2AX5X Volume 3
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.
Volumesless, weightless and colorless
Correct Answer
A. Tasteless, colorless, and odorlessExplanation
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.Rate this question:
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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. CheckExplanation
A check valve is a type of valve that allows the flow of fluid (in this case, gaseous oxygen) in only one direction. It prevents backflow, ensuring that oxygen does not flow back into the system and cause a complete loss. Therefore, a check valve is the correct valve type to prevent a complete loss of oxygen in a gaseous oxygen (GOX) system.Rate this question:
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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 whiteExplanation
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.Rate this question:
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- 4.
The disadvantage of a continuous-flow oxygen regulator is that it
- A.
Wastes oxygen
- B.
Is usable below 10,000 feet
- C.
Is usable only above 20,000 feet
- D.
Delivers oxygen at varying pressures
Correct Answer
A. Wastes oxygenExplanation
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.Rate this question:
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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
B. 93 percent oxygen-enriched gas.Explanation
The molecular sieve oxygen generating system (MSOGS) concentrator supplies the OXYGEN regulator control panel with 93 percent oxygen-enriched gas. This means that the gas being supplied has a higher concentration of oxygen compared to the surrounding air, which is typically around 21 percent oxygen. The MSOGS concentrator uses a molecular sieve to selectively remove nitrogen and other gases from the air, resulting in a higher concentration of oxygen in the output gas. This oxygen-enriched gas can then be used for various applications, such as medical purposes or in aircraft systems.Rate this question:
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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 1Explanation
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.Rate this question:
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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 positionExplanation
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.Rate this question:
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- 8.
On an aircraft liquid oxygen (LOX) system, the handle on a manually operated buildup and vent valve is designed to prevent
- A.
Slow pressure buildup
- B.
Rapid venting of system pressure
- C.
LOX system pressure loss during maintenance
- D.
The filler access door from closing in the vent position
Correct Answer
D. The filler access door from closing in the vent positionExplanation
The handle on a manually operated buildup and vent valve is designed to prevent the filler access door from closing in the vent position. This means that when the valve is in the vent position, the handle ensures that the filler access door remains open, allowing for the rapid venting of system pressure. This is important to prevent any potential pressure buildup and ensure the safe operation of the liquid oxygen (LOX) system.Rate this question:
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- 9.
Bleed air is usually taken from which part of the engine section?
- A.
Intake
- B.
Turbine
- C.
Exhaust
- D.
Compressor
Correct Answer
D. CompressorExplanation
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.Rate this question:
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- 10.
Aircraft engine temperature 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 amount of fuel and air mixture being supplied to the engine, which affects the temperature and pressure. Meanwhile, the ambient temperature refers to the temperature of the surrounding environment, which can also impact the engine temperature and pressure. Therefore, both factors play a role in determining the temperature and pressure of the aircraft engine in the bleed air system.Rate this question:
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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.
Reduce 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 being bled from the engine for various purposes, such as cabin pressurization and air conditioning, remains within the system and does not escape. By preventing the loss of compressed bleed air, the check valves help maintain the efficiency and effectiveness of the aircraft's systems that rely on this air supply.Rate this question:
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- 12.
What engine bleed air (EBA) component 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, ensuring that it does not escape from the engine. By closing the shutoff valve, the bleed air is effectively contained within the engine, preventing any loss or leakage. This helps to maintain the integrity of the air system and ensures that the bleed air is available for use when the engine is started up again.Rate this question:
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- 13.
The ducting for high-pressure/high-temperature air-conditioning is usually made of
- A.
Titanium.
- B.
Aluminum.
- C.
Stainless steel.
- D.
Aluminum/nickel alloy.
Correct Answer
C. 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.Rate this question:
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- 14.
What tool do you use to ensure alignment and sealing when installing a V-band clamp on air-conditioning ducting
- A.
Screwdriver
- B.
Center punch.
- C.
Rawhide mallet.
- D.
Ball peen hammer.
Correct Answer
C. 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.Rate this question:
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- 15.
What type of high-pressure/high-temperature ducting does not require a gasket?
- A.
Clamp flange.
- B.
Bolted flange.
- C.
Beaded flange.
- D.
Compressible flange
Correct Answer
D. Compressible flangeExplanation
A compressible flange is a type of high-pressure/high-temperature ducting that does not require a gasket. This type of flange uses a compressible material, such as rubber or elastomer, to create a seal between the two mating surfaces. When the flange is tightened, the compressible material is compressed, creating a tight and secure seal without the need for a gasket. This design is often used in applications where a gasket may not be suitable or where a more flexible seal is required.Rate this question:
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- 16.
What lubricant can be used on a beaded channel clamp sleeve to ease installation?
- A.
Soap.
- B.
Water
- C.
Grease
- D.
Silicone.
Correct Answer
B. WaterExplanation
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.Rate this question:
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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 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.Rate this question:
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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. 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.Rate this question:
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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. As the aircraft ascends, the air pressure decreases, causing a potential for the air trapped within the ducts to expand. However, the presence of vent holes allows the air to escape, preventing the ducts from swelling or becoming damaged. This ensures the proper functioning and integrity of the duct system during high altitude flights.Rate this question:
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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 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.Rate this question:
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- 21.
“The simultaneous control of temperature, 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 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.Rate this question:
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- 22.
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)?
- A.
Primary heat exchanger.
- B.
Air cycle machine.
- C.
Water separator.
- D.
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.Rate this question:
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- 23.
What aircraft air conditioning system component controls the flow of ram air through the primary heat exchangers?
- 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 doorsExplanation
Movable inlet and exit doors control the flow of ram air through the primary heat exchangers in an aircraft air conditioning system. These doors can be adjusted to regulate the amount of air entering and exiting the heat exchangers, allowing for proper cooling or heating of the air before it is distributed throughout the aircraft. By controlling the flow of ram air, the movable inlet and exit doors help maintain the desired temperature and comfort level inside the aircraft cabin.Rate this question:
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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
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.Rate this question:
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- 25.
As bleed air enters the compressor of the air cycle machine, its pressure is increased. With the increase in pressure, there is also an increase in temperature. Which component removes most of this 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 exchangerExplanation
The secondary heat exchanger removes most of the increased temperature in the air cycle machine. As bleed air enters the compressor, its pressure is increased, leading to an increase in temperature. The secondary heat exchanger is responsible for transferring this excess heat to the surrounding environment, allowing the air cycle machine to maintain its efficiency and prevent overheating.Rate this question:
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- 26.
The low atmospheric pressure found at extremely high altitudes 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 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.Rate this question:
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- 27.
What controls the action of the outflow valve in a fixed-isobaric, single-differential pressurization system?
- 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
In a fixed-isobaric, single-differential pressurization system, the action of the outflow valve is controlled by regulating control chamber pressure. This means that the pressure in the control chamber is adjusted to control the opening and closing of the outflow valve, which in turn regulates the cabin pressure. By adjusting the control chamber pressure, the system can maintain a constant cabin pressure regardless of changes in altitude or external conditions.Rate this question:
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- 28.
What are the components of the differential section of the cabin pressure regulator?
- A.
A spring, metering valve, 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 components of the differential section of the cabin pressure regulator are a diaphragm, spring, and metering valve. The diaphragm is responsible for sensing the pressure difference and initiating the necessary adjustments. The spring provides the necessary force for the diaphragm to function properly. The metering valve controls the flow of air to maintain the desired cabin pressure. This combination of components allows for the regulation and control of the cabin pressure in an aircraft.Rate this question:
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- 29.
What are the parts of the isobaric section of the cabin pressure regulator?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. -
- 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
If the dual-differential cabin pressure regulator fails during flight, the outflow valves would maintain the pressure. These valves are responsible for regulating the airflow in and out of the cabin, ensuring that the pressure remains at a safe and comfortable level. By adjusting the position of the outflow valves, the cabin pressure can be controlled even if the regulator fails.Rate this question:
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- 31.
What is the purpose of the pneumatic relay in a cabin pressurization system?
- A.
Control the venting of 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. If the outflow valves do not operate simultaneously, it can lead to an imbalance in cabin pressure, causing discomfort or potential safety issues for passengers and crew. The pneumatic relay helps to synchronize the operation of the outflow valves, ensuring that they open and close together to maintain the desired pressure in the cabin.Rate this question:
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- 32.
N the variable 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
The correct answer is cabin pressure controller fails. In an isobaric pressurization system, the cabin pressure controller is responsible for maintaining a constant pressure inside the aircraft cabin. If the cabin pressure controller fails, it means that it is no longer able to regulate the cabin pressure. In such a scenario, the manual control valve can be used as an alternate to manually control the cabin pressure and ensure the safety of the passengers and crew onboard.Rate this question:
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- 33.
The normal connection 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 normal connection for thermal switches is in parallel with each other and with the warning light. This means that all the thermal switches are connected to each other in a parallel circuit, and this parallel circuit is also connected in parallel with the warning light. This configuration ensures that if any of the thermal switches detect a rise in temperature, the circuit will be completed and the warning light will be activated, indicating a fire hazard.Rate this question:
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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 electroconductive sensor
- B.
An Iron Fireman switch.
- C.
A photoconductive cell.
- D.
A FENWAL® switch.
Correct Answer
B. 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.Rate this question:
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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 DC voltage supplied to the lights is pulsed at a frequency of 10 Hz. This means that the voltage is turned on and off 10 times per second. The frequency of the pulses determines the rate at which the lights flicker or flash. A higher frequency would result in a faster flickering, while a lower frequency would result in a slower flickering. Therefore, 10 Hz is the correct answer as it represents the rate at which the DC voltage is pulsed in the circuit.Rate this question:
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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 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.Rate this question:
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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
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.Rate this question:
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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. A frangible disc is a thin, breakable disk that is designed to rupture when the extinguisher is activated, allowing the agent and charge to be released. It acts as a barrier between the liquid agent and the nitrogen charge, ensuring that they are kept separate until needed.Rate this question:
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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 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.Rate this question:
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- 40.
What is usually located at the lowest point in a fuel tank?
- A.
Sump and drain.
- B.
Pump and drain.
- C.
Pressure relief valve.
- D.
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.Rate this question:
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- 41.
A bladder-type tank conforms to the shape of the vacant cavity within the fuselage because it is made out of
- A.
Soft, malleable plastic.
- B.
Rubber or nylon material.
- C.
Hardened, pre-formed plastic.
- D.
Lightweight, pre-formed aluminum.
Correct Answer
B. 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.Rate this question:
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- 42.
Wing tanks are
- A.
Bladder-type tanks that conform to the 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 structureExplanation
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.Rate this question:
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- 43.
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 scavenge 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 operationsExplanation
A centrifugal-type aircraft fuel pump may be used for boost, transfer, or air refueling operations because it is capable of delivering fuel at high pressure and flow rates, which are necessary for these operations. The centrifugal design of the pump allows it to generate the required pressure by using centrifugal force to push the fuel outward. Additionally, the absence of moving parts in the pump reduces the risk of mechanical failure, making it suitable for use in various operational scenarios.Rate this question:
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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 with variable-speed hydraulic drive.
- D.
Centrifugal pump with electrically driven, direct current (DC), series-wound motor.
Correct Answer
D. Centrifugal pump with electrically driven, direct current (DC), series-wound motor.Explanation
A centrifugal pump with an electrically driven, direct current (DC), series-wound motor must have a fuel- and vapor-proof housing because it is used to pump fuel. This type of pump is commonly used in automotive applications and needs to be able to handle fuel and prevent any leakage or vapor escape, which could be dangerous. A fuel- and vapor-proof housing ensures that the pump operates safely and efficiently without any risk of fuel leakage or vapor emissions.Rate this question:
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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 is designed with two impellers that work together to provide a continuous flow of fuel even in situations where gravity is working against the flow. The dual-impeller design allows for efficient pumping and ensures a reliable fuel supply in challenging conditions.Rate this question:
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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 pass through while blocking any debris or foreign objects that could potentially interfere with the bypass valve. By keeping the bypass valve free from obstruction, the inlet screen ensures proper functioning of the fuel pump and prevents any potential damage or malfunction caused by foreign objects.Rate this question:
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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 in an air refueling pump depend on fuel for lubrication. Bearings are components that support the rotating parts of the pump, allowing them to move smoothly. In this case, the bearings rely on the fuel to provide lubrication, reducing friction and preventing damage to the pump's moving parts. The other components mentioned, such as rotors, stators, and impellers, may also be present in an air refueling pump, but they do not specifically require fuel for lubrication.Rate this question:
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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 in an air refueling pump that removes fuel vapors caused by the centrifugal force of the impellers. The impellers create the centrifugal force, which pushes the fuel towards the outer edges of the pump. The rotor then captures and removes any fuel vapors that are generated during this process. This helps to ensure that the fuel being transferred is free from any vapors, which could potentially cause issues during the refueling process.Rate this question:
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- 49.
The arrow stamped on the body of a fuel system check valve indicates the
- A.
Direction of free flow.
- B.
Direction of restricted 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 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.Rate this question:
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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 valve is undesirable.
- D.
To prevent excessive pressures when the pump overspeeds
Correct Answer
C. When gravity flow through the valve is undesirable.Explanation
A pressure-loaded fuel system check valve is used when gravity flow through the valve is undesirable. This means that the valve is designed to prevent fuel from flowing back due to gravity when it is not desired. This could be the case when the fuel needs to be directed to a specific location or when the fuel flow needs to be regulated in a certain way. The valve ensures that the fuel only flows in the desired direction and prevents any backflow caused by gravity.Rate this question:
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Quiz Review Timeline +
Our quizzes are rigorously reviewed, monitored and continuously updated by our expert board to maintain accuracy, relevance, and timeliness.
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Current Version
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Mar 20, 2023Quiz Edited by
ProProfs Editorial Team -
Dec 03, 2013Quiz Created by
Skootermcgavin
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