CDC 2AX5X Volume 3
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The most prevalent method of refueling for ground servicing is
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Nozzle.
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Top-off.
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Single-point.
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Over-the-wing.
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The CDC 2AX5X Volume 3 quiz assesses knowledge on aircraft oxygen systems, covering natural oxygen properties, system valves, tubing identification, and oxygen regulators. It is crucial for professionals in aerospace and aircraft maintenance.
Quiz Preview
- 2.
At a minimum, what should you wear when taking an oil sample?
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Goggles.
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Goggles and gloves.
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Gloves and long sleeves.
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Goggles and long sleeves.
Correct Answer
A. Goggles and gloves.Explanation
When taking an oil sample, it is important to wear goggles and gloves. Goggles protect the eyes from any potential splashes or spills that may occur during the sampling process. Gloves, on the other hand, protect the hands from coming into direct contact with the oil, which may contain harmful chemicals or contaminants. Wearing both goggles and gloves ensures that the person taking the sample is adequately protected from any potential hazards.Rate this question:
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- 3.
The supply and distribution tubing for aircraft oxygen systems is identified by cellulose tape that is
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Brown and orange
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blue and yellow
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Green and white
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Black and red
Correct Answer
A. Green and whiteExplanation
The supply and distribution tubing for aircraft oxygen systems is identified by green and white cellulose tape. This color combination is used to distinguish the tubing from other systems in the aircraft. It helps maintenance personnel easily identify and locate the oxygen tubing for inspection, repair, or replacement. The green and white tape serves as a visual indicator and ensures that the oxygen system is properly maintained and serviced.Rate this question:
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- 4.
A liquid fire extinguishing agent douses a fire by
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Releasing a fine mist vapor.
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Excluding oxygen from the area.
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Removing nitrogen from the area.
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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 presence of oxygen, the fire is deprived of the fuel it needs to sustain itself. This effectively extinguishes the fire.Rate this question:
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- 5.
The arrow stamped on the body of a fuel system check valve indicates the
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Direction of free flow.
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Direction of restricted flow.
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Location of the drilled hole in the valve.
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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 fuel will flow in the direction that the arrow is pointing, allowing for proper functioning of the check valve. It is important to follow the direction of flow indicated by the arrow to ensure that the fuel system operates correctly and efficiently.Rate this question:
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- 6.
The disadvantage of a continuous-flow oxygen regulator is that it
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Wastes oxygen
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Is usable below 10,000 feet
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Is usable only above 20,000 feet
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Delivers oxygen at varying pressures
Correct Answer
A. Wastes oxygenExplanation
A continuous-flow oxygen regulator wastes oxygen because it delivers a constant flow of oxygen regardless of whether the user is inhaling or exhaling. This means that oxygen is being continuously released even when it is not being used by the individual, resulting in wastage.Rate this question:
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- 7.
What is usually located at the lowest point in a fuel tank?
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Sump and drain.
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Pump and drain.
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Pressure relief valve.
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Fuel-level control valve
Correct Answer
A. Sump and drain.Explanation
The sump and drain are usually located at the lowest point in a fuel tank. The sump is a reservoir that collects any sediment or water that may have accumulated in the tank. The drain is used to remove this accumulated sediment or water from the tank. This design ensures that any impurities or contaminants in the fuel settle at the bottom of the tank and can be easily drained out, preventing them from entering the fuel system and causing damage.Rate this question:
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- 8.
The two types of oil coolers used in jet engine oil systems are air/oil and
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Fuel/oil.
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Freon/oil.
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Water/oil.
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Hydraulic/oil.
Correct Answer
A. Fuel/oil.Explanation
The correct answer is fuel/oil. Jet engine oil systems use two types of oil coolers, which are air/oil and fuel/oil. The air/oil cooler cools the oil by passing it through a heat exchanger that is cooled by airflow. On the other hand, the fuel/oil cooler cools the oil by utilizing the cooler fuel as a heat sink. This helps in maintaining the oil temperature within acceptable limits and ensures efficient lubrication and cooling of the engine components.Rate this question:
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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
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Screwdriver
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Center punch.
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Rawhide mallet.
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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. The rawhide material is soft and non-damaging, allowing the user to tap the clamp into place without causing any damage or distortion to the ducting or clamp. This ensures a proper seal and alignment, preventing any air leakage or misalignment in the ducting system.Rate this question:
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- 10.
Fuel-controlled switches normally control circuits that indicate
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Fuel-flow.
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Fuel level.
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Fuel pressure.
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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 responsible for monitoring and regulating these parameters, providing important information to the operator or system. Therefore, the correct answer is "all of the above" as fuel-controlled switches control circuits that indicate fuel-flow, fuel level, and fuel pressure.Rate this question:
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- 11.
A well-designed aircraft fuel system will ensure
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Positive and negative fuel-flow.
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Negative fuel-flow under all conditions.
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Positive fuel-flow under positive conditions.
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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 needs to ensure a positive and reliable fuel-flow under all conditions. This means that the fuel system should consistently deliver fuel to the engine in a reliable manner, regardless of the operating conditions or external factors. The system should be designed to prevent any interruptions or fluctuations in the fuel-flow, ensuring a continuous and steady supply of fuel to the engine for optimal performance and safety.Rate this question:
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- 12.
In its natural state oxygen is?
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Tasteless, colorless, and odorless
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Tasteless, volumeless and odorless
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Tasteless, colorless, and Weightless
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Volumesless, weightless and colorless
Correct Answer
A. Tasteless, colorless, and odorlessExplanation
Oxygen in its natural state does not have a taste, color, or odor. This means that when oxygen is in its natural form, it cannot be detected by our senses of taste, sight, or smell.Rate this question:
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- 13.
“The simultaneous control of temperature, humidity, and air distribution within a space” is the definition of
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Engine bleed air.
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Air conditioning.
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Pressurization.
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Air control.
Correct Answer
A. Air conditioning.Explanation
Air conditioning refers to the simultaneous control of temperature, humidity, and air distribution within a space. This system is responsible for maintaining a comfortable and controlled environment by regulating the temperature and humidity levels, as well as ensuring proper air circulation. Engine bleed air refers to the extraction of compressed air from the engine for various purposes, pressurization refers to the process of maintaining a higher pressure inside a space compared to the surrounding environment, and air control is a vague term that does not specifically encompass all the aspects mentioned in the definition.Rate this question:
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- 14.
The rapid cooling of bleed air causes
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The air pressure to increase.
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Moisture to condense in the form of fog.
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Ice to form in the secondary heat exchanger.
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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. Therefore, the correct answer is that the rapid cooling of bleed air causes moisture to condense in the form of fog.Rate this question:
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- 15.
The low atmospheric pressure found at extremely high altitudes can cause a person’s blood vessels to
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Shrink.
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Rupture.
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Contract.
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Collapse.
Correct Answer
A. Rupture.Explanation
The low atmospheric pressure at extremely high altitudes can cause a person's blood vessels to rupture. When the atmospheric pressure decreases, the pressure inside the blood vessels becomes higher than the surrounding pressure. This pressure difference can lead to the rupture of blood vessels, especially the smaller ones. This can result in internal bleeding and other health complications.Rate this question:
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- 16.
What type of foreign particle appears in the fuel in a crystalline, granular, or glasslike form?
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Rust.
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Sand or dust
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Brass shavings.
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Aluminum or magnesium compounds.
Correct Answer
A. Sand or dustExplanation
Sand or dust particles can appear in fuel in a crystalline, granular, or glasslike form. These foreign particles can contaminate the fuel system and cause damage to the engine components. Sand or dust can enter the fuel through various means such as improper filtration, contaminated storage tanks, or during the refueling process. It is important to regularly inspect and clean the fuel system to prevent the presence of these particles and ensure the proper functioning of the engine.Rate this question:
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- 17.
What lubricant can be used on a beaded channel clamp sleeve to ease installation?
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Soap.
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Water
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Grease
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Silicone.
Correct Answer
A. 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 sleeve and the channel, making it easier to slide the sleeve into place. It is a common and easily accessible lubricant for this purpose.Rate this question:
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- 18.
A gaseous nitrogen charge is added to a liquid fire extinguishing agent in order to
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Convert the liquid to a gas upon discharge.
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Expel the agent from the bottle.
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Assist in extinguishing the fire.
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Stabilize the temperature.
Correct Answer
A. 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. This is because the pressure from the nitrogen gas builds up inside the bottle, causing the liquid agent to be forced out when the extinguisher is discharged. The expelled agent then acts to suppress the fire by smothering it or cooling it down, depending on the type of extinguishing agent used. The nitrogen charge is essential for propelling the agent out of the bottle effectively and efficiently.Rate this question:
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- 19.
The ability to do work is the definition of
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Energy
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Inertia.
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Friction.
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Velocity
Correct Answer
A. EnergyExplanation
Energy is defined as the ability to do work. It is the capacity of a system to perform tasks or exert force on another object. Energy can exist in various forms such as kinetic energy, potential energy, thermal energy, and so on. In this context, the correct answer is energy because it aligns with the definition provided. Inertia refers to an object's resistance to change in motion, friction is the force that opposes motion, and velocity is the rate of change of displacement.Rate this question:
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- 20.
Air and gases flowing through a jet engine require
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Low velocity at all times.
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Less velocity exiting than entering.
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Equal velocity entering and exiting.
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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 produce thrust. According to Newton's third law of motion, for every action, there is an equal and opposite reaction. As the air and gases are accelerated in the engine, they exert a force on the engine in the opposite direction, propelling the aircraft forward. To achieve this, the velocity of the air and gases exiting the engine must be greater than the velocity at which they entered. This ensures that the engine generates enough thrust to propel the aircraft forward.Rate this question:
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- 21.
After air is drawn into the guide vanes of a centrifugal jet engine compressor, it is subjected to
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Radial and tangential forces
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Rotational and tangential forces.
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Rotational and centrifugal forces.
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Mr. Harold Ballstein
Correct Answer
A. Rotational and centrifugal forces. -
- 22.
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?”
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Minor dent.
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Major dent.
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Scratch.
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Gouge.
Correct Answer
A. Major dent.Explanation
A major dent is defined as a depression in the duct wall that causes sharp bends or creases in the material, without cutting or removing the surface of the material. This suggests that the dent is significant and has caused noticeable damage to the material.Rate this question:
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- 23.
A bladder-type tank conforms to the shape of the vacant cavity within the fuselage because it is made out of
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Soft, malleable plastic.
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Rubber or nylon material.
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Hardened, pre-formed plastic.
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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. These materials can be molded and stretched to fit the available space, ensuring a tight and secure fit. Additionally, rubber and nylon are also flexible, which allows the tank to expand and contract as needed during changes in pressure or temperature.Rate this question:
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- 24.
How are fuel leaks categorized?
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Major and minor.
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Class 1 through 5.
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Class A through D.
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Internal and external.
Correct Answer
A. Class A through D.Explanation
Fuel leaks are categorized into Class A through D. This classification system helps in identifying the severity and potential danger of the fuel leak. Class A refers to the most severe leaks, which pose an immediate threat to life and property. Class D, on the other hand, represents the least severe leaks, which may not pose an immediate danger. This categorization allows for better prioritization and appropriate response measures to be taken based on the severity of the fuel leak.Rate this question:
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- 25.
Through the use of spectrometric oil analysis, aircraft will have a higher in-commission rate because there will be
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More oil sampling
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More engine removals.
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Less unnecessary maintenance.
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Less wear metal found in the oil.
Correct Answer
A. Less unnecessary maintenance.Explanation
Spectrometric oil analysis allows for more accurate monitoring of the oil in aircraft engines. This helps to identify potential issues early on, allowing for timely maintenance and reducing the likelihood of unnecessary maintenance. By detecting problems before they become major issues, aircraft can stay in commission for longer periods of time, resulting in a higher in-commission rate. Therefore, the correct answer is less unnecessary maintenance.Rate this question:
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- 26.
Liquid oxygen (LOX) converts to gaseous oxygen (GOX) at an expansion ratio of
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600 to 1
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680 to 1
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800 to 1
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860 to 1
Correct Answer
A. 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 to its gaseous form, it expands to 860 times its original volume. This expansion ratio is important in various applications where oxygen is used, such as rocket propulsion systems, as it allows for efficient storage and transportation of oxygen in its liquid state, which can then be easily converted to gas when needed.Rate this question:
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- 27.
Bleed air is usually taken from which part of the engine section?
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Intake
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Turbine
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Exhaust
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Compressor
Correct Answer
A. CompressorExplanation
Bleed air is usually taken from the compressor section of the engine. The compressor is responsible for compressing incoming air before it enters the combustion chamber. Bleed air is extracted from the compressor at various stages and is used for various purposes such as cabin pressurization, air conditioning, anti-icing, and hydraulic system operation. Extracting air from the compressor ensures that the air is at a high pressure and temperature, making it suitable for these applications.Rate this question:
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- 28.
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)?
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Primary heat exchanger.
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Air cycle machine.
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Water separator.
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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) by passing cold ram air through it. This process helps to regulate the temperature inside the aircraft and maintain a comfortable environment for passengers and crew. The primary heat exchanger acts as a radiator, dissipating the heat from the bleed air and cooling it down before it is circulated throughout the cabin.Rate this question:
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- 29.
A micron is a metric linear measurement equal toA micron is a metric linear measurement equal to
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1/25 of an inch
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1/25 of an inch
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1/2,500 of an inch.
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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 used to measure very small distances, typically in the field of microscopy. It is equal to 1/25,000 of an inch, which means that it is a very tiny unit of measurement. This makes it particularly useful for measuring objects at the microscopic level, where precision is crucial.Rate this question:
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- 30.
What do you use to create a static seal between two stationary parts in the oil system?
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Wadding
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Packing.
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Gasket.
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Filler
Correct Answer
A. Gasket.Explanation
A gasket is used to create a static seal between two stationary parts in the oil system. It is a mechanical seal that fills the gap between the two parts, preventing leakage of fluids or gases. Gaskets are commonly made of materials such as rubber, metal, or composite materials, and they are designed to withstand high temperatures and pressures. By providing a tight seal, gaskets ensure the proper functioning and efficiency of the oil system.Rate this question:
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- 31.
What is the basic purpose of the fuel vent system?
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Move fuel from tank to tank.
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Pressurize the fuel for transfer.
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Remove residual fuel from manifolds.
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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 allows the release of pressure that builds up inside the fuel tank due to temperature changes or fuel consumption. Without a properly functioning vent system, the pressure inside the tank could become too high, leading to potential damage or failure of the tank. By allowing the release of pressure, the vent system helps to maintain the structural integrity of the fuel tank and prevent any potential accidents or hazards.Rate this question:
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- 32.
Fuel’s ability to hold contaminants in suspension is increased with a higher
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Fuel to air ratio.
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Specific gravity.
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Temperature.
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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 it is thicker and more resistant to flow. This thicker fuel can effectively hold contaminants, such as dirt or particles, in suspension, preventing them from settling at the bottom of the fuel tank or clogging fuel filters. Therefore, a higher viscosity enhances the fuel's ability to keep contaminants suspended in the fuel system.Rate this question:
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- 33.
Classification of fuel leaks is necessary in order to determine
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How much fuel is being wasted.
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The type of contaminant that is in the fuel.
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Whether or not they constitute a flight safety hazard
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Whether or not they constitute an environmental hazard.
Correct Answer
A. Whether or not they constitute a flight safety hazardExplanation
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 pose significant risks to the safety of an aircraft and its passengers. By classifying the leaks, aviation authorities and maintenance personnel can assess the severity and potential consequences of the leaks, and take appropriate measures to mitigate the safety risks. This may involve repairing the leak, replacing faulty components, or grounding the aircraft until the issue is resolved.Rate this question:
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- 34.
What is the purpose of the exhaust duct?
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Swirl exhaust gas-flow
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Equalize exhaust gas-flow.
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Modulate exhaust gas-flow.
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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 gas can be directed more efficiently, reducing turbulence and improving overall performance. This helps to optimize the function of the exhaust system and ensure that the gas flows smoothly out of the system.Rate this question:
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- 35.
What type of fuel control uses thermocouples, relays, amplifiers, and solenoids, to help control the engine?
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Pneumatic.
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Fuel injection.
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Hydromechanical.
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Electrohydromechanical.
Correct Answer
A. Electrohydromechanical.Explanation
Electrohydromechanical fuel control uses a combination of electronic and hydraulic components to regulate the fuel flow in an engine. Thermocouples are used to measure temperature, relays are used to control electrical circuits, amplifiers are used to amplify electrical signals, and solenoids are used to control the flow of hydraulic fluid. This type of fuel control system offers precise control over the fuel flow, ensuring efficient and optimal engine performance. Pneumatic fuel control relies on air pressure, fuel injection uses injectors to deliver fuel, and hydromechanical fuel control uses mechanical components to regulate fuel flow, making them incorrect options.Rate this question:
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- 36.
Except during servicing, the liquid oxygen (LOX) system’s combination fill, buildup, and vent valve is always in the
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Fill position
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Vent position
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Normal position
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Buildup position
Correct Answer
A. 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 set to allow the buildup of pressure in the system. This position is necessary for the proper functioning of the LOX system and ensures that the required pressure is maintained during normal operation.Rate this question:
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- 37.
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
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An electroconductive sensor
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An Iron Fireman switch.
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A photoconductive cell.
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A FENWAL® switch.
Correct Answer
A. An Iron Fireman switch.Explanation
The correct answer is "an Iron Fireman switch." This is because an 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, which allows it to detect the presence of fire and trigger the necessary response.Rate this question:
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- 38.
What prevents a fuel tank from collapsing if an air pressure regulator fails and excessive negative pressure develops?
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Quick-disconnect valve.
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Fuel-level control valve.
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Low-level shutoff valve.
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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 remains at a safe pressure level. By opening when the pressure or vacuum exceeds a certain threshold, the relief valve prevents the tank from collapsing or becoming damaged.Rate this question:
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- 39.
The combustion efficiency of a gas turbine is usually between
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60 and 70 percent.
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65 and 75 percent.
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75 and 95 percent.
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95 and 100 percent.
Correct Answer
A. 95 and 100 percent.Explanation
The combustion efficiency of a gas turbine is typically between 95 and 100 percent. This means that the turbine is able to effectively convert the energy from the fuel into mechanical work. A high combustion efficiency indicates that there is minimal waste or unburned fuel, resulting in maximum utilization of the fuel's energy.Rate this question:
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- 40.
Fuel that accumulates after a failed start or after engine shutdown is
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Drained overboard by a drain system.
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Returned to the fuel control by tubes
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Burned on the next start attempt.
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Allowed to evaporate.
Correct Answer
A. Drained overboard by a drain system.Explanation
When fuel accumulates after a failed start or engine shutdown, it needs to be removed from the system. The correct answer states that the fuel is drained overboard by a drain system. This means that the excess fuel is removed from the engine and disposed of outside of the system. This is a common practice to ensure that the engine does not get flooded with excessive fuel and to prevent any potential damage or malfunction.Rate this question:
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- 41.
The purpose of a fuel/oil cooler in a fuel system is to
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Heat the fuel and cool the oil.
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Cool the fuel and cool the oil.
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Heat the fuel and heat the oil.
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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 and combust efficiently, while oil needs to be cooled to prevent it from overheating and breaking down. By heating the fuel and cooling the oil, the fuel/oil cooler helps to optimize the performance and longevity of the fuel system.Rate this question:
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- 42.
Expansion joints in bleed air systems are best used for
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Ram air ducting.
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A long run of ducting.
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A short run of ducting.
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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. Expansion joints are designed to absorb the thermal expansion and contraction that occurs in ducting systems due to temperature changes. They allow for the movement and flexibility of the ducting, preventing stress and damage. In a short run of ducting, the expansion and contraction are more pronounced, making expansion joints particularly necessary to accommodate these movements. In longer runs of ducting, the expansion and contraction are spread out over a larger area, reducing the need for expansion joints.Rate this question:
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- 43.
What controls the action of the outflow valve in a fixed-isobaric, single-differential pressurization system?
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A jet pump.
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Filtering cabin air.
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The unpressurized range.
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Regulating control chamber pressure.
Correct Answer
A. 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 opening and closing of the outflow valve, which regulates the cabin pressure. The other options, such as a jet pump, filtering cabin air, or the unpressurized range, do not directly control the action of the outflow valve in this type of pressurization system.Rate this question:
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- 44.
In a liquid-agent fire extinguisher container, why is the frangible disc undercut into pie-shaped sections?
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Break cleanly into small pieces.
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Allow undisturbed fluid flow through the system.
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Enable the pieces to pass easily through the strainer
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Prevent small pieces from passing through the strainer.
Correct Answer
A. Prevent small pieces from passing through the strainer.Explanation
The frangible disc in a liquid-agent fire extinguisher container is undercut into pie-shaped sections in order to prevent small pieces from passing through the strainer. By dividing the disc into sections, it ensures that even if the disc breaks, the pieces will be large enough to be caught by the strainer, preventing any small fragments from entering the system. This helps maintain the functionality and effectiveness of the fire extinguisher by ensuring that only the desired liquid agent flows through the system without any obstruction or contamination.Rate this question:
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- 45.
Wing tanks are
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Bladder-type tanks that conform to the vacant cavity within the wing.
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Lightweight, aluminum tanks inserted into empty wing cavities
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Sealed-off parts of the wing structure
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Soft, malleable plastic tanks.
Correct Answer
A. Sealed-off parts of the wing structureExplanation
The correct answer is "sealed-off parts of the wing structure." Wing tanks are compartments within the wings of an aircraft that are sealed off from the rest of the wing structure. They are used to store fuel and are designed to be airtight and secure. This ensures that the fuel remains contained within the wing and does not leak or pose a safety hazard.Rate this question:
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- 46.
Another name for the disc type valve in a fuel system is
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Butterfly.
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Swivel vane.
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Sliding gate.
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Swinging disc.
Correct Answer
A. Butterfly.Explanation
The correct answer is butterfly. A disc type valve in a fuel system is commonly known as a butterfly valve. This type of valve consists of a disc or plate that rotates around a shaft, resembling the wings of a butterfly. The disc can be positioned to control the flow of fuel, allowing it to open or close the passage. The term "butterfly" is used to describe this valve due to its resemblance to the insect's wings.Rate this question:
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- 47.
Some fuel level control valves have a dual-float system so that
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There will be a double safety factor.
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Two tanks can be filled at the same time.
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The tank can be filled to either of two levels.
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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 because it uses two floats to monitor the fuel level. This redundancy ensures that even if one float fails, the other will still function properly and prevent overfilling or underfilling of the tank. Having two floats increases the reliability and safety of the valve, making it an ideal choice for fuel level control systems.Rate this question:
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- 48.
Which type of fuel contaminant can form a red, brown, gray, or black slime in the fuel?
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Water.
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Sediment.
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Foreign particles
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Microbial growth.
Correct Answer
A. Microbial growth.Explanation
Microbial growth can form a red, brown, gray, or black slime in the fuel. Microbes such as bacteria and fungi can contaminate fuel and create a slimy substance. This growth occurs when water is present in the fuel, providing a suitable environment for microbes to thrive. The slime can clog filters, fuel lines, and injectors, leading to engine problems and reduced performance. Regular fuel maintenance and treatment with biocides can help prevent microbial growth and its associated issues.Rate this question:
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- 49.
Exhaust gas temperature (EGT) indicators indicate the engine EGT in
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British thermal units (BTU) per hour.
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Pounds per square inch (PSI).
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Degrees Fahrenheit.
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Degrees Celsius
Correct Answer
A. Degrees CelsiusExplanation
Exhaust gas temperature (EGT) indicators are used to measure the temperature of the engine's exhaust gases. The correct answer is degrees Celsius because Celsius is the commonly used unit for measuring temperature in most parts of the world, including the automotive industry. It is important to monitor the EGT as it can indicate the performance and efficiency of the engine, as well as help prevent damage or overheating.Rate this question:
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Mar 20, 2023Quiz Edited by
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Nov 17, 2014Quiz Created by
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