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Worksheets

DONGCO

Total questions: 150

Worksheet time: 1hrs 15mins

Name
Class
Date
1.

What is (are) the function(s) of aircraft’s engines?

a)

To create necessary movement of the aircraft

b)

To supply bleed air, hydraulic & electric power

c)

Both A & B are correct

d)

Both A & B are wrong

2.

           Which is (are) TRUE about aircraft engines?

a)

Providing thrust                                          

b)

Providing electric power

c)

Both A & B are correct

d)

Both A & B are wrong

3.

            Which is (are) NOT TRUE about aircraft engines?

a)

Use jet fuel

b)

Be turned off during cruise to save fuel

c)

Both A & B are correct

d)

Both A & B are wrong

4.

               Which is (are) TRUE about aircraft engines?

a)

Aircraft can land with all engines are off

b)

Twin engine aircraft can take off with 1 engine

c)

Both A & B are correct

d)

Both A & B are wrong

5.

     Which is (are) TRUE about aircraft engines?

a)

Only need maintenance when it has problem

b)

Need maintenance before each flight

c)

Need maintenance once a year

d)

Need maintenance once a month

6.

      Which is (are) TRUE about aircraft engines?

a)

Not necessary to record maintenance works into technical logbook

b)

Only record major maintenance works into technical logbook

c)

All maintenance works must be recorded into technical logbook

d)

All are wrong

7.

When the altitude of the a/c increases, the thrust which generated by engine?

a)

Increases

b)

Decreases

c)

Remains the same

d)

It depends on engine type

8.

Compare with the piston type engine, the gas turbine engine has

a)

Less fuel efficient

b)

More fuel efficient

c)

Same fuel efficient

d)

All are wrong

9.

Compare with the piston type engine, the gas turbine engine has

a)

Lower performance at higher altitudes

b)

Same performance

c)

Better performance at higher altitudes

d)

All are wrong

10.

Which engine type has the higher weight to power ratio?

a)

Gas turbine engine

b)

Piston type engine

c)

Same

d)

Cannot be compared

11.

  Nowadays, the piston type engines are used on

a)

Large commercial aircraft

b)

Small aircraft

c)

Freighter aircraft

d)

All are wrong

12.

      FOD is

a)

Friendly Object Design

b)

Foreign Object Damage

c)

Fuel On Deck

d)

Fire On Deck

13.

   If ATC receives a report about missing an aircraft’s part from pilot after landing, they will

a)

Immediately request to close the runway of the departure & arrival airport for FOD inspection

b)

Request to put the affected aircraft in a quarantine area

c)

Request technician to inspect the affected aircraft and send report

d)

Accept the report for later investigation, all operation remains normal

14.

          While the engine is running

a)

Do not stand in front of engine

b)

Do not stand behind the engine

c)

Keep the safet distances from the engine as instruction

d)

All the correct

15.

Which statement is correct about turbojet engines

a)

Give high aircraft speed with good engine efficiency

b)

High fuel efficiency

c)

Both A & B are correct

d)

Both A & B are wrong

16.

Which statement is correct about turbojet engines

a)

Both A & B are correct

b)

Both A & B are wrong

c)

Extremely high exhaust gas velocities

d)

Give very high aircraft speed

17.

Which statement is correct about turboprop engines

a)

Good compromise between achievable aircraft speed and fuel efficiency

b)

High thrust

c)

Both A & B are correct

d)

Both A & B are wrong

18.

When the air temperature increases, the thrust of a jet engine

a)

Increases

b)

Remains

c)

Decreases

d)

Unpredictable

19.

When the air pressure increases, the thrust of a jet engine

a)

Increases

b)

 Decreases

c)

Unpredictable

d)

Remains

20.

When the aircraft altitude increases, the thrust of its jet engine

a)

Increases

b)

Decreases

c)

 Unpredictable

d)

Remains

21.

        The advantage(s) of flying at high altitude is (are)

a)

Avoid bird strike

b)

Avoid lightning strike

c)

Save fuel

d)

All are correct

22.

        The risk(s) of flying at low altitude is (are)

a)

Bird ingestion into engine

b)

All are correct

c)

Rain & Cross wind

d)

Lightning strike

23.

        Which is the most dangerous flight phase

a)

Landing

b)

Limb

c)

Cruise

d)

Take-off

24.

The gas turbine engine produces thrust by

a)

Accelerating of ambient air

b)

Heating up the exhausted gas

c)

Both A & B are correct

d)

Both A & B are wrong

25.

Which statement is true about turbojet engine

a)

Is only designed to produce high velocity gas.

b)

Is extremely loud and not very efficient.

c)

Both A & B are wrong

d)

Both A & B are correct

26.

Which statement is true about turboprop engine

a)

Produces thrust by a small acceleration of large quantity of air with a propeller

b)

Converts almost all the gas energy into torque

c)

Both A & B are correct

d)

Both A & B are wrong

27.

Which statement is true about turbofan engine

a)

Is usually twin of triple spool engine.

b)

Both A & B are correct

c)

Convert a large part of gas energy into torque to drive the fan and engine compressors

d)

Both A & B are wrong

28.

The thrust of a turbo fan engine is mainly generated by

a)

The bypass airflow

b)

The airflow goes through the engine core

c)

Ram air

d)

Hot air flow from combustion chamber

29.

What is bypass ratio?

a)

Bypass air flow : Engine core flow

b)

Engine core flow : Bypass air flow

c)

Bypass air flow : Total of bypass & engine core flow

d)

Total of bypass & engine core flow : Bypass air flow

30.

In the comparison between modular and non-modular engine

a)

Modular engine saves weight

b)

Modular engine needs less spare engines in stock

c)

Both A & B are correct

d)

Both A & B are wrong

31.

The advantage of modular engine

a)

No pre-balance is required after a module change

b)

Very often the replacement of a module is considered a minor repair and not a shop repair.

c)

Both A & B are correct

d)

Both A & B are wrong

32.

The advantage of modular engine

a)

No pre-balance is required after a module change

b)

Easy transportation

c)

Reduced need for spare part

d)

All are correct

33.

      Which is NOT TRUE about modular engine

a)

Easy removal of modules

b)

Modules replaceable on-wing

c)

Flexibility at modification changes

d)

All are wrong

34.

The fan blades of a turbofan engine are often made of

a)

Titanium base alloy

b)

Aluminum base alloy

c)

Steel alloy

d)

Nicken alloy

35.

  Which is TRUE about non-modular engine

a)

Easy removal of modules

b)

Flexibility at modification changes

c)

All are wrong

d)

Modules replaceable on-wing

36.

On an axial flow, dual compressor forward fan engine, the fan turns the same speed as the

a)

Low pressure turbine

b)

High pressure turbine

c)

Forward turbine wheel

d)

High pressure compressor

37.

A turbo jet engine gives

a)

Large acceleration to a small mass of air

b)

Large acceleration to a large mass of air

c)

Small acceleration to a large mass of air

d)

Small acceleration to a small mass of air

38.

Bernoulli's Theorem states that at any point in a flow of gas

a)

The total energy remains constant

b)

The dynamic pressure remains constant

c)

The static pressure is less than the dynamic pressure

d)

 The static pressure and dynamic pressure are equal

39.

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

a)

At the compressor outlet

b)

At the turbine entrance

c)

Within the burner section

d)

At the combustion chamber outlet

40.

What section provides proper mixing of the fuel and efficient burning of the gases

a)

Diffuser section and combustion section

b)

Combustion section and compressor section

c)

Mixing chamber

d)

Combustion section only

41.

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

a)

To every action there is an equal and opposite  reaction

b)

Force is proportional to the product of mass and  acceleration

c)

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

d)

All are not correct

42.

The highest pressure in a gas turbine is

a)

At the nozzle exit

b)

At the turbine outlet

c)

Just after the last compressor stage but before the burner

d)

At the burner exit

43.

The density of gas may be expressed as

a)

Volume/weight

b)

Weight/volume

c)

Pressure/weight

d)

Pressure/volume

44.

   In modern commercial aircraft, auto – pilot function

a)

Automatically control aircraft direction

b)

Automatically control aircraft flight level

c)

Automatically control aircraft thrust

d)

All are correct

45.

    In commercial aircraft, auto-pilot function is not available for which flight phase

a)

Take off

b)

Climb

c)

Cruise

d)

Landing

46.

        The purpose of reduction gear is

a)

Reduce rotation speed

b)

Reduce torque moment

c)

Reduce power of axial

d)

Reduce fiction

47.

     The purpose of reduction gear is

a)

Increase rotation speed

b)

Increase torque moment

c)

Increase power of axial

d)

Increase fiction

48.

If you heat the air in a cylinder and the piston is fixed

a)

Pressure will increase

b)

Pressure will decrease

c)

Pressure will increase then decrease

d)

Pressure stays constant

49.

If you heat the air in a cylinder and the piston is allowed to move

a)

Pressure will increase

b)

Pressure will decrease

c)

Pressure stays constant

d)

 Pressure will increase then decrease

50.

Which section of turbo fan engine has the highest airflow temperature

a)

High pressure compressor outlet

b)

High pressure turbine inlet

c)

Combustion chamber

d)

Low pressure turbine

51.

  In turbo engine, most of fuel energy is used for

a)

Driving the compressors

b)

Producing thurst

c)

Heating the airflow

d)

All are wrong

52.

Which section of turbo fan engine has the highest airflow speed

a)

High pressure compressor outlet

b)

High pressure turbine inlet

c)

Combustion chamber outlet

d)

Low pressure turbine outlet

53.

In turbo fan engine, most of fuel energy transforms to

a)

Propulsive energy

b)

Compression energy

c)

Both A & B are wrong

d)

Both A & B are correct

54.

   The most energy loss in gas turbine engine is

a)

Bearing friction

b)

Drag of air flow

c)

Weight of fans, blades & axial

d)

Heat

55.

Which is the highest thrust rating?

a)

Maximum go-around thrust

b)

Maximum climb thrust

c)

Maximum continuous thrust

d)

Maximum cruise thrust

56.

Which is the lowest thrust rating?

a)

 Maximum go-around thrust

b)

Maximum climb thrust

c)

Maximum continuous thrust

d)

Maximum cruise thrust

57.

On a gas turbine engine, a lot of energy is lost because of

a)

Friction of the bearings

b)

High temperature of exhaust gas

c)

Friction of the ambient air

d)

Fuel is not completely burn

58.

Specific fuel consumption (SFC) means

a)

The amount of fuel which an engine need to make 1kN of thrust for 1 hour

b)

The amount of fuel which an engine need to let aircraft fly 1000 km in 1 hour

c)

The amount of fuel which an engine need to let aircraft fly 1000 km

d)

The amount of thrust is made when provide 1000 kg of fuel to engine for 1 hour

59.

   Specific fuel consumption (SFC) = 38 kg/kN.h means

a)

Engine burns 38 kg of fuel to produce 1000 Newton of thrust

b)

Engine burns 38 kg of fuel to produce 1 kilo Newton of thrust in 1 hour

c)

Engine burns 1 kg of fuel to produce 38 kilo Newton of thrust in 1 hour

d)

Engine burns 38 kg of fuel to produce 1 kilo Newton of thrust

60.

  Engine A has SFC = 38 kg/kN.h and Engine B has SFC = 50 kg/kN.h, which statement is (are) correct?

a)

Engine A is stronger than Engine B

b)

Engine A is weaker than Engine B

c)

Engine A save more fuel than Engine B

d)

Engine B save more fuel than Engine A

61.

Maximum go-around thrust rating

a)

Is limited to a few minutes

b)

Is used when aircraft taxi on ground

c)

 Is used when aircraft is waiting for landing

d)

Can be used without limitation

62.

    TOGA means

a)

Take Off / Go Around

b)

Thrust Of Ground Altitude

c)

All are wrong

d)

Thrust Over Go Around

63.

When the engine works at maximum take off thrust exceed the limit time

a)

No problem

b)

It should be replaced for shop overhaul

c)

Let it be cooled by ambient air

d)

Add more lubrication oil to the engine

64.

Maximum continuous thrust rating

a)

Is the highest thrust that an engine is permitted to supply without time limitations

b)

Is the highest thrust that an engine is permitted to supply in 1 hour

c)

Is used for normal cruise flight

d)

Is used for take off

65.

       Maximum continuous thrust rating is used

a)

   During normal climb

b)

All are wrong

c)

During normal cruise

d)

During normal take off

66.

The maximum take-off thrust in a warn day is

a)

Higher than a cold day

b)

Air temperature does not affect the thrust

c)

Lower than a cold day

d)

All are wrong

67.

When start the aircraft engines on an airport at higher altitude

a)

Easier than lower altitude airport

b)

A little difficult than lower altitude airport

c)

The same as lower altitude airport

d)

All are wrong

68.

The purpose of engine air intake is

a)

To smooth the airflow

b)

Both A & B are correct

c)

To increase air static pressure of the air

d)

Both A & B are wrong

69.

Which thermal source is used for engine air intake anti-icing?

a)

Bleed air from engine compressors

b)

Electric power

c)

Hot air from combustion chamber

d)

Bleed air from APU

70.

The supercooled water

a)

Has its temperature below freezing point but not change to solid state.

b)

Is the water at 0 Celsius degree

c)

Both A & B are correct

d)

Both A & B are wrong

71.

If ice is formed on the engine air intake

a)

Compressors stall may be occurred

b)

Ice pieces may be sucked into engine, causing damage of fan blade, compressors…

c)

Both A & B are wrong

d)

Both A & B are correct

72.

For anti-icing, the wing leading edge and engine air intake use

a)

Hot compressed air

b)

Hot air from combustion chamber

c)

Aerodynamic force

d)

Electric power

73.

Which air compressor type has the higher pressure ratio

a)

Centrifugal flow compressor

b)

Axial flow compressor

c)

They are the same

d)

Cannot be compared

74.

In a stage of axial compressor, the stator vanes

a)

Accelerate the airflow

b)

Decelerate the airflow

c)

Provide kinetic energy to the airflow

d)

Increase the airflow’s speed

75.

In a stage of axial compressor, which accelerates the airflow

a)

Rotor

b)

Stator

c)

Shape of the compressor housing

d)

The airflow accelerates itself

76.

In a stage of axial compressor, the stator vanes

a)

Guide the airflow

b)

Slow the airflow to cause an increase in pressure

c)

Both A & B are correct

d)

Both A & B are wrong

77.

In a centrifugal compressor, which accelerates the airflow

a)

Impeller

b)

Diffuser

c)

Compressor manifold

d)

Fan

78.

In a centrifugal compressor, which increases the air pressure

a)

Impeller

b)

Diffuser

c)

Compressor manifold

d)

Fan

79.

The stator vanes in an axial-flow compressor

a)

Direct air into the first stage rotor vanes at the proper angle

b)

Convert velocity energy into pressure energy

c)

Convert pressure energy onto velocity energy

d)

Reduce drag

80.

Which engine compressor type causes less drag

a)

Centrifual compressor

b)

Axial compressor

c)

The same drag

d)

Depend on the size

81.

Which compressor has a high pressure rise per stage

a)

Centrifual compressor

b)

Axial compressor

c)

The same

d)

Depend on the size

82.

How to pick up air bleed from compressor

a)

By using holes in the outer platform of the stator vanes

b)

By using hollow stator

c)

Both A & B are correct

d)

Both A & B are wrong

83.

Compressor stall causes

a)

The airflow to speed up

b)

The airflow to slow down

c)

The air pressure drop suddenly

d)

The engine explose

84.

Compressor surge

a)

Causes a blockage of airflow then airflow comes to stops and reverses its direction

b)

Is a very severe form of compressor stall

c)

Both A & B are correct

d)

Both A & B are wrong

85.

How to prevent stall & surge on modern aircraft engine?

a)

Using compressor bleed valves or variable compressor stator vanes

b)

Using multi-spool engine

c)

Both A & B are correct

d)

A or B

86.

The air flow discharged from VBV will

a)

Go directly to combustion chamber

b)

Go to low pressure turbines

c)

Discharge to bypass airflow

d)

Go to high pressure turbine

87.

The variable stator vanes (VSV)

a)

Are movable along the vertical axis

b)

Can get the optimum angle of attack for every engine speed

c)

Both A & B are correct

d)

Both A & B are wrong

88.

What purpose do the diffuser vanes of a centrifugal compressor serve?

a)

To convert pressure energy into kinetic energy

b)

To increase the air velocity

c)

To increase the air pressure

d)

To convert kinetic energy into pressure energy

89.

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

a)

always turns at the same speed as the high speed compressor

b)

seeks its own best operating speed

c)

is connected directly to the high speed compressor

d)

is connected to the high pressure turbine

90.

Compressor stall is caused by

a)

a low angle of attack airflow through the first stages of compression

b)

a high angle of attack airflow through the first stages of compression

c)

rapid engine acceleration

d)

 rapid engine deceleration

91.

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

a)

Compressor inlet temperature

b)

Number of stages in compressor

c)

Compressor inlet pressure

d)

Length of the compressor

92.

The non-rotating axial-flow compressor airfoils in an aircraft gas turbine are known as

a)

Bleed vanes

b)

Stator vanes

c)

Pressurization vanes

d)

Fan

93.

The energy changes that take place in the impeller of a centrifugal compressor are:

a)

pressure increases, velocity increases, temperature increases

b)

pressure decreases, velocity decreases, temperature decreases

c)

 pressure decreases, velocity decreases, temperature increases

d)

pressure increases, velocity decreases, temperature increases

94.

Which two elements make up the axial flow compressor assembly?

a)

Rotor and stator

b)

Rotor and impeller

c)

Compressor and manifold

d)

Stator and diffuser

95.

      An advantage of the centrifugal flow compressor is its high

a)

ram efficiency

b)

pressure rise per stage

c)

peak efficiency

d)

flow speed

96.

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

a)

Stators

b)

Rotors

c)

Buckets

d)

Fan

97.

A compressor stage stalls when

a)

adiabatic temperature rise is too high

b)

compression ratio is too high

c)

smooth airflow is disrupted

d)

compression ratio is too low

98.

An axial flow compressor surges when

a)

later stages are stalled

b)

all stages are stalled

c)

early stages are stalled

d)

middle stage is stalled

99.

The purpose of a bleed valve, located in the beginning stages of the compressor is to

a)

vent some of the air overboard to prevent a compressor stall

b)

control excessively high RPM to prevent a compressor stall

c)

vent high ram air pressure overboard to prevent a compressor stall

d)

add ram air into compressore to prevent a compressor stall

100.

A high bypass ratio engine LP compressor

a)

high bypass ratio engine LP compressor

b)

Supplies more air than is required for combustion

c)

Supplies only the required quantity for combustion

d)

All are wrong

101.

 

In a twin spool compressor, the LP section runs at

a)

a lower RPM than the HP spool

b)

a lower RPM than the HP spool

c)

a higher RPM than the HP spool

d)

the same RPM than the HP spool

102.

A bypass ratio of 5:1 indicates that the bypass flow is

a)

Equal to 1/5 of the hot stream

b)

Five times the cold stream

c)

Five times the hot stream

d)

Five times the inlet stream

103.

The spiral or white mark on the spinner cone are used to

a)

Anti-ice

b)

Scare the bird away

c)

Decorate

d)

Mark the unbalance point

104.

The spinner cone

a)

Both A & B are correct

b)

Both A & B are wrong

c)

Covers the end of the fan rotor disc

d)

Creates a smooth aerodynamic fairing

105.

On some engines, the spinner cone needs to be heated for anti-icing, it can be done with

a)

Hot air

b)

Electric

c)

Solar power

d)

Ambient air

106.

The fan blades is loose fitted on the rotor disc

a)

Sudden forces or torque loads do not exceed the maximum allowable stress limit of the fan blades

b)

Both A & B are correct

c)

Both A & B are wrong

d)

By the blade retainers or bolts or cylindrical pins

107.

The abradable shroud on the outer wall of the fan case

a)

Lets the fan blades run with small tip clearance & maximum efficiency

b)

Prevents fan blades from contacting fan case

c)

Protects fan blades from FOD

d)

Protects the fan case

108.

The acoustic panels on engine

a)

Both A & B are wrong

b)

Both A & B are correct

c)

Reduce the noise created by the fan

d)

Have many small holes on the surface.

109.

In a turbojet engine, combustion occurs at

a)

Constant velocity

b)

Constant pressure

c)

Constant volume

d)

Constant temperature

110.

In a turboprop engine, combustion takes place at constant

a)

Pressure

b)

Density

c)

Volume

d)

Temperature

111.

The air passing through the combustion chamber is

a)

Used to support combustion and to cool the engine

b)

Speeded up and heated by the action of the turbines

c)

All are correct

d)

Entirely combined with fuel and burned

112.

The air used for combustion is

a)

Primary and secondary

b)

Primary

c)

Secondary

d)

All are correct

113.

The air used for combustion chamber cooling is

a)

Secondary

b)

Primary and secondary

c)

Primary

d)

All are correct

114.

Combustion chamber flame temperature is about

a)

2000 0C

b)

2000 0F

c)

2000 0K

d)

2000C

115.

        In turbo engine, the igniter usually work

a)

During starting

b)

All are wrong

c)

Only 10 minutes at starting

d)

All the time until engine shutdown

116.

  When flying to bad weather zone, the igniters of the engines

a)

Work continuously

b)

Stay on for 30 minutes only

c)

All are wrong

d)

Stay off

117.

   For twin engine aircraft, if 1 engine fail, the igniters of the other engine

a)

Work continuously

b)

Stay on for 30 minutes only to save fuel

c)

All are wrong

d)

Stay off

118.

       In the combustion chamber

a)

Static pressure decreases slightly and volume increases

b)

Static pressure and volume decrease

c)

Static pressure and volume increase

d)

Static pressure and volume remains constant

119.

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

a)

Multiple can, annular, and can-annular

b)

Annular, variable, and cascade vane

c)

Can, triangle can

d)

Can, multiple can, and variable

120.

Another name for a cannular combustion chamber is

a)

turbo-annular

b)

multiple can

c)

can-annular

d)

cannes

121.

Which statement is true regarding the air passing through the combustion section of a jet engine?

a)

Most is used for engine cooling

b)

A small percentage is frequently bled off at this point to be used for air-conditioning and/or other

c)

Only a few amount is used for cooling

d)

Most is used to support combustion

122.

How are combustion liner walls cooled in a gas turbine engine

a)

By secondary air flowing through the combustion chamber

b)

By the pattern of holes and louvers cut in the diffuser section

c)

By ram air

d)

By bleed air vented from the engine air inlet

123.

The approximate percentage of the mass airflow which bypasses the flame tube snout is

a)

~80%

b)

~20%

c)

~50%

d)

~10%

124.

The approximate percentage of the mass airflow which is used for combustion

a)

~10%

b)

~20%

c)

~80%

d)

~50%

125.

Which type of combustion chamber is the most commonly used on modern gas turbine engines

a)

Can

b)

Can-annular

c)

Annular

d)

All are correct

126.

      How to check the condition of combustion chamber

a)

By boroscope inspection

b)

Using pressure sensor

c)

Using temperature sensor

d)

 Using software

127.

  Can a combustion chamber be replaced with engine on-wing?

a)

No, in engine shop only

b)

Yes

c)

Yes, if there is no rain and dust

d)

All are correct

128.

What are the two main basic components of the turbine section in a gas turbine engine?

a)

Stator and rotor

b)

Hot and cold

c)

Impeller and diffuser

d)

Blade and housing

129.

The turbine section

a)

Increases air velocity to create thrust

b)

Uses heat energy to expand and accelerate the gas flow

c)

Drives the compressor section

d)

Produces the jet stream

130.

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

a)

Supplies the power to turn the compressor

b)

Directs the gases in the proper direction to the tailpipe

c)

Increases the temperature of the exhaust gases

d)

Produces the jet stream

131.

Gas pressure through the turbine section will generally

a)

Increase

b)

Remains the same

c)

Decrease

d)

Increase rapidly

132.

Temperature through the turbine stages generally

a)

Remains the same

b)

Decreases

c)

Increases

d)

Is not stable

133.

  Gas speed through the turbine section will generally

a)

Remains the same

b)

Increases

c)

Decreases

d)

In not stable

134.

The turbine section of a jet engine

a)

Converts dynamic pressure into mechanical energy

b)

Circulates air to cool the engine

c)

Extracts heat energy to produce jet stream to cool the engine

d)

Extracts heat energy to drive the compressor

135.

   The turbine clearance control

a)

Keep the tip clearance as small as possible in all operating conditions

b)

Ensure the rotor blades can not make contact with the turbine casing

c)

Both A & B are wrong

d)

Both A & B are correct

136.

      The turbine clearance control

a)

Use air to cool the turbine casings

b)

Use air to cool the turbine blades

c)

Both A & B are correct

d)

Both A & B are wrong

137.

             The turbine clearance control uses which air to cool the high pressure turbine

a)

Fan air

b)

Compressed air from compressors

c)

Ambient air

d)

Air from burner

138.

In turbine section, nozzle guide vanes give a

a)

pressure decreases, velocity increases

b)

pressure increases, velocity decreases

c)

pressure increases, velocity increases

d)

pressure decreases, velocity decreases

139.

  Why are nozzle guide vanes fitted in turbine section ?

a)

To decrease velocity of the gas flow

b)

To increase velocity of the gas flow

c)

To decrease pressure of the gas flow

d)

To increase pressure of the gas flow

140.

 

          In turbine section, a nozzle guide vane is

a)

Hollow in construction to allow for flow of cooling air

b)

Hollow in construction to allow for thermal expansion

c)

Solid in construction to support the guide vane

d)

Solid in construction to get the best strength

141.

  The component(s) in a turbine engine that operate(s) at the highest temperatures is/are the

a)

First stage turbine nozzle guide vanes

b)

Turbine disks

c)

Exhaust cone

d)

Combustion chamber wall

142.

The exhaust system

a)

Guides the exhaust gases from the rear of the turbine to the atmosphere

b)

The main task of exhaust system depends on the type of the gas turbine engine

c)

Both A & B are correct

d)

Both A & B are wrong

143.

       Which type of exhaust system is fitted on turbofan engine ?

a)

Long duct exhaust nozzle

b)

Short duct exhaust nozzle

c)

Both A & B are correct

d)

Both A & B are wrong

144.

On jet engine, the exhaust system

a)

The main task is to accelerate the airflow

b)

Prevents excessive turbulence of the gases

c)

Both A & B are correct

d)

Both A & B are wrong

145.

The engine thrust reversers

a)

Produce braking force by deflecting the exhaust gas stream to the opposite direction

b)

Produce a thrust force opposite to the direction of movement

c)

Both A & B are correct

d)

Both A & B are wrong

146.

The thrust reverser system can be used:

a)

On ground only

b)

In flight only

c)

Both A & B are correct

d)

Both A & B are wrong

147.

On the turbofan engine, the thrust reversers deflect the

a)

Only the fan flow

b)

Only the combusted flow

c)

Both A & B are correct

d)

Both A & B are wrong

148.

Aircraft can use thrust reverser system in flight

a)

To decrease the aircraft speed

b)

To decrease the flight level

c)

Not permitted, it can lead to a crash

d)

To decrease speed for a short time

149.

The engine thrust reversers can

a)

Support the braking system

b)

Both A & B are correct

c)

Both A & B are wrong

d)

Let aircraft move rearward (but not recommend)

150.

The disadvantage(s) of engine thrust reverser system:

a)

Can cause compressor stall

b)

Can whirl up dirt and dust then ingest to engine inlet

c)

Both A & B are correct

d)

Both A & B are wrong

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