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Aircraft Engines & Propulsion

Total questions: 65

Worksheet time: 22mins

Name
Class
Date
1.

Put the four main stages of engine operation in order:

a)

intake

b)

compression

c)

power

d)

exhaust

1)
2)
3)
4)
2.

Which component of a jet engine is responsible for compressing the incoming air before it enters the combustion chamber?

a)

Turbine

b)

Compressor

c)

Nozzle

d)

Fan

3.

In a turboprop engine, what is the primary function of the propeller?

a)

To increase the engine's thrust by accelerating air

b)

To cool the engine components

c)

To reduce noise levels

d)

To stabilize the aircraft

4.

What is the main difference between a turbojet and a turbofan engine?

a)

Turbojets are more fuel-efficient than turbofans

b)

Turbofans have a bypass air stream, while turbojets do not

c)

Turbojets are quieter than turbofans

d)

Turbofans are used only in military aircraft

5.

What is the role of the turbine in a jet engine?

a)

To compress the air entering the engine

b)

To extract energy from the exhaust gases

c)

To ignite the fuel-air mixture

d)

To direct the exhaust flow

6.

In a turboprop engine, what component connects the turbine to the propeller?

a)

Gearbox

b)

Shaft

c)

Nozzle

d)

Combustion chamber

7.

What is a key advantage of turbofan engines over turbojet engines?

a)

Higher speed capability

b)

Greater fuel efficiency

c)

Simpler design

d)

Lower maintenance cost

8.

Which of the following is a measure of an engine's efficiency in converting fuel into thrust?

a)

Specific fuel consumption

b)

Thrust-to-weight ratio

c)

Power output

d)

Thermal efficiency

9.

What is the primary purpose of the combustion chamber in a jet engine?

a)

To cool the air before it enters the turbine

b)

To mix fuel with air and ignite the mixture

c)

To increase the pressure of the air

d)

To direct the exhaust gases

10.

In a turboprop engine, what is the main advantage of using a propeller?

a)

Higher speed at high altitudes

b)

Better fuel efficiency at lower speeds

c)

Reduced noise levels

d)

Increased engine lifespan

11.

What is the primary function of the fan in a turbofan engine?

a)

To increase the speed of the aircraft

b)

To cool the engine components

c)

To provide additional thrust by moving a large volume of air

d)

To reduce engine noise

12.

Which performance metric is used to compare the thrust produced by an engine to its weight?

a)

Specific fuel consumption

b)

Thrust-to-weight ratio

c)

Power-to-weight ratio

d)

Thermal efficiency

13.

What is the primary function of a propulsion system?

a)

To generate thrust

b)

To reduce drag

c)

To increase lift

d)

To reduce fuel consumption

14.

Which component in a turbojet engine increases air pressure?

a)

Nozzle

b)

Compressor

c)

Turbine

d)

Inlet

15.

Which engine type is most suited for high-speed, supersonic flight?

a)

Ramjet

b)

Turboprop

c)

Turboshaft

d)

Piston engine

16.

Which engine type is mainly used in helicopters?

a)

Turbojet

b)

Turboprop

c)

Turboshaft

d)

Ramjet

17.

Which type of propulsion system is most commonly used for commercial aircraft?

a)

Ramjet

b)

Turboshaft

c)

Turbofan

d)

Piston engine

18.

Compare and contrast the efficiency of turbojet and turbofan engines in aircraft propulsion systems.

a)

Turbojets are more efficient at lower speeds, while turbofans are more efficient at higher speeds.

b)

Turbojets are more efficient at higher speeds, while turbofans are more efficient at lower speeds.

c)

Both turbojets and turbofans have the same efficiency at all speeds.

d)

Turbojets are more efficient at all speeds compared to turbofans.

19.

Explain how the thrust-to-weight ratio affects the performance of an aircraft.

a)

A higher thrust-to-weight ratio generally improves an aircraft's acceleration and climb rate.

b)

A higher thrust-to-weight ratio generally decreases an aircraft's acceleration and climb rate.

c)

The thrust-to-weight ratio has no impact on an aircraft's performance.

d)

A higher thrust-to-weight ratio generally improves an aircraft's fuel efficiency.

20.

The Bypass Ratio of an engine is the ratio of:

a)

A) primary air to tertiary air

b)

B) cold stream air to that flowing through the hot core of the engine

c)

C) exhaust gas pressure to air intake pressure

d)

D) primary air to secondary air

21.

A Bypass Ratio of 5:1 means that:

a)

A) 5 pounds of air is bypassed for every 10 pounds entering the engine intake

b)

B) 5 pounds of goes through the HP compressor for every 10 pounds that enters the intake

c)

C) 10 pounds of air goes through the bypass for every 5 pounds that enters the intake

d)

D) 5 pounds of air is bypassed for every 1 pound that goes through the hot core of the engine

22.

Why can't the fan size in turbofan engines be infinitely large?

a)

Limited by the speed of sound

b)

Because of ground clearance issues

c)

Due to weight constraints

d)

All of these

23.

What is the primary reason for employing a low bypass ratio in some turbofans?

a)

To reduce engine noise

b)

To improve crusing efficiency

c)

To increase fuel efficiency

d)

To decrease air intake

24.

What is the main function of afterburners in a jet engine?

a)

To cool down the engine

b)

To reduce engine noise

c)

To increase thrust dramatically

d)

To improve fuel efficiency

25.

Four-stroke engines are commonly installed on handheld power equipment due to their smaller size and reduced weight.

a)

True

b)

False

26.

Which is an example of an aircraft with a turboshaft engine?

a)

b)

c)

d)

27.

A turbo- shaft or turbo-prop engine can be thought of as a

a)

mix of fuel and air

b)

mix between a donkey and a horse

c)

blend of efficiency and practicality

d)

hybrid of a jet and a propeller engine

28.

What happens in the combustion chamber?

a)

Air is cooled and mixed with oil.

b)

Bypass air and fuel are ignited.

c)

Fuel and air mix and burn.

29.

What is the name of the section labeled B?

a)

Combustor

b)

Compressor

c)

Fan

d)

Turbine

30.

What is the name of the section labeled D?

a)

Combustor

b)

Compressor

c)

Fan

d)

Turbine

31.

In the ____, fuel is injected and mixed with air, then ignited.

a)

Combustor

b)

Compressor

c)

Fan

d)

Turbine

32.

The ____ extracts energy from the air flow, which is used to spin the compressor and fan (which continues the cycle).

a)

Combustor

b)

Intake

c)

Exhaust

d)

Turbine

33.

What is the benefit to a low-bypass jet engine?

a)

Supersonic Flight

b)

More compact

c)

Afterburner modifications available

d)

All of the above

34.

What is the benefit to a HIGH bypass jet engine?

a)

Much quieter than other engine options

b)

More efficiency

c)

Higher thrust (non-afterburning)

d)

All of the above

35.

Why would high bypass air benefit commercial aircraft?

a)

Bypass air surrounds the hot jet exhaust and makes the aircraft quieter

b)

Bypass air powers all of the electronics that passengers need for their iphones

c)

Bypass air is clean so it reduces the aircraft's carbon footprint

d)

High bypass engines are only in military aircraft.

36.

Which type of engine is typically found in small (personal) aircraft?

a)

Propellor

(Reciprocating)

b)

Turbojet

c)

Turbofan

d)

Turboprop

e)

Afterburning

Turbojet

37.

Which type of engine is typically found in low-speed transport aircraft and small commuter planes?

a)

Propellor

(Reciprocating)

b)

Turbojet

c)

Turbofan

d)

Turboprop

e)

Afterburning

Turbojet

38.

Icing can be a problem with ____ engines.

a)

Propellor

(Reciprocating)

b)

Turbojet

c)

Turbofan

d)

Turboprop

e)

Afterburning

Turbojet

39.

Which engine is easily identified by its large air intake?

a)

Propellor

(Reciprocating)

b)

Turbojet

c)

Turbofan

d)

Turboprop

e)

Afterburning

Turbojet

40.

Which type of engine is typically found in military fighter jets?

a)

Propellor

(Reciprocating)

b)

Turbojet

c)

Turbofan

d)

Turboprop

e)

Afterburning

Turbojet

41.

____ engines are known for their high thrust, giving the aircraft speed and maneuverability.

a)

Propellor

(Reciprocating)

b)

Turbojet

c)

Turbofan

d)

Turboprop

42.

Which type of engine has a bypass ratio of 0?

a)

Turbojet

b)

Turbofan

c)

Turboprop

d)

Afterburning

Turbojet

43.

Which type of engine produces the MOST thrust?

a)

Turbojet

b)

Turbofan

c)

Turboprop

44.

Which type of engine produces the LEAST thrust?

a)

Turbojet

b)

Turbofan

c)

Turboprop

45.

Which type of engine is the MOST fuel-efficient?

a)

Turbojet

b)

Turbofan

c)

Turboprop

46.

Which type of engine is the LEAST fuel-efficient?

a)

Turbojet

b)

Turbofan

c)

Turboprop

47.

Which type of engine could have a bypass ratio of 50?

a)

Turbojet

b)

Turbofan

c)

Turboprop

d)

Afterburning

Turbojet

48.

A(n) ___ engine would help exceed the drag that an aircraft experiences close to the sound barrier.

a)

Turbojet

b)

Turbofan

c)

Turboprop

d)

Afterburning

Turbojet

49.

A(n) ___ engine suffers from extremely inefficient combustion, so it uses a lot of fuel.

a)

Turbojet

b)

Turbofan

c)

Turboprop

d)

Afterburning

Turbojet

50.

A(n) ___ engine combines high and low speed AND altitude performance.

a)

Turbojet

b)

Turbofan

c)

Turboprop

d)

Afterburning

Turbojet

51.

Which type of engine could have a bypass ratio of 9?

a)

Turbojet

b)

Turbofan

c)

Turboprop

d)

Afterburning

Turbojet

52.

____ prepares the air for combustion by adding energy in the form of pressure and heat.

a)

intake

b)

compression

c)

power

d)

exhaust

53.

Compression makes for a more powerful reaction relative to _____.

a)

aircraft weight

b)

engine size

c)

air pressure

d)

engine type

54.

(a)   air travels around (not through) the engine core.

55.

How does a turbojet work? Put the following steps in order:

a)

Fan blades compress incoming air

b)

Fuel is added so air temperature increases

c)

Expanding air releases energy

d)

Fast-moving exhaust creates thrust

1)
2)
3)
4)
56.

When compared with a two-stroke engine, four-stroke engines are ____ and ____.

a)

quieter

b)

more fuel efficient

c)

more powerful

57.

Label each type of engine.

a)Turboprop
b)Afterburning Turbojet
c)Turbofan
d)Turbojet
1
2
3
4
1)
2)
3)
4)
58.

High bypass engines are ​ (a)   , and ​ (b)   than standard turbojet engines.

Choose from the below words
more efficient
less efficient
larger
smaller
59.

The compressor in a gas turbine engine acts like many rows of airfoils, with each row producing a small jump in ____.

a)

temperature

b)

pressure

c)

volume

d)

airspeed

60.

Turbojets are ​ (a)   and have lower ​ (b)   .

Turbofans are ​ (c)   and have lower ​ (d)   .

Choose from the below words
louder
fuel efficiency
quieter
thrust
61.

Which words correctly fill in the blanks?

Commercial aircraft typically have a ___ bypass ratio.

Military aircraft typically have a ___ bypass ratio.

a)

high

high

b)

low

low

c)

high

low

d)

low

high

62.

How is engine performance impacted when altitude and airspeed are increased?

Thrust ___ and specific fuel consumption (SFC) ___.

a)

increases, increases

b)

decreases, decreases

c)

increases, decreases

d)

decreases, increases

63.

Which is the LEAST likely to be a bypass ratio for a turbofan?

a)

0.1

b)

3

c)

7

d)

9

64.

Which aircraft is LEAST likely to be powered by a turbofan engine?

a)

Cessna

b)

Boeing 777

c)

Airbus A380

65.

This is most likely a ____ engine.

a)

Turbojet

b)

Turbofan

c)

Turboprop

d)

Afterburning

turbojet

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