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M15 mine > M15.1 > Flashcards

M15.1 Flashcards

1
Q

What is energy

A

Something that gives us the capacity to perform work

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2
Q

2 types of energy

A

Potential and kinetic

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3
Q

Calculation for potential energy

A

PE = mgh

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4
Q

Calculation for kinetic energy

A

KE = 1/2 x m x v2

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5
Q

What is Newton’s first law

A

Law of inertia, remains at rest/in motion unless acted upon by a force

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6
Q

What is newtons 2nd law

A

Force = ma

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7
Q

What is newtons 3rd law

A

Law of action and reaction

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8
Q

What is Brayton cycle

A

Thermodynamic cycle of a GTE that produce thrust

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9
Q

4 stages of brayton cycle

A

Intake (suck)
Compression (squeeze)
Expansion (bang)
Exhaust (bang)

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10
Q

What is a GTE

A

Gas turbine engine is a heat engine that uses air as a working fluid to provide thrust

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11
Q

What are thermal processes called and what are they cause by

A

Changes of state, caused by heat, cooling, expansion or compression

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12
Q

What are thermal processes called

A

Changes of state

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13
Q

What are the 4 changes of state

A

Isobaric, isochoric, isothermal and isentropic

Isobaric and isentropic are most important

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14
Q

How are changes of state represented

A

Pressure- volume diagram (PV)

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15
Q

What is force measured in

A

Lb or N

1lb = 4.448N

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16
Q

What is work

A

Done when a force is moved through a distance in direction of force. Measure of energy transferred.

17
Q

Calculation for work

A

Work = force x distance

1J = 1Nm

18
Q

What is power

A

How long is takes to accomplish work

19
Q

Calculation for power

A

Power = work/time

1W = 1Nm/s

20
Q

What is motion

A

Continuing change of position/place

21
Q

What is speed

A

How fast an object is moving or how fair it will travel in a specific time

22
Q

What is velocity

A

Vector quantity that describes speed and direction of object

23
Q

What is acceleration

A

Rate of change of velocity

24
Q

Calculation for acceleration

A

Change in velocity/time = m/s2

25
Q

What is the main function of engine

A

Provide necessary movements of ac and supply hydraulic and electrical power and bleed air

26
Q

What are the types of gas turbine engine

A

Turbojet, turbofan, turboprop and turboshaft

27
Q

What is a turbojet engine

A

First type, high speeds but very loud
Problems with noise and fuel consumption at 0.8 mach

28
Q

What is turbofan

A

Most common, high speed, efficient, 80% thrust, large fan at the front

29
Q

What is turboprop

A

Produce shaft horsepower only to drive a propeller

30
Q

What is turboshaft

A

Produces shaft power to drive machinery instead of thrust. Used in applications that require small, powerful, lightweight engine (APU)

31
Q

What happens with reciprocating engine compared to GTE

A

Reciprocating - intake, compression, combustion and exhaust all take place in combustion chamber
Whereas in GTE they all have separate sections to perform different functions

32
Q

What is cold section

A

Part of engine from inlet to compressor

33
Q

What is hot section

A

Combustion to exhaust

34
Q

What is hot section

A

Combustion to exhaust

M15 mine (2 decks)

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