M15.1

Question 1

What is energy

Answer 1

Something that gives us the capacity to perform work

Question 2

2 types of energy

Answer 2

Potential and kinetic

Question 3

Calculation for potential energy

Answer 3

PE = mgh

Question 4

Calculation for kinetic energy

Answer 4

KE = 1/2 x m x v2

Question 5

What is Newton’s first law

Answer 5

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

Question 6

What is newtons 2nd law

Answer 6

Force = ma

Question 7

What is newtons 3rd law

Answer 7

Law of action and reaction

Question 8

What is Brayton cycle

Answer 8

Thermodynamic cycle of a GTE that produce thrust

Question 9

4 stages of brayton cycle

Answer 9

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

Question 10

What is a GTE

Answer 10

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

Question 11

What are thermal processes called and what are they cause by

Answer 11

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

Question 12

What are thermal processes called

Answer 12

Changes of state

Question 13

What are the 4 changes of state

Answer 13

Isobaric, isochoric, isothermal and isentropic

Isobaric and isentropic are most important

Question 14

How are changes of state represented

Answer 14

Pressure- volume diagram (PV)

Question 15

What is force measured in

Answer 15

Lb or N

1lb = 4.448N

Question 16

What is work

Answer 16

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

Question 17

Calculation for work

Answer 17

Work = force x distance

1J = 1Nm

Question 18

What is power

Answer 18

How long is takes to accomplish work

Question 19

Calculation for power

Answer 19

Power = work/time

1W = 1Nm/s

Question 20

What is motion

Answer 20

Continuing change of position/place

Question 21

What is speed

Answer 21

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

Question 22

What is velocity

Answer 22

Vector quantity that describes speed and direction of object

Question 23

What is acceleration

Answer 23

Rate of change of velocity

Question 24

Calculation for acceleration

Answer 24

Change in velocity/time = m/s2

Question 25

What is the main function of engine

Answer 25

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

Question 26

What are the types of gas turbine engine

Answer 26

Turbojet, turbofan, turboprop and turboshaft

Question 27

What is a turbojet engine

Answer 27

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

Question 28

What is turbofan

Answer 28

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

Question 29

What is turboprop

Answer 29

Produce shaft horsepower only to drive a propeller

Question 30

What is turboshaft

Answer 30

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

Question 31

What happens with reciprocating engine compared to GTE

Answer 31

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

Question 32

What is cold section

Answer 32

Part of engine from inlet to compressor

Question 33

What is hot section

Answer 33

Combustion to exhaust

Question 34

What is hot section

Answer 34

Combustion to exhaust