IG

Question 1

Theory of reciprocating engine

Answer 1

Suck squeeze bang blow
Closed and intermittent
Otto cycle

Question 2

Theory of GTE engine

Answer 2

Open and continous
Braytton cycle
Intake compression combustion exhaust

Question 3

2 types of energy

Answer 3

Potential

Kinetic

Question 4

Define potential energy

Answer 4

Enegery stored in an object due to thier form or position

Question 5

Define kinetic energy

Answer 5

Energy in a object with motion

Question 6

Outline conservation of energy

Answer 6

Energy can neither be created nor destroyed, it can only change forms

Question 7

Measurement of power

Answer 7

Joules

P=W/t

Question 8

Outline how heat effects matter

Answer 8

When matter is heated, the particles have more energy and move further apart

Question 9

3 gas laws

Answer 9

Charles law
Boyles law
General gas law

Question 10

Outline Charles law

Answer 10

Pressure constant.

When gas heated (temperature increase), volume increases

Question 11

Outline Boyles law

Answer 11

Temp remains constant

Pressure decreases and volume of container increases

Question 12

3 ways of heat transfer

Answer 12

Conduction -physical touch
Convection - fluid
Radiation - waves

Question 13

Types of GTE

Answer 13

Turbine fan
Turboshaft
Turboprop
Turbojet

Question 14

Factors effecting thrust

Answer 14

Temperature
Altitude
Airspeed
Engine speed
Fan efficiency

Question 15

Outline how temp effects thrust

Answer 15

Lower temp is more dense so more thrust can be produced

Question 16

Altitude effects thrust

Answer 16

When altitude increases thrust decreases (less dense)

Question 17

Airspeed effect thrust

Answer 17

Forward airspeed increases air mass acceleration in engine decreases which results in less thrust produced.
However
When forward airspeed increases more air is forced into engine. Known as ram effect and results in more pressure therefore more thrust produced

Question 18

Engine speed effect thrust

Answer 18

At high engine speed a small increase in rpm will equal large increase kn thrust.

While low engine speed with a large increase of speed equals small increase in thrust

Question 19

Fan efficiency effect thrust

Answer 19

Turbo fans can produce same thrust as turbojet but with less fuel required

Question 20

Function of inlet

Answer 20

Recover as much of the total pressure of the free airstream as possible and deliver it to the compressor

Question 21

Types of inlet [6]

Answer 21

Bellmouth
Subsonic
Supersonic
Fuselage mounted
Wing mounted
Engine mounted inlets

Question 22

Compressor damage

Answer 22

Erosion

FOD

Question 23

Purpose of compressor

Answer 23

To increase pressure of airnin engine. More air forced in the more thrust can be produced

Question 24

2 ways to prevent fod in compressor

Answer 24

Inlet screen,

Vortex dissipater

Question 25

Inlet warning

Answer 25

Magnesium thorium, use appropriate ppe when filings or dust are present. They are radio active and must not be injested

Question 26

Compressor purpose

Answer 26

A device that raises the pressure of a working fluid passing through it

Question 27

Compressore shape

Answer 27

Convergent. To raise velocity

Question 28

Cuase of compressor stall

Answer 28

AOA to great

Question 29

Highest pressure in an engine

Answer 29

Diffuser

Question 30

Exit guide vanes from a compressor

Answer 30

Straighten and smooth the airflow into the diffuser and prepare it for combustion

Question 31

5 bleed air from diffuser

Answer 31

``` Turbine cooling Bearing seal pressurisation Engine anti icing Customer services Pneumatic starting ```

Question 32

Outline Air for combustion

Answer 32

Primary air 25-35% used for combustion Secondary air used for shaping and cooling

Question 33

Best fuel to air ratio

Answer 33

15:1

Question 34

Turbine components

Answer 34

Case Stator Shroud Rotor

Question 35

Purpose of turbine

Answer 35

To extract sufficient kinetic energy from expanding gasses to drive the compressor and engine accessory gearbox

Question 36

Purpose shrouded turbine blades

Answer 36

Reduces vibration | Increases efficiency

Question 37

Where open ended turbine blades found

Answer 37

Higher rotational speed turbines

Question 38

Where shrouded turbine blades found

Answer 38

Used on slower rotational speed turbines

Question 39

2 types of turbine cooling

Answer 39

Convection/film | Transpiration - stationary blades only

Question 40

3 parts of exhaust section

Answer 40

Exhaust nozzle Tailpipe Exhaust cone

Question 41

Purpose of exhaust cone

Answer 41

Channel, collect and discharge gasses in a single jet

Question 42

Purpose of tail pipe

Answer 42

Directs exhaust gasses safely to exhaust nozzle

Question 43

Purpose of exhaust nozzle

Answer 43

Provide an extra boost in gas velocity, by its convergent shape

Question 44

What is compressor stall and when it occur

Answer 44

Inbalance between inlet velocity airflow and compressor rotational speed. Occurs when AoA on compressor blade is too great

Question 45

Safety precautions for working on fire systems

Answer 45

- Detectors must be clear of other components - Fire wire must not be crushed or damaged - Clip grommetsust not be crushed - Fire wire bend tolerances to be observed

Question 46

Purposes of compressor exit guide vanes

Answer 46

Last stage in compressor, and they remove the swirl from airflow prior to entering diffuser

Question 47

Why turbo prop more efficient at lower speed

Answer 47

Over 375mph aerodynamic drag and tip shock stall to great