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M15 GTE > Fundementals > Flashcards

Fundementals Flashcards

1
Q

What is acceleration due to gravity

A

9.8 m/s2

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2
Q

Force formula

A

Mass x acceleration

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3
Q

Weight formula

A

Mass x acceleration due to gravity

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4
Q

Newton conversion

A

Kg x m/s2

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5
Q

GTE Working cycle

A
  1. Induction
  2. Compression
  3. Combustion
  4. Exhaust
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6
Q

Work done formula

A

Force x distance

SI Unit = Joules

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7
Q

Power formula

A

Work / Time

SI Unit = Watts

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8
Q

What are the 2 types of mechanical energy

A

Potential and kinetic

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9
Q

What is potential energy

A

Energy a body has due to a virtue of position

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10
Q

What is kinetic energy

A

Energy a body has by virtue of motion

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11
Q

Newtons first law

A

Law of inertia

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12
Q

Newton’s second law

A

Acceleration produced in a mass by a force acting on it directly proportional to the force and inversely proportional to the mass

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13
Q

Newton’s third law

A

Every action has an opposite and equal reaction

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14
Q

What is the brayton cycle

A

Working cycle of GTE

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15
Q

What is a piston engine peak pressure

A

Excess of 1000psi

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16
Q

Within the Brayton cycle what increases

A

Velocity of air & Pressure energy

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17
Q

What happens during combustion in regards to volume and pressure

A

Pressure of air doesn’t rise during combustion however volume does

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18
Q

What is isobaric heating

A

Heating at constant pressure

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19
Q

What’s the difference between piston engine and GTE working cycle

A

Piston is intermittent whereas GTE is continuously

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20
Q

How is energy converted back to kinetic energy

A

High velocity jet efflux

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21
Q

What’s the function of aircraft engines

A

Creates necessary movement on aircraft which is thrust

Supplies hydraulic power , electric power , bleed air for pneumatic system

22
Q

2 types of engines

A

Piston engine and Gas Turbine

23
Q

Advantage of piston aircraft

A

More efficient

24
Q

Disadvantages of piston aircraft

A

Performance decreases as altitude increases

Too large for aircraft as ratio of weight to power decreases

25
Q

What is Jet Propulsion

A

Force to move aircraft forward

26
Q

How does a reaction engine work

A

Use newtons law of motion

27
Q

What’s needed to accelerate air

A

Pressure needs to be increased

28
Q

What are the 4 types of Gas Turbine

A
  1. Turbojet
  2. Turbofan
  3. Turboprop
  4. Auxiliary Power Unit
29
Q

What is bypass ratio

A

Air coming into fan duct vs air into core

30
Q

How can you identify a turbojet engine

A

No fan in front of

31
Q

How can you identify a Turbofan aircraft

A

Fan in front

32
Q

How can you identify a Turboprop aircraft

A

Propeller in front of

33
Q

When is a turbojet engine used

A

High speed aircraft

34
Q

Disadvantage with turbojet engine

A

Very loud and inefficient

35
Q

What is turbofan engine a combination with of

A

Combines advantages of turbojet & turboprop

36
Q

Turbofan engine is what kind of engine

A

Twin or triple spool

37
Q

What is total thrust in turbofan engines

A

Thrust developed by core engine + Fan

38
Q

Advantage and disadvantage of turboprop engines

A

Efficient but not at high speeds

39
Q

In a turbofan how much thrust does the fan produce

A

More then 80% of total thrust

40
Q

Turbofan bypass ratio

A

Between 4:1 & 9:1

41
Q

Aircraft engine bypass ratio

A

90:1

42
Q

Advantage of aircraft engine in terms of fuel

A

Use 20% less fuel then high bypass engines

43
Q

2 types of engine construction

A

Modular and non-modular

44
Q

What is modular construction

A

Engine can be separated into sub major modules

45
Q

What is non-modular construction

A

Weight saving construction but complicated to repair and difficult to access parts

46
Q

What’s aluminium alloy used for

A

Low loaded parts of fan module such as gearbox housing & fan stator castings

47
Q

Where is ceramic alloy used

A

Heat and corrosion protection such as combustor and HP turbine

48
Q

Where is steel alloy used

A

N1 drive shaft
Engine bearings
Main structural frames on engines
Intermediate case & turbine exhaust

49
Q

Where is cobalt alloy used

A

High heat resistance when stator in first stage of high pressure turbine

50
Q

Where is Titanium alloy used

A

High centrifugal force areas such as LP compressor & front stage of HP compressor

51
Q

Where is nickel base alloy used

A

High centrifugal loads at high temperatures

HP Compressor & combustion section for high and low pressure turbines

M15 GTE (19 decks)

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