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M14 > 1 > Flashcards

1 Flashcards

1
Q

What Engine provides?

A
  • bleed air
  • hydraulic
  • engine thrust
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2
Q

4 types of gas turbine engine

A
  • turbo fan
  • turbojet
  • turboprop
  • turboshaft
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3
Q

thermodynamic cycles used in gas turbine engine

A

Brayton cycle

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4
Q

Principle of jet propulsion is based on

A

Newton’s third law of motion

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5
Q

thrust produced by the fan, thrust produced by the core engine

A

Thrust produced by a turbofan engine

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6
Q

Turbofan has

A

primary airflow (core engine) and secondary airflow

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7
Q

ratio of the secondary and primary airflow

A

Bypass ratio

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8
Q

Construction of turbine

A
  • modular
  • non-modular
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9
Q

no rebalancing is required

A

Modular

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10
Q

requires rebalancing

A

Non-modular

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11
Q

protects the combustion section and high turbine section from heat
and corrosion

A

Ceramic coating

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12
Q

have same strength with steel-based alloy but half as heavy as steel-based alloy

A

Titanium-based alloys

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13
Q

3 main section of Gas Turbine Engine

A

compressor, combustion, turbine

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14
Q

Major component in Gas Turbine Engine drives the compressor and accessory gearbox

A

Turbine

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15
Q

Two kinds of ducting

A
  • divergent duct
  • convergent duct
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16
Q

airflow velocity decreases, pressure and temperature increase

A

Divergent duct (narrow to wide)

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17
Q

airflow velocity increases

A

Convergent duct (wide to narrow)

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18
Q

increases the velocity at the exhaust

A

Jet nozzle

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19
Q

Working Cycle of a Gas Turbine Engine

A

induction, compression, combustion, expansion

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20
Q

part of the engine where temperature and pressure is measured

A

Engine station numbers

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21
Q

the effect if there’s a high pressure ratio

A

High EGT

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22
Q

amount of fuel the engine needs to make 1kN of thrust in 1hr

A

Thrust specific fuel consumption

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23
Q

only used for few minutes due to so much stressed produced to the engine

A

TOGA (Take off Go around)

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24
Q

fixed limitation for maximum thrust of engine

A

Flat rating

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25
Q

red stripe warning placard

A

Danger zone

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26
Q

Engine mounted on a supersonic airplane must convert the flow of air to subsonic by

A

having normal shockwave or oblique shock wave or multiple oblique shock wave on its inlet.

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27
Q

Aircraft is still possible to be released even with defective anti-ice valve (must be locked open, or locked close)

A
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28
Q

– keeps the fan blades deflection within limits during heavy vibration or FOD

A

Midspan shroud

29
Q

– measure the weight of the fan blade, distance of center of gravity of the blade, measure from CG to axis of rotation

A

Moment weight

30
Q

– used to compensate the moment weight difference of the fan blades; used to lower N1 vibration

A

Balance weight/balance screw

31
Q

Installation of compressor rotor blade

A

axial dovetail slots, circumferential, bolts

32
Q

Part of combustion chamber

A

flame tube, casing

33
Q

Continuous supply of fuel & air

A

maintains the combustion

34
Q

Air in the combustion chamber

A

for cooling, for combustion

35
Q

– multiple flame tubes

A

Can type & can-annular type

36
Q

– used for inspection in the combustion chamber

A

Borescope

37
Q

– transfer of flame

A

Interconnection tube

38
Q

– accelerates the airflow in the turbine

A

Nozzle guide vanes

39
Q

– damage due to application of centrifugal loads

A

Creep

40
Q

Why does turbine blade rotate?

A

Because of the impact of the air flow coming from the nozzle guide vanes

41
Q

– turbine rotates due to the airflow’s impact coming from the nozzle guide vanes

A

Impulse turbine

42
Q

– turbine rotates due to the airflow’s impact coming from nozzle guide vanes, and because of the accelerated airflow of the rotor

A

Impulse reaction turbine

43
Q

– turbine rotates due to the airflow’s impact coming from nozzle guide vanes, and because of the accelerated airflow of the rotor

A

Impulse reaction turbine

44
Q

Part of the engine with clearance control

A

HPT LPT HPC

45
Q

Turbine case cooling system

A

active & passive

46
Q

Where is the engine mounted

A

turbine frame (aft mount), fan frame (fwd mount)

47
Q

How does the thrust reverser work

A

deflects the rearward airflow in the opposite direction

48
Q

Main parts of accessory drive system

A

internal gearbox, transfer gearbox, accessory gearbox, radial and horizontal driveshaft

49
Q

There are either one (1) or two (2) Accessory gearbox (depends)

A
50
Q

Two gearbox

A

high speed, low speed

51
Q

– gearbox driven by LP rotor

A

Low speed gearbox

52
Q

Installation of accessory gearbox

A

bolted, v-clamp, QAD ring

53
Q

Accessory gearbox location?

A

is located on the side or below the engine

54
Q

– used to seal the gap between the bearing compartment walls and the engine shaft

A

Carbon seal

55
Q

Types of bearing

A

– ball bearing, roller bearing

56
Q

– equalize the two axial loads in the opposite direction; reduce the
axial loads to the fixed bearing

A

Pressure balancing

57
Q

Two ways of (bearing) lubrication

A

– direct lubrication, under race lubrication

58
Q

Two types of lubricants/oils

A

– synthetic, mineral

59
Q

Synthetic oils are impossible to mixed

A
60
Q

– returns the oil from the bearing compartments and the gearboxes to the oil tank

A

Scavenge system

61
Q

– oil quantity, oil pressure, oil temperature, low oil pressure switch, filter clogging switch

A

Oil monitoring system sensors

62
Q

– quantity, temperature, pressure (measured by oil monitoring system)

A

Information of the oil system that is always displayed

63
Q

– located above the oil tank. No need to drain the oil tank when replacing an oil quantity transmitter

A

Oil quantity transmitter

64
Q

– has two tube connections; pressure difference between the total pressure in the supply line and the vent pressure in the supply pump.

A

Oil pressure transmitter

65
Q

Oil temperature system is installed in scavenge line or supply line

A
66
Q

How many component monitors the oil pressure

A

2

67
Q

– located can either be on supply line or scavenge line

A

Oil temperature sensor

68
Q

– used to determine if fuel is contaminated

A

SOAP analysis

M14 (8 decks)

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