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M15 - Retake > Fundermentals > Flashcards

Fundermentals Flashcards

1
Q

Equation of Force

A

F=Mass x Acceleration

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2
Q

Equation of Weight

A

W=Mass x Gravity

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3
Q

What is work

A

Work is done when an object is moved over a distance

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4
Q

Equation of Work

A

W=Force/Distance

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5
Q

What is Power

A

The rate of doing work

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6
Q

Equation of Power

A

P=Work/Time

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7
Q

Unit of Force

A

Newton

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8
Q

Unit of Weight

A

Newton

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9
Q

Unit of Power

A

Watt

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10
Q

Unit of Work

A

Joule

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11
Q

Two Mechanical energy

A

Potential

Kinetic

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12
Q

What is potential energy

A

The energy a body has by virtue of its position

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13
Q

Equation of PE

A

PE=mgh

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14
Q

What is kinetic energy

A

The energy a body has by virtue of its motion

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15
Q

What is the equation of Kinetic energy

A

KE=1/2 x m x v^2

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16
Q

Newton’s First Law

A

Body will remain at rest or at a constant velocity unless an external force acts on it

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17
Q

Newton’s second law

A

The force on a mass causing it to accelerate is directly proportional to the force
F=ma

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18
Q

Newton’s third law

A

Every action has an equal and opposite reaction

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19
Q

The brayton cycle

A

The GTE is a heat engine using air as a working fluid to provide heat

20
Q

Intermittent / continuous

A

Piston eng = intermittent

Turbine eng = continuous

21
Q

Does pressure rise during combustion in a GTE eng

A

No, as it is not an I closed space

22
Q

Does volume increase or decrease in a piston eng

A

Increase

23
Q

Isobaric heating

A

There are no peak or fluctuating pressures

24
Q

High/low octane fuel

A

Piston eng = high octane fuel

GTE eng = lower octane fuel

25
Q

Turbo fan

A

Used on modern A/C high speeds, good efficiency

26
Q

Turbo jet

A

Older type of GTE, very high speeds, very loud, large fuel intake

27
Q

Turbo prop

A

Shaft power only, good speed for A/C size, good fuel efficiency

28
Q

APU

A

Supplies electrical and pneumatic power

29
Q

What is Jet propulsion

A

The propelling Force, which is generated in the opposite direction to the flow of mass
Called a reaction engine

30
Q

How do we accelerate air

A

Increase pressure

31
Q

Thrust of a turbo jet

A

Produces thrust by accelerating ambient air, produce high velocity gasses
Loud and not efficient

32
Q

Thrust of a turbo prop

A

Produces thrust by accelerating a large amount of air with a propeller,
Prop is driven by the compressor or by a free turbine along a long centre drive shaft,
Reduction gear box is required,
Convert gas energy into torque,
Very efficient, not high speed

33
Q

Thrust of a turbo fan

A 
Usually twin or triple spool,
Fan is driven by turbine,
No reduction gearbox,
Large amount of gas converted into torque to tribe fan and compressor, rest into thrust,
Fan can produce 80% thrust
34
Q

Bypass ration on a turbo fan

A

4:1 - 9:1

35
Q

Prop fans

A

Number of fans and the shape allows the engines to have good speeds and alt capabilities
20% less fuel
Bypass ratio = 90:1

36
Q

Non modular construction

A

Saves weight, complicated/difficult to access parts, older type

37
Q

Modular construction

A

Modern design, pre assembled/balanced, easier to work on, easy to remove parts

38
Q

Major modules of modular construction

A

Fan, core, accessory drive, LP turbine

39
Q

Eng materials characteristics

A

Strong, lightweight and cheap

40
Q

Al alloy

A

Gearbox housing, fan stator casings, fan module parts

41
Q

Ceramic

A

Combustor and HP turbine

42
Q

Steel alloys

A

N1 drive shaft, eng bearings, main structural frames

43
Q

Cobalt alloys

A

Stator of first stage of the HP turbine

44
Q

Titanium alloys

A

Fan, LP compressor, front stage of HP compressor

45
Q

Nickel alloys

A

HP compressor, combustion section, HP/LP turbines

M15 - Retake (1 decks)

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