Turbine Engines pt. 1 ⭐️

60問 • 1年前

問題一覧

Turbine engine components exposed to high temperatures generally may NOT be marked with 1. layout dye. 2. commercial felt tip marker. 3. wax or grease pencil. 4. chalk. 5. graphite lead pencil.

3 and 5

Jet engine turbine blades removed for detailed inspection must be reinstalled in

the same slot.

The blending of blades and vanes in a turbine engine

should be performed parallel to the length of the blade using smooth contours to minimize stress points.

One function of the nozzle diaphragm in a turbine engine is to

Direct the flow of gases to strike the turbine blades at the desired angle.

Some high-volume turboprop and turbojet engines are equipped with two-spool or split compressors. When these engines are operated at high altitudes, the

low-pressure rotor will increase in speed as the compressor load decreases in the lower density air.

A gas turbine engine comprises which three main sections?

Turbine, compressor, and combustion.

An exhaust cone placed aft of the turbine in a jet engine will cause the pressure in the first part of the exhaust duct to

increase and the velocity to decrease.

The compression ratio of an axial-flow compressor is a function of the

number of compressor stages.

If a turbine engine is unable to reach takeoff EPR before its EGT limit is reached, this is an indication that the

compressor may be contaminated or damaged.

Which turbine engine compressor offers the greatest advantages for both starting flexibility and improved high-altitude performance?

Split-spool, axial-flow.

Who establishes the recommended operating time between overhauls (TBO) of a turbine engine used in general aviation?

The engine manufacturer.

Which statements are true regarding aircraft engine propulsion? 1. An engine driven propeller imparts a relatively small amount of acceleration to a large mass of air. 2. Turbojet and turbofan engines impart a relatively large amount of acceleration to a smaller mass of air. 3. In modern turboprop engines, nearly 50 percent of the exhaust gas energy is extracted by turbines to drive the propeller and compressor with the rest providing exhaust thrust.

1 and 2

Continued and/or excessive heat and centrifugal force on turbine engine rotor blades is likely to cause

Creep

The procedure for removing the accumulation of dirt deposits on compressor blades is called

field cleaning

The stators in the turbine section of a gas turbine engine

increase the velocity of the gas flow.

What is the first engine instrument indication of a successful start of a turbine engine?

A rise in the exhaust gas temperature.

In what section of a turbojet engine is the jet nozzle located?

Exhaust

The recurrent ingestion of dust or other fine airborne particulates into a turbine engine can result in

erosion damage to the compressor and turbine sections

What turbine engine section provides for proper mixing of the fuel and air?

Combustion section

Which two elements make up the axial-flow compressor assembly?

Rotor and stator

Three types of turbine blades are

impulse, reaction, and impulse-reaction.

The purpose of a bleed valve, located in the beginning stages of the compressor, in an aircraft gas turbine engine is to

vent some of the air overboard to prevent a compressor stall.

An advantage of the axial-flow compressor is its

high peak efficiency

Who establishes mandatory replacement times for critical components of turbine engines?

The engine manufacturer

What type igniter plug is used in the low tension ignition system of an aircraft turbofan engine?

Self-ionizing or shunted-gap type plug.

The velocity of subsonic air as it flows through a convergent nozzle

increases

When starting a turbine engine,

a hot start is indicated if the exhaust gas temperature exceeds specified limits.

Hot section inspections for many modern turbine engines are required

on a time or cycle basis.

What are the two functional elements in a centrifugal compressor?

Impeller and diffuser

Hot spots in the combustion section of a turbojet engine are possible indicators of

malfunctioning fuel nozzles

How does a dual axial-flow compressor improve the efficiency of a turbojet engine?

Higher compression ratios can be obtained.

(1) In a turbine engine axial-flow compressor, each consecutive pair of rotor and stator blades constitutes a pressure stage. (2) In a turbine engine axial-flow compressor, the number of rows of stages is determined by the amount of air and total pressure rise required. Regarding the thove statements,

both No. 1 and No. 2 are true.

The basic gas turbine engine is divided into two main sections: the cold section and the hot section. (1) The cold section includes the engine inlet, compressor, and turbine sections. (2) The hot section includes the combustor, diffuser, and exhaust sections. Regarding the above statements,

neither No. 1 nor No. 2 is true.

If the RPM of an axial-flow compressor remains constant, the angle of attack of the rotor blades can be changed by

changing the velocity of the airflow.

Which of the following factors affect the thermal efficiency of a turbine engine? 1. Turbine inlet temperature. 2. Compression ratio. 3. Ambient temperature. 4. Speed of the aircraft. 5. Turbine and compressor efficiency. 6. Altitude of the aircraft.

1, 2, 5

The velocity of supersonic air as it flows through a divergent nozzle

increases

Where do stress rupture cracks usually appear on turbine blades?

Across the leading or trailing edge at a right angle to the edge length.

In a gas turbine engine, combustion occurs at a constant

pressure

What is meant by a double entry centrifugal compressor?

A compressor with vanes on both sides of the impeller.

The pressure of supersonic air as it flows through a divergent nozzle

decreases

What is the proper starting sequence for a turbojet engine?

Starter, ignition, fuel.

Which of the following types of combustion sections are used in aircraft turbine engines?

Multiple-can, annular, and can-annular.

Generally, when starting a turbine engine, the starter should be disengaged

after the engine has reached self-accelerating speed.

In which type of turbine engine combustion chamber is the case and liner removed and installed as one unit during routine maintenance?

Can

What is the function of the stator vane assembly at the discharge end of a typical axial-flow compressor?

To straighten airflow to eliminate turbulence.

Some engine manufacturers of twin spool gas turbine engines identify turbine discharge pressure in their maintenance manuals as

Pt 7

Compressor field cleaning on turbine engines is performed primarily in order to

prevent engine performance degradation, increased fuel costs, and damage or corrosion to gas path surfaces.

Using standard atmospheric conditions, the standard sea level temperature is

59°F

Main bearing oil seals used with turbine engines are usually what type(s)?

Labyrinth and/or carbon rubbing

Hot spots on the tail cone of a turbine engine are possible indicators of a malfunctioning fuel nozzle or

a faulty combustion chamber

What should be done initially if a turbine engine catches fire when starting?

Turn off the fuel and continue engine rotation with the starter.

What is the possible cause when a turbine engine indicates no change in power setting parameters, but oil temperature is high?

Engine main bearing distress.

The stator vanes in an axial-flow compressor

convert velocity energy into pressure energy.

Turbine nozzle diaphragms located on the upstream side of each turbine wheel are used in the gas turbine engine to

increase the velocity of the heated gases flowing past this point.

A cool-off period prior to shutdown of a turbine engine is accomplished in order to

allow the turbine wheel to cool before the case contracts around it.

What is meant by a shrouded turbine?

The turbine blades are shaped so that their ends form a band or shroud.

What is used in turbine engines to aid in stabilization of compressor airflow during low thrust engine operation?

Variable guide vanes and/or compressor bleed valves.

In a turbine engine with a dual-spool compressor, the low speed compressor

seeks its own best operating speed.

Where is the highest gas pressure in a turbojet engine?

In the entrance of the burner section.

A purpose of the shrouds on the turbine blades of an axial-flow engine is to

reduce vibration

Airlaw (PCAR, AFCAR, Airframe check & Publications) (2)

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Induction and Airflow System

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Induction and Airflow System

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Engine Instrument System

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Fuel Metering System

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Ignition starting system pt. 1 ⭐️

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Ignition starting system pt. 2 ⭐️

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Turbine Engines pt. 2 ⭐️

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59問 • 1年前

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Powerplant (Propellers) pt. 1 ⭐️

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Powerplant (Propellers) pt. 1 ⭐️

60問 • 1年前

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Powerplant (Propellers) pt. 2 ⭐️

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Powerplant (Propellers) pt. 2 ⭐️

57問 • 1年前

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Powerplant (Auxiliary power unit)

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Powerplant (Auxiliary power unit)

10問 • 1年前

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Engine Lubrication ⭐️

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Engine Lubrication ⭐️

93問 • 1年前

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Assembly and Rigging ⭐️

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78問 • 1年前

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問題一覧

Turbine engine components exposed to high temperatures generally may NOT be marked with 1. layout dye. 2. commercial felt tip marker. 3. wax or grease pencil. 4. chalk. 5. graphite lead pencil.

3 and 5

Jet engine turbine blades removed for detailed inspection must be reinstalled in

the same slot.

The blending of blades and vanes in a turbine engine

should be performed parallel to the length of the blade using smooth contours to minimize stress points.

One function of the nozzle diaphragm in a turbine engine is to

Direct the flow of gases to strike the turbine blades at the desired angle.

Some high-volume turboprop and turbojet engines are equipped with two-spool or split compressors. When these engines are operated at high altitudes, the

low-pressure rotor will increase in speed as the compressor load decreases in the lower density air.

A gas turbine engine comprises which three main sections?

Turbine, compressor, and combustion.

An exhaust cone placed aft of the turbine in a jet engine will cause the pressure in the first part of the exhaust duct to

increase and the velocity to decrease.

The compression ratio of an axial-flow compressor is a function of the

number of compressor stages.

If a turbine engine is unable to reach takeoff EPR before its EGT limit is reached, this is an indication that the

compressor may be contaminated or damaged.

Which turbine engine compressor offers the greatest advantages for both starting flexibility and improved high-altitude performance?

Split-spool, axial-flow.

Who establishes the recommended operating time between overhauls (TBO) of a turbine engine used in general aviation?

The engine manufacturer.

1 and 2

Continued and/or excessive heat and centrifugal force on turbine engine rotor blades is likely to cause

Creep

The procedure for removing the accumulation of dirt deposits on compressor blades is called

field cleaning

The stators in the turbine section of a gas turbine engine

increase the velocity of the gas flow.

What is the first engine instrument indication of a successful start of a turbine engine?

A rise in the exhaust gas temperature.

In what section of a turbojet engine is the jet nozzle located?

Exhaust

The recurrent ingestion of dust or other fine airborne particulates into a turbine engine can result in

erosion damage to the compressor and turbine sections

What turbine engine section provides for proper mixing of the fuel and air?

Combustion section

Which two elements make up the axial-flow compressor assembly?

Rotor and stator

Three types of turbine blades are

impulse, reaction, and impulse-reaction.

The purpose of a bleed valve, located in the beginning stages of the compressor, in an aircraft gas turbine engine is to

vent some of the air overboard to prevent a compressor stall.

An advantage of the axial-flow compressor is its

high peak efficiency

Who establishes mandatory replacement times for critical components of turbine engines?

The engine manufacturer

What type igniter plug is used in the low tension ignition system of an aircraft turbofan engine?

Self-ionizing or shunted-gap type plug.

The velocity of subsonic air as it flows through a convergent nozzle

increases

When starting a turbine engine,

a hot start is indicated if the exhaust gas temperature exceeds specified limits.

Hot section inspections for many modern turbine engines are required

on a time or cycle basis.

What are the two functional elements in a centrifugal compressor?

Impeller and diffuser

Hot spots in the combustion section of a turbojet engine are possible indicators of

malfunctioning fuel nozzles

How does a dual axial-flow compressor improve the efficiency of a turbojet engine?

Higher compression ratios can be obtained.

both No. 1 and No. 2 are true.

neither No. 1 nor No. 2 is true.

If the RPM of an axial-flow compressor remains constant, the angle of attack of the rotor blades can be changed by

changing the velocity of the airflow.

1, 2, 5

The velocity of supersonic air as it flows through a divergent nozzle

increases

Where do stress rupture cracks usually appear on turbine blades?

Across the leading or trailing edge at a right angle to the edge length.

In a gas turbine engine, combustion occurs at a constant

pressure

What is meant by a double entry centrifugal compressor?

A compressor with vanes on both sides of the impeller.

The pressure of supersonic air as it flows through a divergent nozzle

decreases

What is the proper starting sequence for a turbojet engine?

Starter, ignition, fuel.

Which of the following types of combustion sections are used in aircraft turbine engines?

Multiple-can, annular, and can-annular.

Generally, when starting a turbine engine, the starter should be disengaged

after the engine has reached self-accelerating speed.

In which type of turbine engine combustion chamber is the case and liner removed and installed as one unit during routine maintenance?

Can

What is the function of the stator vane assembly at the discharge end of a typical axial-flow compressor?

To straighten airflow to eliminate turbulence.

Some engine manufacturers of twin spool gas turbine engines identify turbine discharge pressure in their maintenance manuals as

Pt 7

Compressor field cleaning on turbine engines is performed primarily in order to

prevent engine performance degradation, increased fuel costs, and damage or corrosion to gas path surfaces.

Using standard atmospheric conditions, the standard sea level temperature is

59°F

Main bearing oil seals used with turbine engines are usually what type(s)?

Labyrinth and/or carbon rubbing

Hot spots on the tail cone of a turbine engine are possible indicators of a malfunctioning fuel nozzle or

a faulty combustion chamber

What should be done initially if a turbine engine catches fire when starting?

Turn off the fuel and continue engine rotation with the starter.

What is the possible cause when a turbine engine indicates no change in power setting parameters, but oil temperature is high?

Engine main bearing distress.

The stator vanes in an axial-flow compressor

convert velocity energy into pressure energy.

Turbine nozzle diaphragms located on the upstream side of each turbine wheel are used in the gas turbine engine to

increase the velocity of the heated gases flowing past this point.

A cool-off period prior to shutdown of a turbine engine is accomplished in order to

allow the turbine wheel to cool before the case contracts around it.

What is meant by a shrouded turbine?

The turbine blades are shaped so that their ends form a band or shroud.

What is used in turbine engines to aid in stabilization of compressor airflow during low thrust engine operation?

Variable guide vanes and/or compressor bleed valves.

In a turbine engine with a dual-spool compressor, the low speed compressor

seeks its own best operating speed.

Where is the highest gas pressure in a turbojet engine?

In the entrance of the burner section.

A purpose of the shrouds on the turbine blades of an axial-flow engine is to

reduce vibration