2A551 CDCs Volume 3 Of 3 Ure Questions Only

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  • 1/100 Questions

    Oxygen is described as being

    • Tasteless, colorless, and odorless
    • Tasteless, volumeless, and oderless
    • Tasteless, colorless, and weightless
    • Volumeless, weightless, and colorless
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2A551 CDCs Volume 3 Of 3 Ure Questions Only - Quiz
About This Quiz

This quiz assesses knowledge on jet engine mechanics, focusing on concepts like air temperature, air velocity, Newton's laws, and basic physics properties such as work and energy. It is designed for individuals preparing for the 2A551 CDCs Volume 3 certification, enhancing understanding of aerospace engineering principles.

Quiz Preview

  • 2. 

    You should not use mouth-suction to take jet engine oil samples because

    • This could cause paralysis or death

    • This could cause saliva contamination of the sample

    • There is a chance of dropping the tube into the oil tank

    • This may result in a mixture of sludge from the tank bottom

    Correct Answer
    A. This could cause paralysis or death
    Explanation
    Using mouth-suction to take jet engine oil samples is dangerous because it could cause paralysis or death. This method involves sucking the oil into the mouth, which can lead to the ingestion of harmful chemicals or substances present in the oil. These substances can cause severe health problems or even be fatal. Therefore, it is important to use proper sampling techniques and equipment to ensure the safety of the individual collecting the sample.

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  • 3. 

    The required velocity for air and gases flowing through a jet engine is

    • 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
    The correct answer is "greater velocity exiting than entering" because in a jet engine, the air and gases need to be accelerated to create thrust. This acceleration is achieved by increasing the velocity of the gases as they pass through the engine. As a result, the velocity of the gases exiting the engine is greater than the velocity at which they entered. This increase in velocity creates a force that propels the aircraft forward.

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  • 4. 

    The valve that permits jet engine oil flow in only one direction is the

    • Relief

    • Check

    • Bypass

    • Pressurizing

    Correct Answer
    A. Check
    Explanation
    The valve that permits jet engine oil flow in only one direction is the check valve. A check valve allows fluid to flow in one direction and prevents backflow. In the context of a jet engine, it ensures that oil flows in the correct direction to lubricate the engine components and prevents any reverse flow that could lead to damage or malfunction.

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  • 5. 

    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 scalar quantity that is associated with objects and systems and is measured in joules. Energy can exist in various forms such as kinetic energy, potential energy, thermal energy, and so on. It is the capacity of a system to perform work or transfer heat. In the context of this question, the correct answer is energy as it aligns with the definition provided.

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  • 6. 

    The most common contamination found in lubricant systems is

    • Dirt and sand

    • Grease and dirt

    • Sand and plastic

    • Plastic and grease

    Correct Answer
    A. Dirt and sand
    Explanation
    The most common contamination found in lubricant systems is dirt and sand. These particles can enter the system through various means such as air, water, or external sources. Dirt and sand can cause abrasion and wear on the components of the lubricant system, leading to reduced efficiency and potential damage. Regular maintenance and filtration are necessary to remove these contaminants and ensure the proper functioning of the lubricant system.

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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 the arrow shows the path through which the fuel can flow freely without any restrictions. It helps in ensuring that the fuel flows in the correct direction and prevents any backflow or blockages in the system.

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  • 8. 

    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 should ensure a positive and reliable fuel-flow under all conditions. This means that the system should consistently deliver fuel to the engine in a reliable manner, regardless of the operating conditions or any potential issues that may arise. It is important for the fuel system to maintain a positive flow of fuel to ensure that the engine receives the necessary fuel for proper operation. Additionally, the fuel-flow should be reliable to avoid any interruptions or failures in the fuel supply, which could lead to engine malfunctions or loss of power.

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  • 9. 

    A liquid fire extinguisher agent douses a fire by

    • Releasing a fine mist vapor

    • Releasing nitrogen into the area

    • Removing oxygen from the area

    • Dispersing a heavy concentration of liquid

    Correct Answer
    A. Removing oxygen from the area
    Explanation
    A liquid fire extinguisher agent douses a fire by removing oxygen from the area. When the liquid is sprayed onto the fire, it undergoes a process called vaporization, where it turns into a fine mist vapor. This vapor displaces the oxygen surrounding the fire, creating an oxygen-deficient environment. Since fire requires oxygen to sustain combustion, removing oxygen effectively extinguishes the fire. The other options, such as releasing nitrogen or dispersing a heavy concentration of liquid, may not be as effective in extinguishing the fire as removing oxygen.

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  • 10. 

    The disadvantage of a continuous-flow oxygen regulator is it

    • Wastes oxygen

    • Is unusable 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 a device used to regulate the flow of oxygen to a patient. The disadvantage of this type of regulator is that it wastes oxygen. This means that more oxygen is being delivered than is actually needed by the patient, resulting in unnecessary waste. This can be problematic, especially in situations where oxygen supply is limited or costly. Therefore, the wastage of oxygen is a significant drawback of a continuous-flow oxygen regulator.

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  • 11. 

    To create a static seal between two stationary parts in the oil system, use

    • Wadding

    • Packing

    • A gasket

    • A filler

    Correct Answer
    A. 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 typically made of materials such as rubber, metal, or composite materials that can withstand the pressure and temperature of the oil system. They are designed to provide a reliable and long-lasting seal, ensuring the proper functioning of the oil system.

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  • 12. 

    Aircraft engine indicating instruments must

    • Be light in weight and easy to calibrate

    • Operate on direct current (DC) and be small

    • Be light in weight, small in size, and easy to read

    • Operate on alternating current (AC) and be light in weight

    Correct Answer
    A. Be light in weight, small in size, and easy to read
    Explanation
    Aircraft engine indicating instruments need to be light in weight and small in size in order to minimize the overall weight and size of the aircraft, which is crucial for efficient and safe flight. Additionally, the instruments must be easy to read to ensure that pilots can quickly and accurately interpret the information provided by the instruments.

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  • 13. 

    The basic purpose of the fuel vent system is to

    • Move fuel from tank to tank

    • Pressurize the fuel for transfer

    • Remove residual fuel from manifolds

    • Prevent the rupture or collapse of the fuel tanks

    Correct Answer
    A. Prevent the rupture or collapse of the fuel tanks
    Explanation
    The fuel vent system is designed to prevent the rupture or collapse of the fuel tanks. This is important because fuel tanks can be subjected to various pressures and temperatures, which can cause them to expand or contract. If the tanks were to rupture or collapse, it could lead to fuel leakage or even explosions, posing a significant safety risk. The vent system allows for the release of excess pressure or vacuum inside the tanks, ensuring that they remain structurally intact and preventing any potential accidents.

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  • 14. 

    An aircraft taxiing at a constant speed is an example of

    • Bernoulli's Law

    • Newton's First Law of Motion

    • Newton's Second Law of Motion

    • Newton's Third Law of Motion

    Correct Answer
    A. Newton's First Law of Motion
    Explanation
    An aircraft taxiing at a constant speed is an example of Newton's First Law of Motion, also known as the law of inertia. According to this law, an object at rest or moving at a constant velocity will continue to do so unless acted upon by an external force. In this case, the aircraft maintains its speed and direction without any changes because there is no net force acting on it.

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  • 15. 

    The purpose of the exhaust duct is to

    • 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 exhaust gas-flow. This means that it is designed to remove any turbulence or irregularities in the flow of exhaust gases, ensuring that they flow in a straight and smooth manner. This is important for efficient and effective exhaust system operation, as straightening the flow helps to reduce back pressure and improve overall performance. Straightening the exhaust gas-flow also helps to minimize noise and improve the overall aesthetics of the exhaust system.

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  • 16. 

    The type of fuel control that uses items such as thermocouples, relays, amplifiers, and solenoids, to help control the engine is

    • Pneumatic

    • Fuel injection

    • Hydromechanical

    • Electrohydromechanical

    Correct Answer
    A. Electrohydromechanical
    Explanation
    Electrohydromechanical fuel control is the type of fuel control that utilizes various components such as thermocouples, relays, amplifiers, and solenoids to regulate and manage the engine. This type of system combines electrical and hydraulic mechanisms to achieve precise fuel control and optimize engine performance.

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  • 17. 

    During a visual inspection, how can you tell when a fuel filter is clogged?

    • A green flag pops out

    • Fuel pressure from the fuel pump is low

    • A differential pressure indicator is actuated

    • There is no way to tell without disassembling the filter

    Correct Answer
    A. A differential pressure indicator is actuated
    Explanation
    A differential pressure indicator is actuated when a fuel filter is clogged. This means that the pressure difference between the inlet and outlet of the filter becomes significant, triggering the indicator. This is a clear indication that the filter is obstructed and needs to be cleaned or replaced. It provides a visual or audible signal to alert the user that the filter is no longer functioning properly and requires attention.

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  • 18. 

    The minimum distance an aircraft should be parked from a hangar prior to a defueling operation is

    • 50 feet

    • 75 feet

    • 100 feet

    • 150 feet

    Correct Answer
    A. 50 feet
    Explanation
    The minimum distance an aircraft should be parked from a hangar prior to a defueling operation is 50 feet. This distance is necessary to ensure safety during the defueling process. It allows for enough space to prevent any potential accidents or mishaps that may occur during the operation. Keeping a safe distance minimizes the risk of fire or explosion, as well as any damage to the aircraft or the hangar itself. Therefore, 50 feet is the appropriate minimum distance for parking an aircraft before defueling.

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  • 19. 

    When installing air-conditioning ducting, the tool used to ensure alignment and sealing is the

    • 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 air-conditioning ducting because it is a soft-faced hammer that won't damage or dent the ducting material. The rawhide material absorbs the impact and provides a cushioned blow, allowing for precise alignment of the ducting components without causing any damage. Additionally, the rawhide mallet helps to create a tight seal between the ducting sections by applying even pressure, ensuring that there are no gaps or leaks in the system.

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  • 20. 

    The air-conditioning in a cargo aircraft uses a diverter valve to divert air to

    • The cooling turbine

    • The water separator

    • The flight station gaspers

    • Flight station and cargo compartments

    Correct Answer
    A. Flight station and cargo compartments
    Explanation
    The air-conditioning in a cargo aircraft uses a diverter valve to divert air to both the flight station and cargo compartments. This ensures that both areas are adequately cooled during the flight. The flight station requires a comfortable temperature for the pilots and crew to work efficiently, while the cargo compartments need to maintain a controlled temperature to protect the cargo being transported. By diverting air to both areas, the air-conditioning system can effectively meet the cooling needs of both the flight station and cargo compartments.

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  • 21. 

    A principle disadvantage of liquid fire extinguishing agents is they

    • Are extremely cold

    • Do not support combustion

    • Are poisonous of highly toxic

    • Require extremely heavy storage containers

    Correct Answer
    A. Are poisonous of highly toxic
    Explanation
    Liquid fire extinguishing agents are poisonous or highly toxic. This means that they can be harmful to humans and the environment if not handled properly. They may release toxic fumes or chemicals when used, posing a risk to individuals in the vicinity. Additionally, if these agents are not stored correctly, they can potentially leak or contaminate the surrounding area, causing further harm. Therefore, the toxicity of liquid fire extinguishing agents is a significant disadvantage that needs to be considered when using them.

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  • 22. 

    A steady red light on the fire emergency control handle in a liquid-agent fire extinguishing system indicates

    • An open fuel valve

    • Closed air valves

    • An overheat

    • A fire

    Correct Answer
    A. A fire
    Explanation
    A steady red light on the fire emergency control handle in a liquid-agent fire extinguishing system indicates a fire. This means that there is an active fire that requires immediate attention and action. The red light serves as a visual indicator to alert the user that there is a fire and that the fire extinguishing system has been activated or is ready to be activated.

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  • 23. 

    When the pressure in a T-handle liquid fire extinguisher container becomes too low,

    • The check valve will open

    • The check valve will close

    • The pressure switch will open

    • The light in the cockpit panel will glow

    Correct Answer
    A. The light in the cockpit panel will glow
    Explanation
    When the pressure in a T-handle liquid fire extinguisher container becomes too low, the light in the cockpit panel will glow. This indicates that the pressure is below the required level and the extinguisher may not function properly. The glowing light serves as a warning signal for the pilot or crew to take action and refill or replace the extinguisher to ensure its effectiveness in case of a fire emergency.

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  • 24. 

    The action of the outflow valve in a fixed-isobaric, single-differential pressurization system is controlled by

    • A jet pump

    • Filtering cabin air

    • The unpressurized range

    • Regulating control chamber pressure

    Correct Answer
    A. Regulating control chamber pressure
    Explanation
    The correct answer is regulating control chamber pressure. In a fixed-isobaric, single-differential pressurization system, the action of the outflow valve is controlled by regulating the pressure in the control chamber. This control chamber is responsible for maintaining the desired cabin pressure by adjusting the position of the outflow valve. By regulating the pressure in the control chamber, the system can ensure that the cabin pressure remains constant and at the desired level throughout the flight.

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  • 25. 

    At altitudes between 10,000 and 15,000 feet, the greatest danger from hypoxia is

    • A headache

    • A convulsion

    • Excessive fatigue

    • An error in judgement

    Correct Answer
    A. An error in judgement
    Explanation
    At altitudes between 10,000 and 15,000 feet, the greatest danger from hypoxia is an error in judgment. Hypoxia is a condition caused by a lack of oxygen in the body. At higher altitudes, the air becomes thinner and oxygen levels decrease. This can lead to impaired cognitive function, including poor decision-making and judgment. Therefore, the greatest danger in this situation is making critical errors in judgment that could have serious consequences.

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  • 26. 

    The average percentage of a jet engine's energy required to maintain engine operation is

    • 50

    • 60

    • 70

    • 80

    Correct Answer
    A. 60
    Explanation
    The correct answer is 60. This means that, on average, 60% of a jet engine's energy is needed to maintain engine operation. This suggests that a significant portion of the engine's power is used to keep it running efficiently, leaving the remaining energy to propel the aircraft forward.

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  • 27. 

    The purpose of an oil-temperature control valve used with air/oil coolers is to

    • Control oil poppet valve

    • Direct oil around fuel filter

    • Control oil exiting from cooler

    • Direct oil around or through cooler

    Correct Answer
    A. Direct oil around or through cooler
    Explanation
    The purpose of an oil-temperature control valve used with air/oil coolers is to direct oil around or through the cooler. This valve helps regulate the temperature of the oil by controlling its flow. By directing the oil either around or through the cooler, the valve ensures that the oil reaches the desired temperature for optimal performance and efficiency.

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  • 28. 

    On some jet engines, the turbine bucket is secured in place by

    • Screws

    • Cables

    • Lockwire

    • Lock strips

    Correct Answer
    A. Lock strips
    Explanation
    Lock strips are used to secure the turbine bucket in place on some jet engines. This method involves using strips that are tightly fitted and locked into position, preventing the bucket from moving or becoming dislodged during operation. Unlike screws, cables, or lockwire, lock strips provide a more secure and reliable means of fastening the turbine bucket.

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  • 29. 

    When trimming the exhaust gas temperature (EGT) of some jet engines, the nozzle area is changed by

    • Mice

    • Flaps

    • Seals

    • Segments

    Correct Answer
    A. Mice
  • 30. 

    What characteristic distinguishes the ejector-type fuel pump from other types of fuel pumps?

    • Is hydralically driven

    • Will operate without fuel

    • Contains no moving parts

    • Is activated by an electrical motor

    Correct Answer
    A. Contains no moving parts
    Explanation
    The characteristic that distinguishes the ejector-type fuel pump from other types of fuel pumps is that it contains no moving parts. Unlike other fuel pumps that rely on mechanical components to pump fuel, the ejector-type fuel pump uses the Venturi effect to create a pressure difference and draw fuel into the system. This design eliminates the need for any moving parts, making the ejector-type fuel pump more reliable and less prone to wear and tear.

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  • 31. 

    Another name for the disc type valve in a fuel system is

    • Butterfly

    • Swivel vane

    • Sliding gate

    • Swinging disc

    Correct Answer
    A. Butterfly
    Explanation
    The correct answer is butterfly. The disc type valve in a fuel system is commonly referred to as a butterfly valve. This type of valve consists of a disc that rotates on a shaft to control the flow of fuel. The disc is shaped like a butterfly, hence the name.

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  • 32. 

    All of the following aircraft systems use engine bleed air (EBA) except

    • Anti-icing

    • Rain removal

    • Air-conditioning

    • Fire extinguishing

    Correct Answer
    A. Fire extinguishing
    Explanation
    Engine bleed air (EBA) is used in various aircraft systems for different purposes. Anti-icing systems use EBA to prevent ice formation on critical surfaces of the aircraft. Rain removal systems also utilize EBA to clear the windshield and other windows of rainwater. Air-conditioning systems use EBA to regulate the temperature and pressurization within the aircraft cabin. However, fire extinguishing systems do not require EBA as they use specialized agents or substances to suppress and extinguish fires on board the aircraft.

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  • 33. 

    A depression in the duct wall, wherein the surface of the material isn't cut or removed but the depression has caused sharp bends or creases in the material, is the definition of a

    • Scratch

    • Minor dent

    • Major dent

    • Gouge

    Correct Answer
    A. Major dent
    Explanation
    A major dent refers to a depression in the duct wall that has caused sharp bends or creases in the material, without cutting or removing the surface of the material.

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  • 34. 

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

    • Nitrogen

    • 16 man-minutes of oxygen

    • 93 percent oxygen-enriched gas

    • 100 percent oxygen-enriched gas

    Correct Answer
    A. 93 percent oxygen-enriched gas
    Explanation
    The molecular sieve oxygen generating system (MSOGS) concentrator supplies 93 percent oxygen-enriched gas to the OXYGEN regulator control panel. This means that the gas produced by the MSOGS concentrator is mostly oxygen, with a concentration of 93 percent. This level of oxygen-enrichment is suitable for various medical and industrial applications where a high concentration of oxygen is required.

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  • 35. 

    The characteristic of the fluid used in a liquid coolant system (LCS) that makes it suitable as a coolant for electronic components is its

    • Viscosity

    • Resistance

    • Metallic content

    • Nonconductance

    Correct Answer
    A. Nonconductance
    Explanation
    The characteristic of the fluid used in a liquid coolant system (LCS) that makes it suitable as a coolant for electronic components is its nonconductance. This means that the fluid does not conduct electricity, which is important in preventing any electrical short circuits or damage to the electronic components. By using a nonconducting coolant, the risk of electrical damage is minimized, ensuring the safe and efficient cooling of the electronic components in the LCS.

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  • 36. 

    The percentage of combustion efficiency of a gas turbine is usually between

    • 60 and 70

    • 65 and 75

    • 75 and 95

    • 95 and 100

    Correct Answer
    A. 95 and 100
    Explanation
    The percentage of combustion efficiency of a gas turbine is usually between 95 and 100. This means that the turbine is able to convert a high percentage of the fuel's energy into useful work, with minimal energy losses through combustion. A combustion efficiency in this range indicates that the turbine is operating at a high level of efficiency and is effectively utilizing the fuel to generate power.

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  • 37. 

    The most chemically correct ratio for burning fuel in a combustion chamber is

    • 10:1

    • 10:4

    • 15:1

    • 15:4

    Correct Answer
    A. 15:1
    Explanation
    The most chemically correct ratio for burning fuel in a combustion chamber is 15:1. This ratio indicates that for every 15 units of air, 1 unit of fuel is required for complete combustion. This ratio ensures that there is enough oxygen present to fully oxidize the fuel, resulting in efficient and clean combustion. A higher fuel-to-air ratio would result in a fuel-rich mixture, leading to incomplete combustion and the release of pollutants. Conversely, a lower ratio would result in excess air, reducing the efficiency of combustion. Therefore, a ratio of 15:1 strikes the right balance for optimal combustion.

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  • 38. 

    The inner and outer surfaces of an annular-type combustion chamber are formed by

    • Interlocking stainless steel bands

    • The inner and outer diffuser case

    • A forged steel casing

    • Solid sheet metal

    Correct Answer
    A. Interlocking stainless steel bands
    Explanation
    The correct answer is interlocking stainless steel bands. The use of interlocking stainless steel bands for the inner and outer surfaces of an annular-type combustion chamber provides a strong and secure construction. The interlocking design ensures that the bands fit together tightly, creating a durable and reliable structure. Stainless steel is chosen for its high strength and heat resistance properties, making it suitable for withstanding the extreme conditions of a combustion chamber. This design allows for efficient combustion and containment of the combustion process within the chamber.

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  • 39. 

    The Hamilton Standard 54H60-91 propeller is a

    • Three-bladed, reversible-pitch propeller; 13.5 feet in diameter

    • Three-bladed, reversible-pitch propeller; 15.5 feet in diameter

    • Four-bladed, reversible-pitch propeller; 13.5 feet in diameter

    • Four-bladed, reversible-pitch propeller; 15.5 feet in diameter

    Correct Answer
    A. Four-bladed, reversible-pitch propeller; 13.5 feet in diameter
    Explanation
    The correct answer is "four-bladed, reversible-pitch propeller; 13.5 feet in diameter." This is because the Hamilton Standard 54H60-91 propeller is described as having four blades and a reversible-pitch mechanism, meaning the angle of the propeller blades can be adjusted to control the aircraft's thrust. Additionally, the propeller has a diameter of 13.5 feet, which refers to the length of the circular path traced by the propeller blades.

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  • 40. 

    A method of de-icing a propeller is to use

    • Bleed air

    • De-icing solution

    • Electrically heated elements

    • Exhaust air from the H-1 heater

    Correct Answer
    A. Electrically heated elements
    Explanation
    Electrically heated elements are used as a method of de-icing a propeller. These elements are designed to generate heat when an electric current passes through them, which is then used to melt any ice or frost that has formed on the propeller blades. This method is effective in quickly and efficiently removing ice and ensuring safe operation of the propeller. Bleed air, de-icing solution, and exhaust air from the H-1 heater are not mentioned as methods of de-icing a propeller in the given options.

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  • 41. 

    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 Joint Oil Analysis Program (JOAP) provides three benefits, one of which is increased equipment availability. This means that by participating in JOAP, organizations can ensure that their equipment is readily available for use, minimizing downtime and maximizing productivity. This benefit is crucial in industries where equipment downtime can result in significant financial losses. By monitoring oil analysis through JOAP, organizations can identify potential issues or failures in equipment early on, allowing for timely maintenance and repairs, thus increasing equipment availability.

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  • 42. 

    Foot-pounds and inch-pounds are units of measure for

    • Work

    • Power

    • Inertia

    • Friction

    Correct Answer
    A. Work
    Explanation
    Foot-pounds and inch-pounds are units of measure commonly used to quantify work. Work is defined as the transfer of energy that occurs when a force is applied to an object and it moves in the direction of the force. The units of foot-pounds and inch-pounds represent the amount of work done when a force of one pound is applied over a distance of one foot or one inch, respectively. Therefore, these units are specifically used to measure the amount of work done in mechanical systems.

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  • 43. 

    A jet engine derives its name from the fact that

    • It is in effect a turbo-supercharger

    • The nozzles within the engine are called jets

    • It uses a turbine-type compressor to maintain power

    • It uses a exhaust-gas-driven turbine wheel to drive its compressor

    Correct Answer
    A. It uses a exhaust-gas-driven turbine wheel to drive its compressor
    Explanation
    A jet engine derives its name from the fact that it uses an exhaust-gas-driven turbine wheel to drive its compressor. This means that the engine uses the force of the exhaust gases to spin a turbine, which in turn powers the compressor. The compressor then compresses incoming air, which is mixed with fuel and ignited to create a high-pressure, high-velocity jet of exhaust gases. This jet of gases propels the aircraft forward, providing thrust. Therefore, the name "jet engine" is derived from the use of the exhaust gases to drive the turbine and compressor, which is the key mechanism of the engine.

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  • 44. 

    The condition that rapidly reduces the efficiency of a centrifugal jet engine compressor would be

    • Resultant velocity

    • Tangential velocity

    • Pressure pulsations

    • Air mass leaving the impeller at great velocities

    Correct Answer
    A. Pressure pulsations
    Explanation
    Pressure pulsations can rapidly reduce the efficiency of a centrifugal jet engine compressor. These pressure fluctuations can cause disturbances in the flow of air, leading to turbulence and inefficiencies in the compressor's operation. This can result in decreased performance and increased energy consumption. Therefore, pressure pulsations are a critical factor to consider in maintaining the efficiency of a centrifugal jet engine compressor.

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  • 45. 

    Pressurization of the engine fuel system is controlled by the

    • N2 sensor

    • T2.5 sensor

    • Fuel nozzles

    • Pressurizing and dump (P&D) valve

    Correct Answer
    A. Pressurizing and dump (P&D) valve
    Explanation
    The pressurization of the engine fuel system is controlled by the pressurizing and dump (P&D) valve. This valve is responsible for regulating the pressure of the fuel system by increasing or decreasing the flow of fuel. It ensures that the fuel is delivered to the engine at the correct pressure for optimal performance. The P&D valve also allows for the dumping of excess fuel from the system, preventing over-pressurization and potential damage to the engine.

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  • 46. 

    The oil cooler that operates on the same principle as an automotive radiator is the

    • Air/oil

    • Fuel/oil

    • Water/oil

    • Hydraulic/oil

    Correct Answer
    A. Air/oil
    Explanation
    The correct answer is air/oil because an air/oil cooler operates on the same principle as an automotive radiator. In this type of cooler, air is used to cool the oil, similar to how air is used to cool the coolant in a car radiator. The air/oil cooler consists of fins or tubes that allow the oil to flow through them while air passes over them, dissipating the heat from the oil. This helps to maintain the optimal temperature of the oil and prevent overheating.

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  • 47. 

    Bleed air system water separators remove 70 to 85 percent of moisture that accumulates in the conditioned air.  This is a result of

    • Rapid expansion

    • Regulated airflow

    • Internal compression

    • Regulated air pressure

    Correct Answer
    A. Rapid expansion
    Explanation
    The correct answer is rapid expansion. When air is rapidly expanded, its temperature decreases. This causes the moisture in the air to condense and form droplets, which can then be separated and removed by the water separators in the bleed air system.

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  • 48. 

    It is important to raise the air temperature in a jet engine to

    • Increase its energy

    • Decrease its energy

    • Decrease its volume

    • Increase its efficiency

    Correct Answer
    A. Increase its energy
    Explanation
    Raising the air temperature in a jet engine increases its energy because it allows for better combustion of fuel. When the air temperature is increased, the fuel burns more efficiently, resulting in a higher energy output. This increase in energy improves the overall performance of the jet engine, allowing it to generate more thrust and power. Therefore, increasing the air temperature is crucial for maximizing the energy output of the engine.

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  • 49. 

    The resistance of an object to change its motion is a property of matter called

    • Energy

    • Inertia

    • Friction

    • Potential

    Correct Answer
    A. Inertia
    Explanation
    Inertia is the property of matter that describes its resistance to change in motion. It is the tendency of an object to remain in its current state of motion, whether it is at rest or moving at a constant velocity. This resistance to change in motion is a fundamental characteristic of matter and is not related to energy, friction, or potential.

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Quiz Review Timeline (Updated): Mar 19, 2023 +

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

  • Current Version
  • Mar 19, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • May 11, 2011
    Quiz Created by
    Beede1984
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