# Volume 2. Engine Theory And Construction

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• 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

C. Newton's second law of motion
Explanation
This statement describes Newton's second law of motion, which states that 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.

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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

C. Divergent
Explanation
A divergent duct would decrease the velocity and increase the pressure of a gas as it passes through. In a divergent duct, the cross-sectional area gradually increases along the flow direction. This causes the gas to expand, resulting in a decrease in velocity and an increase in pressure. The gradual expansion allows the gas to slow down and increase in pressure, making a divergent duct suitable for applications where pressure increase is desired, such as in diffusers or exhaust systems.

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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

A. Bernoulli's principle
Explanation
According to Bernoulli's principle, as the velocity of a fluid (in this case, air) increases, the pressure exerted by the fluid decreases. When air flows over an airfoil, the shape of the airfoil causes the air to move faster over the top surface, resulting in lower pressure above the airfoil compared to the pressure below it. This pressure difference creates lift, which is the upward force that allows an aircraft to stay airborne. Therefore, Bernoulli's principle best describes the combination of decreased pressure above an airfoil and increased pressure below it, resulting in lift.

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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

B. Inertia
Explanation
Inertia is the correct answer because it refers to the tendency of an object at rest to stay at rest and an object in motion to keep moving in a straight line at a constant speed. This property is a fundamental concept in physics and is related to the mass of an object. Inertia is responsible for the resistance an object exhibits to changes in its state of motion.

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• 5.

### Which section of a jet engine introduces and burns fuel?

• A.

Turbine

• B.

Diffuser

• C.

Compressor

• D.

Combustion

D. Combustion
Explanation
The section of a jet engine that introduces and burns fuel is the combustion section. In this section, fuel is mixed with compressed air and ignited, creating a high-temperature and high-pressure gas. This gas expands rapidly and moves through the turbine, driving it and producing thrust. The combustion section is crucial for the overall functioning of the jet engine as it generates the energy needed to propel the aircraft forward.

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• 6.

### 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

A. Accelerating a large mass of air by a small amount
Explanation
A turboprop engine produces thrust by accelerating a large mass of air by a small amount. This is achieved by using a gas turbine engine to drive a propeller. The engine takes in air, compresses it, and then mixes it with fuel and ignites it. The resulting hot gases expand and pass through a turbine, which drives the compressor and the propeller. As the propeller rotates, it accelerates a large mass of air behind it, creating thrust that propels the aircraft forward. This method is efficient for low-speed aircraft and provides good fuel economy.

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• 7.

### Which type of horsepower is delivered to the propeller for useful work?

• A.

Brake

• B.

Indicated

• C.

Frictional

• D.

Equivalent shaft

A. Brake
Explanation
The type of horsepower that is delivered to the propeller for useful work is brake horsepower. 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.

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• 8.

### The heat content per pound of kerosene is how many BTU's?

• A.

10,500

• B.

15,500

• C.

18,500

• D.

40,000

C. 18,500
Explanation
Kerosene has a heat content of approximately 18,500 BTUs per pound. This means that when one pound of kerosene is burned, it releases 18,500 BTUs of heat energy. This high heat content makes kerosene a suitable fuel for various applications, such as heating and power generation.

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• 9.

### To measure barometric pressure, you would use a

• A.

Potentiometer

• B.

Psychrometer

• C.

Pyrometer

• D.

Barometer

D. Barometer
Explanation
A barometer is used to measure barometric pressure, which is the pressure exerted by the atmosphere. It consists of a glass tube filled with mercury or aneroid cells that expand or contract based on the pressure changes. The height of the mercury column or the position of the aneroid cells indicates the atmospheric pressure. Potentiometer is used to measure electrical potential difference, psychrometer is used to measure humidity, and pyrometer is used to measure high temperatures. Therefore, the correct instrument for measuring barometric pressure is a barometer.

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• 10.

### 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

A. Increases pressure
Explanation
A divergent design of a diffuser increases air pressure. This is because a divergent diffuser gradually expands the flow area, allowing the air to slow down and increase in pressure. As the air flows through the divergent diffuser, it experiences a decrease in velocity and an increase in pressure due to the expansion of the flow area. Therefore, the divergent design of a diffuser has the effect of increasing air pressure.

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• 11.

### Which engine component meters fuel for combustion?

• A.

P&D valve

• B.

Fuel pump

• C.

Fuel control

• D.

Fuel nozzles

C. Fuel control
Explanation
The fuel control is responsible for metering the fuel for combustion in an engine. It regulates the flow of fuel to ensure the correct amount is delivered to the combustion chambers. This component plays a crucial role in maintaining the proper air-fuel ratio for efficient combustion and optimal engine performance. The P&D valve, fuel pump, and fuel nozzles are all important components in the fuel system, but they do not specifically meter the fuel for combustion like the fuel control does.

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• 12.

### What directs the gases onto the first-stage turbine wheel blades in a jet engine?

• A.

Flameholder

• B.

Combustion chamber

• C.

• D.

Turbine stator

D. Turbine stator
Explanation
The gases in a jet engine are directed onto the first-stage turbine wheel blades by the turbine stator. The turbine stator is a stationary set of blades that guide the flow of gases from the combustion chamber towards the turbine wheel blades. It helps to control the direction and velocity of the gases, ensuring that they hit the turbine wheel blades at the correct angle and with sufficient force to drive the turbine and generate power.

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• 13.

### 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)

D. Turbine stator(nozzle diaphragm)
Explanation
When two or more turbine wheels are used in a jet engine, the component that is placed directly in front of each turbine wheel is the turbine stator (nozzle diaphragm). The turbine stator is responsible for directing the flow of gases onto the turbine wheel, which helps to extract energy from the gases and convert it into mechanical energy to drive the engine. It acts as a stationary guide for the gases before they enter the turbine wheel, ensuring efficient operation of the turbine system.

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• 14.

### Three major sections of all jet engines are compressor, combustion, and

• A.

Turbo

• B.

Turbine

• C.

Exhaust

• D.

Diffuser

B. Turbine
Explanation
The correct answer is turbine. In a jet engine, the turbine is responsible for extracting energy from the hot combustion gases and converting it into mechanical energy to drive the compressor and other engine accessories. It consists of a series of blades that are driven by the high-velocity gases from the combustion chamber. This mechanical energy is then used to drive the compressor, which compresses incoming air, and the exhaust gases are expelled through the exhaust section. The diffuser is not a major section of a jet engine, but rather a component that slows down and increases the pressure of the air before it enters the combustion chamber.

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• 15.

### 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

A. Sliding-vane air compressors
Explanation
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 pumping action. This design allows for a continuous flow of fluid or air, making it efficient for high-pressure applications like jet engines. The vanes in both pumps also create a seal against the pump housing, preventing any leakage. Therefore, the similarity between vane-type fuel pumps and sliding-vane air compressors lies in their design and functionality.

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• 16.

### 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.

A. Rotational and centrifugal
Explanation
After air is drawn into the guide vanes of a centrifugal compressor, it is subjected to two forces: rotational force, which is the result of the spinning motion of the compressor impeller, and centrifugal force, which is the outward force that pushes the air away from the center of rotation. These two forces work together to compress the air and increase its pressure.

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• 17.

### 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

C. Is a forged single unit
Explanation
The correct answer is that the impeller is a forged single unit. This means that the impeller is manufactured as a single piece, rather than being assembled from multiple parts. This constructional feature provides several advantages, including increased strength and durability, improved efficiency, and reduced maintenance requirements. By being forged as a single unit, the impeller can withstand the high rotational speeds and pressures required for centrifugal compression without the risk of failure or damage that may occur with a multi-part design.

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• 18.

### 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

D. Provide a passage for the main fuel supply
Explanation
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 hollow shaft and reach the combustion chamber where it can be ignited to produce power. Without this passage, the fuel would not be able to reach the combustion chamber and the engine would not be able to function properly.

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• 19.

### 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

A. Direct air and increase pressure
Explanation
The stationary vanes positioned between rotor discs in a compressor are used to direct air and increase pressure. These vanes act as a guide for the airflow, ensuring that it flows in the desired direction and is compressed effectively. By directing the air, the vanes help to increase the pressure within the compressor, which is essential for efficient operation. This process allows the compressor to generate higher pressure levels, which is necessary for various applications such as power generation, air conditioning, and industrial processes.

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• 20.

### 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

C. Fuel control
Explanation
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 directly affects the speed at which the compressor operates. By adjusting the fuel flow, the fuel control can increase or decrease the rpm of the N2 compressor, allowing for precise control over the engine's performance.

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• 21.

### 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

D. Directing air around the plug
Explanation
Directing air around the plug helps prevent igniter plug fouling by keeping the plug cooler and reducing the build-up of carbon deposits. This allows for a more efficient combustion process and ensures that the plug remains clean and functional. Gold plating, split electrode, and ceramic coating on the plug may have other benefits in engine design but do not specifically address the prevention of igniter plug fouling.

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• 22.

### 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

A. Cool the burner surfaces
Explanation
The excess airflow that is not burned in the combustion section is used to cool the burner surfaces. This is because the combustion process generates a significant amount of heat, and if the burner surfaces are not cooled, they can become damaged or even melt. Therefore, the excess airflow is directed towards the burner surfaces to remove heat and maintain their integrity.

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• 23.

### 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

B. Drained overboard by a drain system
Explanation
After a failed start, the fuel that accumulates is drained overboard by a drain system. This is done to remove the excess fuel and prevent any potential hazards. Draining the fuel overboard ensures that it does not enter the fuel control system again, which could cause further issues. Instead of allowing the fuel to evaporate or burn on the next start attempt, it is safer and more efficient to drain it using a drain system.

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• 24.

### 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

D. Combustion chamber cross over tubes
Explanation
The correct answer is combustion chamber cross over tubes. The combustion chamber cross over tubes connect the different combustion chambers in a can-annular combustion section. They allow for the flow of combustion gases between the chambers, ensuring even distribution of heat and pressure. Therefore, they need to be removed in a specific order to maintain the integrity and functionality of the combustion section.

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• 25.

### What is the most common type of fuel nozzle system?

• A.

Pressure-atomizing

• B.

Fuel-blasting

• C.

Fuel ejector

• D.

Fuel tube

A. Pressure-atomizing
Explanation
Pressure-atomizing is the most common type of fuel nozzle system. This system uses pressure to atomize the fuel into small particles, allowing for efficient combustion. It is widely used in various applications such as gas turbines, boilers, and industrial burners. The fuel is injected into the combustion chamber under high pressure, where it mixes with air and ignites. This type of system offers better fuel efficiency, improved combustion control, and reduced emissions compared to other nozzle systems.

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• 26.

### Swirl-type fuel nozzles usually are used to provide what type of flame speed?

• A.

Low

• B.

High

• C.

Medium

• D.

Medium-high

B. High
Explanation
Swirl-type fuel nozzles are designed to provide a high flame speed. This is because the swirling motion of the fuel and air mixture created by these nozzles promotes better mixing and faster combustion. The increased turbulence and mixing result in a more efficient and intense flame, leading to a higher flame speed.

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• 27.

### 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

D. Reaction-impulse
Explanation
The given answer, "reaction-impulse," is the correct answer because it accurately identifies a type of turbine and vane assembly used in jet engines. The term "reaction-impulse" refers to a combination of both impulse and reaction turbines. Impulse turbines are driven by the impact of a high-velocity jet of fluid, while reaction turbines are driven by the pressure difference between the inlet and outlet of the turbine. A reaction-impulse turbine combines the principles of both types of turbines to maximize efficiency and power output in jet engines.

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• 28.

### 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

D. Turbine nozzle vane assembly
Explanation
The turbine nozzle vane assembly is placed in front of the rotating blades in an engine turbine section. This assembly consists of a series of vanes that direct the flow of hot gases onto the turbine blades, allowing for the efficient conversion of energy. The vanes in the assembly are designed to control the direction and velocity of the gases, ensuring optimal performance of the turbine.

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• 29.

### 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

A. There is a significant temperature differential between the turbine rotor disc and the blades
Explanation
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 the differential expansion and contraction of the blades and disc due to the temperature difference, ensuring a secure and stable attachment.

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• 30.

### The exhaust duct connects the turbine outlet and the

• A.

Fan duct

• B.

Jet nozzle

• C.

Fuel nozzle

• D.

Bifurcated duct

B. Jet nozzle
Explanation
The exhaust duct connects the turbine outlet and the jet nozzle. The turbine outlet is where the exhaust gases from the turbine are expelled, and the jet nozzle is the final section of the engine where the exhaust gases are accelerated to create thrust. The exhaust duct serves as a pathway to direct the exhaust gases from the turbine outlet to the jet nozzle, allowing for efficient propulsion of the aircraft.

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• 31.

### 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

C. Straighten exhaust gas-flow
Explanation
The purpose of the exhaust duct is to straighten the exhaust gas-flow. This means that the duct is designed to remove any turbulence or irregularities in the flow of exhaust gases, ensuring that they move in a smooth and straight path. Straightening the exhaust gas-flow is important for efficient and effective exhaust system performance, as it helps to minimize back pressure and improve the overall flow dynamics. By straightening the exhaust gas-flow, the duct can help to optimize engine performance and reduce emissions.

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• 32.

### 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

C. Augment basic ewngine thrust
Explanation
The purpose of an augmentor (afterburner) in a jet engine is to increase the basic engine thrust. The augmentor is a device that injects additional fuel into the exhaust stream, which ignites and increases the temperature and velocity of the exhaust gases. This increased energy in the exhaust gases leads to a higher thrust output, providing a significant boost in performance and acceleration for the jet engine.

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• 33.

### How many different types of loads can be imposed on a jet engine bearing?

• A.

Two

• B.

Three

• C.

Four

• D.

Five

B. Three
Explanation
A jet engine bearing can be subjected to three different types of loads: radial loads, axial loads, and moment loads. Radial loads act perpendicular to the shaft, axial loads act parallel to the shaft, and moment loads act to twist the shaft. Therefore, there are three different types of loads that can be imposed on a jet engine bearing.

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• 34.

### 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

D. Get soaked with sweat
Explanation
When handling jet engine bearings, it is important to change cotton gloves frequently because they can get soaked with sweat. Sweat can make the gloves damp, which can affect their effectiveness in providing a good grip and protection. Additionally, damp gloves can cause discomfort and may lead to skin irritation. Therefore, changing the gloves regularly helps to maintain a dry and comfortable working environment.

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• 35.

### 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

D. Remove the preservative coating
Explanation
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 on the bearings. Therefore, removing the preservative coating ensures a thorough and accurate inspection can be conducted.

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• 36.

### 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

D. Arbor presses and bearing pullers
Explanation
Arbor presses and bearing pullers are the most commonly used tools for bearing removal. Arbor presses are used to apply pressure and force to remove bearings from shafts or housings, while bearing pullers are specifically designed to grip and extract bearings from their seating. These tools are preferred because they provide a controlled and efficient method for removing bearings without causing damage to the surrounding components. Drift pipes and hammers are not as commonly used for bearing removal, as they are more likely to cause accidental damage or misalignment during the removal process.

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• 37.

### Which type of defect appears on bearings as a result of bearing parts striking together?

• A.

Nicks

• B.

Galling

• C.

Grooves

• D.

Scratches

A. Nicks
Explanation
Nicks are a type of defect that appear on bearings as a result of bearing parts striking together. When two parts of a bearing make contact with each other, it can cause small chips or nicks to form on the surface. These nicks can lead to increased friction, wear, and potential failure of the bearing over time. Therefore, nicks are a common type of defect that can occur on bearings.

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• 38.

### 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

C. Grooves
Explanation
Grooves appear on bearings as a result of small particles of foreign material becoming lodged between the rollers. These grooves can cause uneven wear and damage to the bearing, leading to reduced performance and potential failure.

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• 39.

### Excessive bearing wear can usually be detected by

• A.

Pits

• B.

Bands

• C.

Misalignment

• D.

Roughness of metal

D. Roughness of metal
Explanation
Excessive bearing wear can usually be detected by the roughness of metal. When the bearing is worn out, the smooth surface of the metal becomes rough due to friction and abrasion. This roughness can be felt by touching the bearing or observed visually. It indicates that the bearing is no longer functioning properly and needs to be replaced. Pits, bands, and misalignment can also be signs of bearing wear, but the roughness of metal is a more reliable indicator in most cases.

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• 40.

### 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

A. Hot-oil bath
Explanation
The recommended method of heating inner races of bearings before installing them is a hot-oil bath. This method involves immersing the bearings in a bath of heated oil, which allows for even and controlled heating. The hot oil ensures that the bearings reach the desired temperature without causing any damage or uneven heating. This method is commonly used in industries where precision and accuracy are crucial, as it helps to expand the bearings and ease their installation onto shafts or housings.

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• 41.

### 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

C. Reduction geartrain
Explanation
The reduction geartrain is responsible for reducing the engine rotor speed to the rpm required for accessories. This component helps to match the speed of the engine with the speed requirements of the accessories, ensuring they operate efficiently and effectively. By reducing the speed through a series of gears, the reduction geartrain allows the engine to power the accessories at the appropriate speed without putting excessive strain on the engine or the accessories.

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• 42.

### 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

B. Accessory drive assembly
Explanation
The radial drive shaft on an F108 engine connects the core engine to the accessory drive assembly. This assembly is responsible for driving various accessories such as generators, pumps, and compressors, which are essential for the operation of the engine. It transfers power from the engine's core to these accessories, allowing them to function properly.

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• 43.

### 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

D. RGB assembly
Explanation
The correct answer is the compressor assembly. In a turboprop engine, the compressor assembly is responsible for compressing the incoming air before it enters the combustion chamber. This compressed air is then mixed with fuel and ignited to create the necessary combustion for generating power. The compressor assembly plays a crucial role in the overall functioning of the engine by ensuring proper air intake and compression, thereby increasing the efficiency and performance of the engine. The power unit and torquemeter assembly are also important components of a turboprop engine, but they are not the major sections as mentioned in the question.

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• 44.

### 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

C. 13.54 to 1
Explanation
The overall reduction ratio of the RGB's main reduction gear train on the T56 turboprop engine is 13.54 to 1.

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• 45.

### 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

B. 2
Explanation
The T56 turboprop engine has two stages of reduction in the RGB's main reduction gear train.

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• 46.

### 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

D. External scavenge oil pump
Explanation
The T56 turboprop engine has mounting pads on the aft side of the accessory drive for various components such as the fuel control, fuel pump, and speed-sensitive valve. In addition to these components, there is also an external scavenge oil pump mounted on the accessory drive. This pump is responsible for scavenging oil from various parts of the engine and returning it to the oil tank. It helps to maintain proper lubrication and cooling of the engine components, ensuring smooth and efficient operation.

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• 47.

### 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

D. Compressor air inlet housing
Explanation
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 acts as a pathway for the compressed air to enter the engine's combustion system, where it mixes with fuel and ignites to produce power. The compressor air inlet housing is designed to efficiently distribute the compressed air to the combustion chambers, ensuring proper combustion and engine performance.

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• 48.

### 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

D. Pinion input gear
Explanation
The pinion input gear in the T56 engine rotates at the same speed as the power unit rotors. This means that the pinion input gear is directly connected to the power unit rotors and transfers the rotational motion from the power unit to the gear system. As a result, the pinion input gear plays a crucial role in maintaining the speed and efficiency of the engine's operation.

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• 49.

### What is the total gear reduction ration of the RGB?

• A.

3.125:1

• B.

4.333:1

• C.

12.85:1

• D.

13.54:1

D. 13.54:1
Explanation
The total gear reduction ratio of the RGB is 13.54:1. This means that for every 13.54 revolutions of the input gear, the output gear will make one revolution. This indicates that the output gear rotates at a slower speed than the input gear, resulting in a higher torque output.

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• 50.

### What is not a propeller brake position?

• A.

Locked

• B.

Applied

• C.

Engaged

• D.

Released

C. Engaged
Explanation
Engaged is not a propeller brake position because when the propeller brake is engaged, it means that the brake is activated or applied, which would prevent the propeller from rotating. Therefore, "Engaged" cannot be a propeller brake position as it contradicts the purpose of the brake.

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• Current Version
• Mar 20, 2023
Quiz Edited by
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• Sep 03, 2009
Quiz Created by
Zack19

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