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SMA > Jet Propuslion > Flashcards

Jet Propuslion Flashcards

1
Q

Jet Propulsion refers to that action which is produced by the ejection of

A

Air, another gas, or liquid

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2
Q

Newtons Third Law

A

For every action there is a reaction

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3
Q

Jet Engine Operation requires what?

A

Force to over come drag

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4
Q

A jet engine develops thrust by

A

Burning a combustible fuel mixture and changing the energy of the expanding gases into a propulsive force.

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5
Q

What is the four cycle process of a a jet engine

A

Intake, Compression, Combustion & Exhaust

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6
Q

Name the sections of a jet engine

A

Air Inlet, Compressor, Diffuser, combustion, turbine, exhaust, accessory

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7
Q

What is the purpose of the Air Inlet Section?

A

Designed to channel incoming air into the compressor

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8
Q

What recovers as much total pressure as possible and delivers it to the front of the engine?

A

Air Inlet Section

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9
Q

What are the three types of jet engines

A

Turbojet, Turbofan, Turboprop

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10
Q

What section delivers air to the compressor inlet with a minimum of turbulence and pressure variation

A

Air Inlet Section

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11
Q

What jet engine section is made up of pair of rotors and stators?

A

Compressor Section

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12
Q

What is the primary function of the Compressor Section?

A

To supply air in sufficient quantity to produce the required engine thrust.

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13
Q

What is made of blades fixed on a spindle

A

Rotor

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14
Q

What turns at high speed, takes air at the compressor inlet and impels it through a series of stages

A

Rotor

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15
Q

The rotating rotor action….

A

Compresses the air at each stage and accelerates it rearward.

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16
Q

What section of the compressor consists of stationary blades fixed withing the engine that acts as a diffuser at each stage of the compressor partially converting high velocity to pressure?

A

Stators

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17
Q

What consists of a consecutive pair of rotor and stator blades?

A

Compressor Stage

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18
Q

Slows down and evenly spreads out the compressors discharge air for combustion.

A

Diffuser Section

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19
Q

Combustion Section consists of

A

Burner Cans, Igniter Plugs and Fuel Nozzles

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20
Q

What section of the jet engine raises the temperature of the air passing through the engine and directs the super-heated air to the turbine?

A

Combustion Section

21
Q

What section transforms part of the exhaust gas energy into mechanical energy to drive the compressor and accessory gearbox?

A

Turbine Section

22
Q

The turbine section absorbs ___ to ____ percent of the total pressure energy from combustion exhaust gas?

A

60 to 80 percent

23
Q

The Turbine Section consists of ____ and _____ the same as the compressor section

A

Rotors and Stators

24
Q

What is another name for Turbine Guide Vanes?

A

Stators (Turbine)

25
Q

What is another name for the “Turbine Wheel?”

A

Rotor (Turbine)

26
Q

Stators (turbine guide vanes) discharge gas at extremely high speed directly onto the ________

A

Rotor Assembly

27
Q

What part of the the turbine section experiences severe centrifugal loads and extreme high temperatures?

A

Rotor (Turbine wheel)

28
Q

What is the combination of the compressor and turbine rotors on a common shaft?

A

Engine Rotor Assembly

29
Q

What directs the flow of hot gases leaving the turbine section?

A

Exhaust Section

30
Q

Provides space for accessories necessary for operation and control of the engine.

A

Accessory Section

31
Q

The accessory sections consists of the following…

A

Electric generator, hydraulic, oil and fuel pumps.

32
Q

What type of jet engine is a straight gas turbine engine that gets its thrust by accelerating a mass of air through the engine?

A

Turbojet

33
Q

What is the advantage of a turbojet engine?

A

Best at high speeds for high speed aircraft like fighters.

34
Q

What are the two disadvantages of a turbojet engine?

A
  1. Cannot produce high thrust at low altitudes and low airspeed.
  2. Need long runways and have poor climb out capabilities (poor rate of climb)
35
Q

What type of engine combines the thrust developed by the propeller and the thrust produced by the exhaust gases at the exhaust nozzle?

A

Turboprop

36
Q

What are the sections of the turboprop engine?

A

Prop, gearbox, shaft, compressor, combustion chamber, turbine, exhaust

37
Q

____ percent of the power produced converts to shaft horsepower driving the propeller reduction gears and accessories of a turboprop engine?

A

90%

38
Q

A turboprop produces ____ percent of thrust as the gases exit out of the exhaust nozzle.

A

10%

39
Q

What are the advantages of a turboprop engine?

A
  1. Develops high thrust at low altitudes

2. Ideal for lifting heavy loads off short runways and medium length runways.

40
Q

What is a disadvantage of the turboprop engine?

A

Propeller efficiency drops off as airspeed and altitude increase.

41
Q

What transmits power from the engine to the reduction gear assembly in a turboprop engine?

A

Extension Shaft Assembly

42
Q

What section of the turboprop engine engine reduces the high speed of the turbine engine to a suitable propeller speed

A

Reduction Gear Assembly

43
Q

The rear case of the Reduction Gear Assembly can be used for mounting what engine accessories on a turboprop engine?

A
  1. AC Generator
  2. Hydraulic Pump
  3. Tachometer
  4. Oil pump
  5. Pneumatic starter
44
Q

What type of jet engine has an axial fan enclosed in the engine case instead of a geared propeller?

A

Turbofans

45
Q

Turbofan engines produce between _____ and ____ percent of total thrust.

A

30 and 85 percent

46
Q

What type of jet engine combines the good operating efficiency and high thrust capability of the turboprop with the high speed, high altitude capability of the turbojet?

A

Turbofan

47
Q

What are the advantages of a turbofan engine?

A
  1. more efficient cruise trust and lower fuel consumption than a turbojet
  2. Less weight, increased ground clearance, higher altitudes, more economical
  3. Less noise at higher thrust settings
48
Q

What jet engine type is most ideal power plant for all large conventional military aircraft?

A

Turbofan

49
Q

What is the disadvantage to the Turbofan engine?

A

No Major advantages.

SMA (30 decks)

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