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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
red stripe warning placard
Danger zone
26
Engine mounted on a supersonic airplane must convert the flow of air to subsonic by
having normal shockwave or oblique shock wave or multiple oblique shock wave on its inlet.
27
Aircraft is still possible to be released even with defective anti-ice valve (must be locked open, or locked close)
28
– keeps the fan blades deflection within limits during heavy vibration or FOD
Midspan shroud
29
– measure the weight of the fan blade, distance of center of gravity of the blade, measure from CG to axis of rotation
Moment weight
30
– used to compensate the moment weight difference of the fan blades; used to lower N1 vibration
Balance weight/balance screw
31
Installation of compressor rotor blade
axial dovetail slots, circumferential, bolts
32
Part of combustion chamber
flame tube, casing
33
Continuous supply of fuel & air
maintains the combustion
34
Air in the combustion chamber
for cooling, for combustion
35
– multiple flame tubes
Can type & can-annular type
36
– used for inspection in the combustion chamber
Borescope
37
– transfer of flame
Interconnection tube
38
– accelerates the airflow in the turbine
Nozzle guide vanes
39
– damage due to application of centrifugal loads
Creep
40
Why does turbine blade rotate?
Because of the impact of the air flow coming from the nozzle guide vanes
41
– turbine rotates due to the airflow’s impact coming from the nozzle guide vanes
Impulse turbine
42
– turbine rotates due to the airflow’s impact coming from nozzle guide vanes, and because of the accelerated airflow of the rotor
Impulse reaction turbine
43
– turbine rotates due to the airflow’s impact coming from nozzle guide vanes, and because of the accelerated airflow of the rotor
Impulse reaction turbine
44
Part of the engine with clearance control
HPT LPT HPC
45
Turbine case cooling system
active & passive
46
Where is the engine mounted
turbine frame (aft mount), fan frame (fwd mount)
47
How does the thrust reverser work
deflects the rearward airflow in the opposite direction
48
Main parts of accessory drive system
internal gearbox, transfer gearbox, accessory gearbox, radial and horizontal driveshaft
49
There are either one (1) or two (2) Accessory gearbox (depends)
50
Two gearbox
high speed, low speed
51
– gearbox driven by LP rotor
Low speed gearbox
52
Installation of accessory gearbox
bolted, v-clamp, QAD ring
53
Accessory gearbox location?
is located on the side or below the engine
54
– used to seal the gap between the bearing compartment walls and the engine shaft
Carbon seal
55
Types of bearing
– ball bearing, roller bearing
56
– equalize the two axial loads in the opposite direction; reduce the axial loads to the fixed bearing
Pressure balancing
57
Two ways of (bearing) lubrication
– direct lubrication, under race lubrication
58
Two types of lubricants/oils
– synthetic, mineral
59
Synthetic oils are impossible to mixed
60
– returns the oil from the bearing compartments and the gearboxes to the oil tank
Scavenge system
61
– oil quantity, oil pressure, oil temperature, low oil pressure switch, filter clogging switch
Oil monitoring system sensors
62
– quantity, temperature, pressure (measured by oil monitoring system)
Information of the oil system that is always displayed
63
– located above the oil tank. No need to drain the oil tank when replacing an oil quantity transmitter
Oil quantity transmitter
64
– has two tube connections; pressure difference between the total pressure in the supply line and the vent pressure in the supply pump.
Oil pressure transmitter
65
Oil temperature system is installed in scavenge line or supply line
66
How many component monitors the oil pressure
2
67
– located can either be on supply line or scavenge line
Oil temperature sensor
68
– used to determine if fuel is contaminated
SOAP analysis

M14 (8 decks)

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