2A6X1 Vol. 2 Ure's (Mfe)
Engines eoc study guide
Questions and Answers
- 1.
"An unbalanced foce ona body produces or tends to produce an acceleration in the direction of the force and that the acceleration, if any, is directly proportional to the force and inversely proportional to the mass of the body" This statement is
- A.
Bernoulli's principle
- B.
Newton's first law of motion
- C.
Newton's second law of motion
- D.
Newton's third law of motion
Correct Answer
C. Newton's second law of motionExplanation
The given statement describes Newton's second law of motion. According to this law, an unbalanced force acting on an object will cause the object to accelerate in the direction of the force. The acceleration is directly proportional to the force applied and inversely proportional to the mass of the object. This law is commonly expressed as F = ma, where F is the force, m is the mass, and a is the acceleration.Rate this question:
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- 2.
Which type of duct would decrease the velocity and increase the pressure of a gas as it passes through?
- A.
Elbow
- B.
Straight
- C.
Divergent
- D.
Convergent
Correct Answer
C. DivergentExplanation
A divergent duct is designed to gradually increase in size, causing the gas to expand and slow down as it passes through. This expansion leads to a decrease in velocity and an increase in pressure.Rate this question:
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- 3.
"The combination of a decreased pressure above an airfoil, and the increased pressure below the airfoil produces lift" ids best described by
- A.
Bernoulli's principle
- B.
Newton's first law of motion
- C.
Newton's second law of motion
- D.
Newton's third law of motion
Correct Answer
A. Bernoulli's principleExplanation
According to Bernoulli's principle, as the speed of a fluid (such as air) increases, its pressure decreases. In the case of an airfoil, the curved shape of the upper surface causes the air to travel faster, resulting in lower pressure above the airfoil. At the same time, the flat bottom surface of the airfoil causes the air to travel slower, resulting in higher pressure below the airfoil. This pressure difference creates an upward force, known as lift, which allows the airfoil to generate upward motion. Therefore, Bernoulli's principle best describes the combination of decreased pressure above an airfoil and increased pressure below the airfoil producing lift.Rate this question:
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- 4.
The tendency of an object at rest to remain at rest and the tendency of an object in motion to continue in motion in a straight line at the same speed is called
- A.
Energy
- B.
Inertia
- C.
Friction
- D.
Potential
Correct Answer
B. InertiaExplanation
Inertia is the correct answer because it refers to the tendency of an object to resist changes in its state of motion. An object at rest will remain at rest, and an object in motion will continue moving in a straight line at a constant speed unless acted upon by an external force. This property of inertia is a fundamental concept in physics and helps explain various phenomena in the physical world.Rate this question:
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- 5.
Which section of a jet engine introduces and burns fuel?
- A.
Turbine
- B.
Diffuser
- C.
Compressor
- D.
Combustion
Correct Answer
D. CombustionExplanation
The section of a jet engine that introduces and burns fuel is the combustion section. This is where the fuel is mixed with air and ignited, creating a high-temperature and high-pressure gas that expands and provides the necessary thrust to propel the aircraft forward. The combustion section is crucial in converting the potential energy of the fuel into kinetic energy, which powers the engine and allows the aircraft to fly.Rate this question:
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- 6.
Which section of a jet engine keeps the compressor rotating?
- A.
Turbine
- B.
Exhaust
- C.
Diffuser
- D.
Combustion
Correct Answer
A. TurbineExplanation
The turbine section of a jet engine keeps the compressor rotating. The turbine is connected to the compressor by a shaft, and as the hot gases from the combustion process pass through the turbine, they cause the turbine blades to rotate. This rotational energy is then transferred to the compressor, which keeps it spinning and allows it to continue compressing air for the combustion process. The turbine plays a crucial role in maintaining the continuous flow of air and fuel through the engine, making it an essential component for the engine's operation.Rate this question:
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- 7.
Which method of producing thrust does a turboprop engine use?
- A.
Accelerating a large mass of air by a small amount
- B.
Moving a small quantity of air through a large velocity change.
- C.
Using the same working fluid for propulsive force as that used within the engine
- D.
Using only the energy expended through the exhaust nozzle to propel the aircraft forward
Correct Answer
A. Accelerating a large mass of air by a small amountExplanation
A turboprop engine uses the method of accelerating a large mass of air by a small amount to produce thrust. This is achieved by using a gas turbine engine to drive a propeller, which in turn accelerates a large quantity of air behind it. By accelerating a large mass of air by a small amount, the engine is able to generate the necessary thrust to propel the aircraft forward efficiently.Rate this question:
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- 8.
Which type of horsepower is delivered to the propeller for useful work?
- A.
Brake
- B.
Indicated
- C.
Frictional
- D.
Equivalent shaft
Correct Answer
A. BrakeExplanation
Brake horsepower is the type of horsepower that is delivered to the propeller for useful work. Brake horsepower refers to the actual power output of an engine or motor, measured at the output shaft. It represents the power available to do useful work, such as turning the propeller in this case, after accounting for any losses due to friction or other inefficiencies.Rate this question:
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- 9.
The heat content per pound of kerosene is how many BTU's?
- A.
10,500
- B.
15,500
- C.
18,500
- D.
40,000
Correct Answer
C. 18,500Explanation
Kerosene has a heat content of 18,500 BTU's per pound. This means that when one pound of kerosene is burned, it releases 18,500 BTU's of heat energy.Rate this question:
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- 10.
To measure barometric pressure, you would use a
- A.
Potentiometer
- B.
Psychrometer
- C.
Pyrometer
- D.
Barometer
Correct Answer
D. BarometerExplanation
A barometer is used to measure barometric pressure. Barometric pressure refers to the pressure exerted by the atmosphere at a particular location. A barometer typically consists of a glass tube filled with mercury or aneroid cells that expand or contract based on atmospheric pressure. By measuring the changes in the height of the mercury column or the movement of the aneroid cells, the barometer can provide an accurate reading of the atmospheric pressure. This information is important for weather forecasting, as changes in barometric pressure often indicate upcoming weather patterns.Rate this question:
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- 11.
What is the sea-level atmosperic pressure at "standard day" conditions?
- A.
13.5 psi
- B.
14.7 psi
- C.
49.94 psi
- D.
40.55 psi
Correct Answer
B. 14.7 psiExplanation
The sea-level atmospheric pressure at "standard day" conditions is 14.7 psi. Atmospheric pressure is the force exerted by the weight of the air above a given point. At sea level, the average atmospheric pressure is about 14.7 pounds per square inch (psi). This value is considered the standard atmospheric pressure and is used as a reference point for measuring pressure at different altitudes.Rate this question:
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- 12.
What effect does the divergent design of a diffuser have on air pressure?
- A.
Increases pressure
- B.
Decreases pressure
- C.
Has no effect on pressure
- D.
Results in pressure fluctuations
Correct Answer
A. Increases pressureExplanation
The divergent design of a diffuser increases air pressure. A diffuser is a device that gradually expands the flow area of a fluid, in this case, air. As the air flows through the divergent section of the diffuser, the cross-sectional area increases, causing the air to slow down. According to Bernoulli's principle, when the velocity of a fluid decreases, its pressure increases. Therefore, the divergent design of a diffuser increases air pressure.Rate this question:
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- 13.
Which engine component meters fuel for combustion?
- A.
P&D valve
- B.
Fuel pump
- C.
Fuel control
- D.
Fuel nozzles
Correct Answer
C. Fuel controlExplanation
The fuel control is responsible for metering fuel for combustion in an engine. It regulates the flow of fuel to ensure the correct fuel-to-air ratio for efficient combustion. This component plays a crucial role in controlling the engine's performance and optimizing fuel efficiency. The P&D valve, fuel pump, and fuel nozzles are also important components in the fuel system, but they do not specifically meter fuel for combustion like the fuel control does.Rate this question:
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- 14.
What directs the gases onto the first-stage turbine wheel blades in a jet engine?
- A.
Flameholder
- B.
Combustion chamber
- C.
Turbine wheel blades
- D.
Turbine stator
Correct Answer
D. Turbine statorExplanation
The turbine stator directs the gases onto the first-stage turbine wheel blades in a jet engine. The turbine stator is a stationary component that is located between the combustion chamber and the turbine wheel blades. Its primary function is to guide and direct the flow of gases onto the turbine blades, ensuring efficient energy transfer and power generation.Rate this question:
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- 15.
When two or more turbine wheels are used in a jet engine, which component is placed directly in front of each turbine wheel?
- A.
Diffuser
- B.
Jet nozzle
- C.
Combustion chamber
- D.
Turbine stator(nozzle diaphragm
Correct Answer
D. Turbine stator(nozzle diaphragmExplanation
The turbine stator (nozzle diaphragm) is placed directly in front of each turbine wheel when two or more turbine wheels are used in a jet engine. The turbine stator is responsible for directing the flow of gases onto the turbine blades, ensuring efficient energy transfer and power generation. It helps to control the speed and pressure of the gases, optimizing the performance of the turbine wheels.Rate this question:
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- 16.
Three major sections of all jet engines are compressor, combustion, and
- A.
Turbo
- B.
Turbine
- C.
Exhaust
- D.
Diffuser
Correct Answer
B. TurbineExplanation
The turbine is the correct answer because it is one of the three major sections of all jet engines, along with the compressor and combustion sections. The turbine is responsible for extracting energy from the high-velocity gas flow produced by the combustion section and converting it into mechanical energy to drive the compressor and other engine components. It is located after the combustion section and before the exhaust section in the engine's flow path.Rate this question:
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- 17.
Vane-type fuel pumps used in jet engines are similar to
- A.
Sliding-vane air compressors
- B.
Piston pump air compressors
- C.
Roots air compressors
- D.
Turbo-superchargers
Correct Answer
A. Sliding-vane air compressorsExplanation
Vane-type fuel pumps used in jet engines are similar to sliding-vane air compressors. Both types of pumps use a set of vanes that slide in and out of slots in a rotor to create a seal and move fluid or air. This design allows for efficient and reliable pumping, as the vanes create a positive displacement action. The sliding-vane air compressor is a suitable comparison as it operates on the same principle, using vanes to compress air instead of pumping fuel. The other options, piston pump air compressors, roots air compressors, and turbo-superchargers, do not share the same design or operation as vane-type fuel pumps.Rate this question:
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- 18.
The two forces that air is subjected to after it is drawn into the gude vanes of a centrifugal compressor are
- A.
Rotational and centrifugal
- B.
Rotational and tangential
- C.
Tangential and centrifugal
- D.
Tangential and radial
Correct Answer
A. Rotational and centrifugalExplanation
After air is drawn into the guide vanes of a centrifugal compressor, it experiences two forces: rotational and centrifugal. The rotational force is caused by the spinning motion of the compressor impeller, which imparts a swirling motion to the air. The centrifugal force is a result of the air being pushed outward due to the high-speed rotation of the impeller. These two forces work together to compress the air and increase its pressure before it is discharged from the compressor.Rate this question:
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- 19.
A constructional feature of the centrifugal compressor is that the impeller
- A.
Has two matching plates
- B.
Has a lightweight design
- C.
Is a forged single unit
- D.
Is constructed in rows of blades and stators
Correct Answer
C. Is a forged single unitExplanation
The correct answer is "is a forged single unit." This means that the impeller of the centrifugal compressor is made as a single piece through the process of forging. This constructional feature ensures that the impeller is strong and durable, as it eliminates any weak points or joints that could potentially fail under high-speed rotation. By being a single unit, the impeller can efficiently convert the kinetic energy of the rotating blades into pressure energy, resulting in an effective compression process.Rate this question:
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- 20.
The forward end of the shaft on a centrifugal compressor is hollow in order to
- A.
Act as a vibation damper
- B.
Allow cooling air to the turbine
- C.
Provide a passage for lubricating oil
- D.
Provide a passage for the main fuel supply
Correct Answer
D. Provide a passage for the main fuel supplyExplanation
The forward end of the shaft on a centrifugal compressor is hollow in order to provide a passage for the main fuel supply. This allows the fuel to flow through the shaft and reach the combustion chamber of the compressor, where it can be ignited to generate power. The hollow shaft acts as a conduit for the fuel, ensuring a smooth and uninterrupted flow from the fuel source to the combustion chamber.Rate this question:
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- 21.
Stationary vanes positioned between rotor discs in a compressor are used to
- A.
Direct air and increase pressure
- B.
Direct hot gases rearward
- C.
Increase backup pressure
- D.
Prolong compressor life
Correct Answer
A. Direct air and increase pressureExplanation
The stationary vanes positioned between rotor discs in a compressor are used to direct air and increase pressure. These vanes serve to guide the airflow and redirect it in a specific direction, ensuring that the air is efficiently compressed and the pressure is increased. By controlling the airflow, the vanes help optimize the compressor's performance and enhance its overall efficiency.Rate this question:
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- 22.
In a dual-spool compressor, rpm o the N2 compressor are determined by the
- A.
Starter
- B.
Fuel pump
- C.
Fuel control
- D.
Low-pressure turbine
Correct Answer
C. Fuel controlExplanation
In a dual-spool compressor, the rpm of the N2 compressor is determined by the fuel control. The fuel control regulates the amount of fuel being supplied to the engine, which in turn affects the speed of the N2 compressor. By adjusting the fuel flow, the fuel control can control the speed of the N2 compressor and maintain optimal engine performance.Rate this question:
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- 23.
Which facet of engine design helps prevent igniter plug fouling?
- A.
Gold plating on the plug
- B.
Split electrode on the plug
- C.
Ceramic coating on the plug
- D.
Directing air around the plug
Correct Answer
D. Directing air around the plugExplanation
Directing air around the plug helps prevent igniter plug fouling. By directing air around the plug, any deposits or contaminants that may accumulate on the plug are blown away, reducing the chances of fouling. This ensures that the plug remains clean and functional, allowing for efficient ignition of the engine. Gold plating on the plug, split electrode on the plug, and ceramic coating on the plug may have other benefits in engine design, but they do not specifically address the prevention of igniter plug fouling.Rate this question:
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- 24.
The excess airflow that is not burned in the combustion section is used to
- A.
Cool the burner surfaces
- B.
Operate pneumatic accessories
- C.
Decrease the mass of exhaust gases
- D.
Increase air in compressor section
Correct Answer
A. Cool the burner surfacesExplanation
The excess airflow that is not burned in the combustion section is used to cool the burner surfaces. This is necessary because the combustion process generates high temperatures, and if the burner surfaces are not cooled, they can become damaged or even melt. By using the excess airflow for cooling, the burner surfaces can maintain a safe temperature and continue to function properly.Rate this question:
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- 25.
Fuel that accumulates after a failed start is
- A.
Returned to the fuel control by tubes
- B.
Drained overboard by a drain system
- C.
Burned on the next start attempt
- D.
Allowed to evaporate
Correct Answer
B. Drained overboard by a drain systemExplanation
After a failed start, the fuel that accumulates is drained overboard by a drain system. This is done to prevent the fuel from causing any damage or malfunction in the fuel control system. By draining the fuel overboard, any potential hazards or risks are eliminated, ensuring the safety and proper functioning of the system.Rate this question:
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- 26.
The parts on a can-annular combustion section must be removed in a specific order because of the
- A.
Fuel nozzle
- B.
Transition liner
- C.
Combustion chamber outer case
- D.
Combustion chamber cross over tubes
Correct Answer
D. Combustion chamber cross over tubesExplanation
The correct answer is "combustion chamber cross over tubes". The combustion chamber cross over tubes are responsible for directing the flow of hot gases from one combustion chamber to another. They play a crucial role in maintaining the proper flow and distribution of fuel and air mixture within the combustion section. Therefore, they need to be removed in a specific order to ensure that the combustion process is not disrupted and the engine operates efficiently.Rate this question:
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- 27.
What is the most common type of fuel nozzle system?
- A.
Pressure-atomizing
- B.
Fuel-blasting
- C.
Fuel ejector
- D.
Fuel tube
Correct Answer
A. Pressure-atomizingExplanation
The most common type of fuel nozzle system is the pressure-atomizing system. This system uses high pressure to atomize the fuel into fine particles, allowing for efficient combustion. It is widely used in various applications, including gas turbines, industrial burners, and oil-fired boilers. The pressure-atomizing system ensures proper fuel distribution and combustion control, making it a popular choice in many industries.Rate this question:
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- 28.
Swirl-type fuel nozzles usually are used to provide what type of flame speed?
- A.
Low
- B.
High
- C.
Medium
- D.
Medium-high
Correct Answer
B. HighExplanation
Swirl-type fuel nozzles are designed to provide a high flame speed. The swirling motion of the fuel and air mixture enhances the mixing and combustion process, resulting in a faster and more efficient flame propagation. This high flame speed is beneficial in applications where quick and complete combustion is desired, such as in gas turbines or industrial burners.Rate this question:
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- 29.
Three types of turbine and vane assemblies used in jet engines are impulse, reaction, and
- A.
Fir tree
- B.
Shrouded
- C.
Unshrouded
- D.
Reaction-impulse
Correct Answer
D. Reaction-impulseExplanation
The correct answer is reaction-impulse. In jet engines, turbine and vane assemblies are used to convert the energy from the hot gases into mechanical energy to drive the compressor and other components. Impulse turbines work by the force of the gas jets impacting the turbine blades, while reaction turbines work by the pressure difference between the gas jets entering and leaving the turbine. However, there are also turbines that combine both impulse and reaction principles, known as reaction-impulse turbines. These turbines utilize both the impact force and the pressure difference to generate mechanical energy efficiently.Rate this question:
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- 30.
What is placed in front of the rotating blades in an engine turbine section?
- A.
Rotating vanes
- B.
Inlet guide vanes
- C.
Turbine rotating nozzles
- D.
Turbine nozzle vane assembly
Correct Answer
D. Turbine nozzle vane assemblyExplanation
The turbine nozzle vane assembly is placed in front of the rotating blades in an engine turbine section. This assembly consists of multiple nozzle vanes that direct the flow of hot gases onto the turbine blades, allowing for efficient energy transfer and power generation. The nozzle vanes help to control the flow of gases and ensure that they are directed onto the blades at the correct angle and velocity, maximizing the turbine's performance.Rate this question:
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- 31.
Why is the "fir tree" method of attaching turbine blades(buckets) to the turbine rotor disc preferred?
- A.
There is a significant temperature differential between the turbine rotor disc and the blades
- B.
This method aids in preventing horizontal movement of the blades
- C.
This method aids in preventing axial movement of the bucket
- D.
There is more blade tip shake during engine operation
Correct Answer
A. There is a significant temperature differential between the turbine rotor disc and the bladesExplanation
The "fir tree" method of attaching turbine blades to the turbine rotor disc is preferred because there is a significant temperature differential between the turbine rotor disc and the blades. This method allows for better thermal expansion and contraction of the blades, reducing the risk of damage or failure due to the temperature difference. By securely attaching the blades using the "fir tree" method, it ensures that they can withstand the stress caused by the temperature differential without any horizontal or axial movement, thus maintaining the efficiency and reliability of the turbine.Rate this question:
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- 32.
The exhaust duct connects the turbine outlet and the
- A.
Fan duct
- B.
Jet nozzle
- C.
Fuel nozzle
- D.
Bifurcated duct
Correct Answer
B. Jet nozzleExplanation
The exhaust duct connects the turbine outlet and the jet nozzle. The jet nozzle is responsible for accelerating and directing the exhaust gases out of the engine, providing the necessary thrust for the aircraft. Therefore, it makes sense for the exhaust duct to be connected to the jet nozzle in order to efficiently channel and control the flow of exhaust gases.Rate this question:
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- 33.
The purpose of the exhaust duct is to
- A.
Swirl exhaust gas-flow
- B.
Equalize exhaust gas-flow
- C.
Straighten exhaust gas-flow
- D.
Modulate exhaust gas-flow
Correct Answer
C. Straighten exhaust gas-flowExplanation
The purpose of the exhaust duct is to straighten the exhaust gas-flow. This means that the duct is designed in a way that allows the exhaust gas to flow in a straight and smooth manner, reducing turbulence and improving the efficiency of the exhaust system. By straightening the gas-flow, the exhaust duct helps to minimize resistance and pressure drop, allowing for better performance and optimal functioning of the exhaust system.Rate this question:
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- 34.
The purpose of an augmentor (afterburner) in a jet engine is to
- A.
Increase engine rpm
- B.
Reduce pressure drop
- C.
Augment basic ewngine thrust
- D.
Increase EGT
Correct Answer
C. Augment basic ewngine thrustExplanation
The purpose of an augmentor (afterburner) in a jet engine is to increase the basic engine thrust. By injecting additional fuel into the exhaust stream and igniting it, the afterburner generates extra thrust, significantly enhancing the engine's power output. This allows the aircraft to achieve higher speeds and perform maneuvers that require greater thrust, such as takeoff, supersonic flight, or combat situations. The augmentor is a crucial component in maximizing the performance capabilities of a jet engine.Rate this question:
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- 35.
How many different types of loads can be imposed on a jet engine bearing?
- A.
Two
- B.
Three
- C.
Four
- D.
Five
Correct Answer
B. ThreeExplanation
A jet engine bearing can experience three different types of loads: radial load, axial load, and moment load. Radial load refers to the force that acts perpendicular to the axis of the bearing, axial load refers to the force that acts parallel to the axis of the bearing, and moment load refers to the twisting force that acts on the bearing. Therefore, the correct answer is three.Rate this question:
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- 36.
When you handle jet engine bearings, you must change cotton gloves frequently because they
- A.
Wear faster
- B.
Attract dirt
- C.
Cause oxidation
- D.
Get soaked with sweat
Correct Answer
D. Get soaked with sweatExplanation
When handling jet engine bearings, it is necessary to change cotton gloves frequently because they get soaked with sweat. Sweat can make the gloves wet and damp, reducing their effectiveness in providing a good grip and protection. Additionally, wet gloves can also lead to discomfort and potential skin irritation. Therefore, changing the gloves frequently ensures that they remain dry and maintain their functionality during the handling process.Rate this question:
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- 37.
Before inspecting new jet engine bearings, you should
- A.
Seperate the halves
- B.
Apply a preservative
- C.
Perform a spin check
- D.
Remove the preservative coating
Correct Answer
D. Remove the preservative coatingExplanation
Before inspecting new jet engine bearings, it is necessary to remove the preservative coating. This is because the preservative coating is applied to protect the bearings during storage and transportation. However, it can interfere with the inspection process and potentially mask any defects or damage that may be present. Therefore, removing the preservative coating allows for a thorough and accurate inspection of the bearings to ensure their quality and functionality.Rate this question:
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- 38.
The bearing removal tools that are most commonly used include
- A.
Drift pipes and hammers
- B.
Bearing pullers and hammers
- C.
Drift pipes and arbor presses
- D.
Arbor presses and bearing pullers
Correct Answer
D. Arbor presses and bearing pullersExplanation
Arbor presses and bearing pullers are commonly used bearing removal tools. Arbor presses are used to apply pressure to remove bearings from a shaft or housing, while bearing pullers are used to grip and pull the bearing out. These tools are effective in safely and efficiently removing bearings without causing damage to the surrounding components. Drift pipes and hammers may be used in some cases, but they are not as commonly used as arbor presses and bearing pullers.Rate this question:
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- 39.
Which type of defect appears on bearings as a result of bearing parts striking together?
- A.
Nicks
- B.
Galling
- C.
Grooves
- D.
Scratches
Correct Answer
A. NicksExplanation
Nicks are a type of defect that appear on bearings as a result of bearing parts striking together. When the bearing parts collide or experience impact, small chips or dents can be formed on the surface, which are known as nicks. These nicks can lead to increased friction, reduced performance, and potential failure of the bearing over time.Rate this question:
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- 40.
Which type of defect appears on bearings as a result of small particles of foreign material becoming lodged between the rollers?
- A.
Pits
- B.
Bands
- C.
Grooves
- D.
Brinelling
Correct Answer
C. GroovesExplanation
Grooves appear on bearings as a result of small particles of foreign material becoming lodged between the rollers. These particles can cause wear and tear on the surface of the bearing, creating grooves or indentations. This can lead to reduced performance and increased friction in the bearing, potentially causing it to fail prematurely.Rate this question:
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- 41.
Excessive bearing wear can usually be detected by
- A.
Pits
- B.
Bands
- C.
Misalignment
- D.
Roughness of metal
Correct Answer
D. Roughness of metalExplanation
Excessive bearing wear can usually be detected by the roughness of metal. When a bearing wears excessively, the smooth surface of the metal becomes rough due to friction and wear. This roughness can be felt or observed by touching or visually inspecting the bearing. It indicates that the bearing is no longer functioning properly and may need to be replaced or repaired.Rate this question:
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- 42.
The recommended method of heating inner reaces of bearings before installing them is
- A.
Hot-oil bath
- B.
Portable heater
- C.
Bearing furnace
- D.
Hydraulic bath
Correct Answer
A. Hot-oil bathExplanation
Heating the inner races of bearings before installation is necessary to expand the metal and make it easier to fit onto the shaft. A hot-oil bath is a recommended method because it provides a uniform and controlled heating process. The bearings are immersed in hot oil, which evenly distributes heat and ensures that the entire inner race reaches the desired temperature. This method is effective and minimizes the risk of overheating or damaging the bearings. Portable heaters, bearing furnaces, and hydraulic baths may not provide the same level of control and uniformity as a hot-oil bath.Rate this question:
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- 43.
Which component reduces the engine rotor speed to the rpm required for accessories?
- A.
Step motors
- B.
Reduction motor
- C.
Reduction geartrain
- D.
Gear case drive assembly
Correct Answer
C. Reduction geartrainExplanation
The reduction geartrain is responsible for reducing the engine rotor speed to the rpm required for accessories. This component is designed to decrease the rotational speed and increase torque, allowing the engine to efficiently power various accessories such as alternators, power steering pumps, and air conditioning compressors. By using a series of gears with different sizes, the reduction geartrain is able to achieve the desired rpm for the accessories while maintaining the engine's optimal operating speed.Rate this question:
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- 44.
On an F108 engine, the radial drive shaft connects the core engine to the
- A.
Hydraulic actuator motor
- B.
Accessory drive assembly
- C.
Variable bleed valves
- D.
Fan booster rotor
Correct Answer
B. Accessory drive assemblyExplanation
The radial drive shaft on an F108 engine connects the core engine to the accessory drive assembly. This means that it is responsible for transmitting power from the engine to various accessories, such as generators, pumps, and other components that require mechanical power. The accessory drive assembly is an essential part of the engine's overall functionality and ensures that all necessary accessories are properly powered and operational.Rate this question:
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- 45.
The major sections of a turboprop engine are the power unit, torquemeter assembly, and
- A.
Turbine assembly
- B.
Compressor assembly
- C.
Combustion assembly
- D.
RGB assembly
Correct Answer
D. RGB assemblyExplanation
The major sections of a turboprop engine include the power unit, torquemeter assembly, and RGB assembly. The power unit is responsible for generating the power needed to drive the propeller. The torquemeter assembly measures the torque produced by the engine. The RGB assembly, which stands for Reduction Gearbox, is an important component that reduces the high-speed output of the turbine to a suitable speed for driving the propeller. It is responsible for transmitting power from the engine to the propeller efficiently. The compressor assembly and combustion assembly are also important sections of a turboprop engine, but they are not mentioned in the question.Rate this question:
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- 46.
On the T56 turboprop engine, what is the overall reduction ratio of the RGB's main reduction gear train?
- A.
.3125 to 1
- B.
4.333 to 1
- C.
13.54 to 1
- D.
13,820 to 1
Correct Answer
C. 13.54 to 1Explanation
The overall reduction ratio of the RGB's main reduction gear train on the T56 turboprop engine is 13.54 to 1.Rate this question:
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- 47.
On the T56 turboprop engine, how many stages of reduction are in the RGB's main reduction gear train?
- A.
1
- B.
2
- C.
3
- D.
4
Correct Answer
B. 2Explanation
The T56 turboprop engine has two stages of reduction in the RGB's main reduction gear train.Rate this question:
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- 48.
On the T56 turboprop engine, there are mounting pads on the aft side of the accessory drive for the fuel control, fuel pump, and
- A.
Speed-sensitive valve
- B.
Engine main oil pump
- C.
Speed-sensitive control
- D.
External scavenge oil pump
Correct Answer
D. External scavenge oil pumpExplanation
The T56 turboprop engine has mounting pads on the aft side of the accessory drive for various components including the fuel control, fuel pump, and speed-sensitive valve. However, the correct answer is the external scavenge oil pump. This means that among the given options, the external scavenge oil pump is one of the components that has mounting pads on the aft side of the accessory drive on the T56 turboprop engine.Rate this question:
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- 49.
On the T56 turboprop engine, which compressor section assmebly disperses compressor discharge air and directs it to the combustion chambers?
- A.
Diffuser
- B.
Compressor rotor
- C.
Compressor housing
- D.
Compressor air inlet housing
Correct Answer
D. Compressor air inlet housingExplanation
The compressor air inlet housing on the T56 turboprop engine is responsible for dispersing the compressor discharge air and directing it to the combustion chambers. It serves as a pathway for the compressed air to enter the engine and ensures that it is properly distributed to the combustion process.Rate this question:
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- 50.
In the T56 engine, which RGB component rotates at the same speed as the power unit rotors?
- A.
Sun gear
- B.
Ring gear
- C.
Main drive gear
- D.
Pinion input gear
Correct Answer
D. Pinion input gearExplanation
The pinion input gear rotates at the same speed as the power unit rotors in the T56 engine.Rate this question:
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