Turbine Engines pt. 2 ⭐️

59問 • 1年前

問題一覧

Which of the following can cause fan blade shingling in a turbofan engine? 1. Engine over speed. 2. Engine over temperature. 3. Large, rapid throttle movements. 4. FOD.

1 and 4

What term is used to describe a permanent and cumulative deformation of the turbine blades of a turbojet engine?

Creep

What is the primary advantage of an axial-flow compressor over a centrifugal compressor?

Greater pressure ratio

In a dual axial-flow compressor, the first stage turbine drives

N(2) compressor

Between each row of rotating blades in a turbine engine compressor, there is a row of stationary blades which act to diffuse the air. These stationary blades are called

Stators

The non-rotating axial-flow compressor airfoils in an aircraft gas turbine engine, are called

stator vanes

Standard sea level pressure is

29.92” Hg

Severe rubbing of turbine engine compressor blades will usually cause

Galling

What is the function of the inlet guide vane assembly on an axial-flow compressor?

Directs the air into the first stage rotor blades at the proper angle.

Reduced blade vibration and improved airflow characteristics in gas turbines are brought about by

shrouded turbine rotor blades

Anti-icing of jet engine air inlets is commonly accomplished by

engine bleed air ducted through the critical areas.

Dirt particles in the air being introduced into the compressor of a turbine engine will form a coating on all but which of the following?

Turbine blades

A weak fuel to air mixture along with normal airflow through a turbine engine may result in

a lean die-out

Newton’s Law of Motion, generally termed the “Law of Momentum,” states:

Acceleration is produced when a force acts on a mass. The greater the mass, the greater the amount of force needed.

In an axial-flow compressor, one purpose of the stator vanes at the discharge end of the compressor is to

straighten the airflow and eliminate turbulence.

What is the primary factor which controls the pressure ratio of an axial-flow compressor?

Number of stages in compressor

The function of the exhaust cone assembly of a turbine engine is to

straighten and collect the exhaust gases into a solid exhaust jet.

What is the profile of a turbine engine compressor blade?

A reduced blade tip thickness

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

1, 4, 5

A turbine engine hot section is particularly susceptible to which kind of damage?

Cracking

What type of turbine blade is most commonly used in aircraft jet engines?

Impulse-reaction

The two types of centrifugal compressor impellers are

single entry and double entry

Newton’s First Law of Motion, generally termed the Law of Inertia, states:

Everybody persists in its state of rest, or of motion in a straight line, unless acted upon by some outside force.

The turbine section of a jet engine

drives the compressor section.

The fan rotational speed of a dual axial compressor forward fan engine is the same as the

low-pressure compressor

The Brayton cycle is known as the constant

pressure cycle

What is the purpose of the dump valve used on aircraft gas turbine engines?

The fuel is quickly cut off to the nozzles and the manifolds are drained preventing fuel boiling off as a result of residual engine heat.

When starting a turbine engine, a hung start is indicated if the engine

fails to reach idle RPM.

The abbreviation Pt7 used in turbine engine terminology means

the total pressure at station No. 7

When the leading edge of a first-stage turbine blade is found to have stress rupture cracks, which of the following should be suspected?

Over temperature condition

What are the two basic elements of the turbine section in a turbine engine?

Stator and rotor

The highest heat-to-metal contact in a jet engine is the

turbine inlet guide vanes

When aircraft turbine blades are subjected to excessive heat stress, what type of failures would you expect?

Stress rupture

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

decreases

What is the purpose of the diffuser section in a turbine engine?

To increase pressure and reduce velocity.

Which of the following is the ultimate limiting factor of turbine engine operation?

Turbine inlet temperature

In the dual axial-flow or twin spoil compressor system, the first stage turbine drives the

N(2) compressor

Which of the following engine variables is the most critical during turbine engine operation?

Turbine inlet temperature

(1) Welding and straightening of turbine engine rotating airfoils does not require special equipment. (2) Welding and straightening of turbine engine rotating airfoils is commonly recommended by the manufacturer. Regarding the above statements,

neither No. 1 nor No. 2 is true.

What is the major function of the turbine assembly in a turbojet engine?

Supplies the power to turn the compressor.

Turbine blades are generally more susceptible to operating damage than compressor blades because of

exposure to high temperatures.

If, during inspection at engine overhaul, ball or roller bearings are found to have magnetism but otherwise have no defects, they

must be degaussed before use.

Stator blades in the compressor section of an axial-flow turbine engine

decrease the air velocity and prevent swirling.

What must be done after the fuel control unit has been replaced on an aircraft gas turbine engine?

Retrim the engine.

The air passing through the combustion chamber of a turbine engine is

used to support combustion and to cool the engine.

During inspection, turbine engine components exposed to high temperatures may only be marked with such materials as allowed by the manufacturer. These materials generally include 1. layout dye. 2. commercial felt tip marker. 3. wax or grease pencil. 4. chalk. 5. graphite lead pencil.

1, 2, and 4

What is one purpose of the stator blades in the compressor section of a turbine engine?

Control the direction of the airflow.

Why do some turbine engines have more than one turbine wheel attached to a single shaft?

To extract more power from the exhaust gases than a single wheel can absorb.

Which of the following influences the operation of an automatic fuel control unit on a turbojet engine?

Burner pressure

(1) Accumulation of contaminates in the compressor of a turbojet engine reduces aerodynamic efficiency of the blades. (2) Two common methods for removing dirt deposits from turbojet engine compressor blades are a fluid wash and an abrasive grit blast. Regarding the above statements,

both No. 1 and No. 2 are true.

The diffuser section of a jet engine is located between

the compressor section and the burner section

The compressor stators in a gas turbine engine act as diffusers to

decrease the velocity of the gas flow

Which statement is true regarding jet engines?

At the higher engine speeds, thrust increases rapidly with small increases in RPM.

The exhaust section of a turbine engine is designed to

impart a high exit velocity to the exhaust gases.

A turbine engine compressor which contains vanes on both sides of the impeller is a

double entry centrifugal compressor

A condition known as ‘hot streaking’ in turbine engines is caused by

a partially clogged fuel nozzle

An advantage of the centrifugal-flow compressor is its high

pressure rise per stage

At what stage in a turbine engine are gas pressures the greatest?

Compressor outlet

At what point in an axial-flow turbojet engine will the highest gas pressures occur?

At the compressor outlet

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問題一覧

Which of the following can cause fan blade shingling in a turbofan engine? 1. Engine over speed. 2. Engine over temperature. 3. Large, rapid throttle movements. 4. FOD.

1 and 4

What term is used to describe a permanent and cumulative deformation of the turbine blades of a turbojet engine?

Creep

What is the primary advantage of an axial-flow compressor over a centrifugal compressor?

Greater pressure ratio

In a dual axial-flow compressor, the first stage turbine drives

N(2) compressor

Between each row of rotating blades in a turbine engine compressor, there is a row of stationary blades which act to diffuse the air. These stationary blades are called

Stators

The non-rotating axial-flow compressor airfoils in an aircraft gas turbine engine, are called

stator vanes

Standard sea level pressure is

29.92” Hg

Severe rubbing of turbine engine compressor blades will usually cause

Galling

What is the function of the inlet guide vane assembly on an axial-flow compressor?

Directs the air into the first stage rotor blades at the proper angle.

Reduced blade vibration and improved airflow characteristics in gas turbines are brought about by

shrouded turbine rotor blades

Anti-icing of jet engine air inlets is commonly accomplished by

engine bleed air ducted through the critical areas.

Dirt particles in the air being introduced into the compressor of a turbine engine will form a coating on all but which of the following?

Turbine blades

A weak fuel to air mixture along with normal airflow through a turbine engine may result in

a lean die-out

Newton’s Law of Motion, generally termed the “Law of Momentum,” states:

Acceleration is produced when a force acts on a mass. The greater the mass, the greater the amount of force needed.

In an axial-flow compressor, one purpose of the stator vanes at the discharge end of the compressor is to

straighten the airflow and eliminate turbulence.

What is the primary factor which controls the pressure ratio of an axial-flow compressor?

Number of stages in compressor

The function of the exhaust cone assembly of a turbine engine is to

straighten and collect the exhaust gases into a solid exhaust jet.

What is the profile of a turbine engine compressor blade?

A reduced blade tip thickness

1, 4, 5

A turbine engine hot section is particularly susceptible to which kind of damage?

Cracking

What type of turbine blade is most commonly used in aircraft jet engines?

Impulse-reaction

The two types of centrifugal compressor impellers are

single entry and double entry

Newton’s First Law of Motion, generally termed the Law of Inertia, states:

Everybody persists in its state of rest, or of motion in a straight line, unless acted upon by some outside force.

The turbine section of a jet engine

drives the compressor section.

The fan rotational speed of a dual axial compressor forward fan engine is the same as the

low-pressure compressor

The Brayton cycle is known as the constant

pressure cycle

What is the purpose of the dump valve used on aircraft gas turbine engines?

The fuel is quickly cut off to the nozzles and the manifolds are drained preventing fuel boiling off as a result of residual engine heat.

When starting a turbine engine, a hung start is indicated if the engine

fails to reach idle RPM.

The abbreviation Pt7 used in turbine engine terminology means

the total pressure at station No. 7

When the leading edge of a first-stage turbine blade is found to have stress rupture cracks, which of the following should be suspected?

Over temperature condition

What are the two basic elements of the turbine section in a turbine engine?

Stator and rotor

The highest heat-to-metal contact in a jet engine is the

turbine inlet guide vanes

When aircraft turbine blades are subjected to excessive heat stress, what type of failures would you expect?

Stress rupture

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

decreases

What is the purpose of the diffuser section in a turbine engine?

To increase pressure and reduce velocity.

Which of the following is the ultimate limiting factor of turbine engine operation?

Turbine inlet temperature

In the dual axial-flow or twin spoil compressor system, the first stage turbine drives the

N(2) compressor

Which of the following engine variables is the most critical during turbine engine operation?

Turbine inlet temperature

neither No. 1 nor No. 2 is true.

What is the major function of the turbine assembly in a turbojet engine?

Supplies the power to turn the compressor.

Turbine blades are generally more susceptible to operating damage than compressor blades because of

exposure to high temperatures.

If, during inspection at engine overhaul, ball or roller bearings are found to have magnetism but otherwise have no defects, they

must be degaussed before use.

Stator blades in the compressor section of an axial-flow turbine engine

decrease the air velocity and prevent swirling.

What must be done after the fuel control unit has been replaced on an aircraft gas turbine engine?

Retrim the engine.

The air passing through the combustion chamber of a turbine engine is

used to support combustion and to cool the engine.

1, 2, and 4

What is one purpose of the stator blades in the compressor section of a turbine engine?

Control the direction of the airflow.

Why do some turbine engines have more than one turbine wheel attached to a single shaft?

To extract more power from the exhaust gases than a single wheel can absorb.

Which of the following influences the operation of an automatic fuel control unit on a turbojet engine?

Burner pressure

both No. 1 and No. 2 are true.

The diffuser section of a jet engine is located between

the compressor section and the burner section

The compressor stators in a gas turbine engine act as diffusers to

decrease the velocity of the gas flow

Which statement is true regarding jet engines?

At the higher engine speeds, thrust increases rapidly with small increases in RPM.

The exhaust section of a turbine engine is designed to

impart a high exit velocity to the exhaust gases.

A turbine engine compressor which contains vanes on both sides of the impeller is a

double entry centrifugal compressor

A condition known as ‘hot streaking’ in turbine engines is caused by

a partially clogged fuel nozzle

An advantage of the centrifugal-flow compressor is its high

pressure rise per stage

At what stage in a turbine engine are gas pressures the greatest?

Compressor outlet

At what point in an axial-flow turbojet engine will the highest gas pressures occur?

At the compressor outlet