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 the 4 changes of state

Answer 12

Isobaric, isochoric, isothermal and isentropic

Isobaric and isentropic are most important

Question 13

How are changes of state represented

Answer 13

Pressure- volume diagram (PV)

Question 14

What is force measured in

Answer 14

Lb or N

1lb = 4.448N

Question 15

What is work

Answer 15

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

Question 16

Calculation for work

Answer 16

Work = force x distance

Question 17

What is power

Answer 17

How long is takes to accomplish work

Question 18

Calculation for power

Answer 18

Power = work/time

Question 19

What is motion

Answer 19

Continuing change of position/place

Question 20

What is speed

Answer 20

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

Question 21

What is velocity

Answer 21

Vector quantity that describes speed and direction of object

Question 22

What is acceleration

Answer 22

Rate of change of velocity

Question 23

Calculation for acceleration

Answer 23

Change in velocity/time = m/s2

Question 24

What is the main function of engine

Answer 24

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

Question 25

What are the types of gas turbine engine

Answer 25

Turbojet, turbofan, turboprop and turboshaft

Question 26

What is a turbojet engine

Answer 26

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

Question 27

What is turbofan

Answer 27

Most common, high speed, efficient, 80% thrust, large fan at the front, twin/three spool Inefficient at higher altitudes

Question 28

What is turboprop

Answer 28

Produce shaft horsepower only to drive a propeller, compromise between good speed n efficiency Most efficient between 250-400 knots and 18,000-30,000ft

Question 29

What is turboshaft

Answer 29

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

Question 30

What happens with reciprocating engine compared to GTE

Answer 30

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 31

What is cold section

Answer 31

Part of engine from inlet to compressor

Question 32

What is hot section

Answer 32

Combustion to exhaust

Question 33

Calculation of force

Answer 33

F = ma

Question 34

What is force

Answer 34

Intensity of a thrust or input. Has to be applied for work,power and torque to exist

Question 35

1J =

Answer 35

1Nm

Question 36

What is another name for the Brayton cycle

Answer 36

Constant pressure or continous combustion cycle

Question 37

What is the SI unit for power

Answer 37

Watt and kilowatt. Horsepower is old

Question 38

1W =

Answer 38

1Nm/s

Question 39

What happens in intake and compressor

Answer 39

Increased pressure, decreased volume

Question 40

What happens in combustion chamber

Answer 40

Burning fuel which expands air by heat, pressure is constant, volume increases

Question 41

Where is highest static pressure

Answer 41

Inlet of combustion chamber

Question 42

Where is highest temp

Answer 42

Rear of combustion chamber