ram air ducting.

    • A long run of ducting.

    • A short run of ducting.

    • Low-temperature/low-pressure ducting.

    Correct Answer
    A. A short run of ducting.
    Explanation
    Expansion joints in bleed air systems are best used for a short run of ducting. This is because expansion joints are designed to absorb thermal expansion and contraction in the ducting system. In a short run of ducting, there is less distance for the expansion and contraction to occur, so an expansion joint can effectively accommodate the movement without causing stress or damage to the system. In a long run of ducting, the expansion and contraction may be more significant, requiring additional expansion joints or alternative solutions. Therefore, a short run of ducting is the most appropriate application for expansion joints in bleed air systems.

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Quiz Review Timeline (Updated): Mar 20, 2023 +

Our quizzes are rigorously reviewed, monitored and continuously updated by our expert board to maintain accuracy, relevance, and timeliness.

  • Current Version
  • Mar 20, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Dec 03, 2013
    Quiz Created by
    Skootermcgavin
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