Fundementals

Question 1

What is acceleration due to gravity

Answer 1

9.8 m/s2

Question 2

Force formula

Answer 2

Mass x acceleration

Question 3

Weight formula

Answer 3

Mass x acceleration due to gravity

Question 4

Newton conversion

Answer 4

Kg x m/s2

Question 5

GTE Working cycle

Answer 5

1. Induction
2. Compression
3. Combustion
4. Exhaust

Question 6

Work done formula

Answer 6

Force x distance

SI Unit = Joules

Question 7

Power formula

Answer 7

Work / Time

SI Unit = Watts

Question 8

What are the 2 types of mechanical energy

Answer 8

Potential and kinetic

Question 9

What is potential energy

Answer 9

Energy a body has due to a virtue of position

Question 10

What is kinetic energy

Answer 10

Energy a body has by virtue of motion

Question 11

Newtons first law

Answer 11

Law of inertia

Question 12

Newton’s second law

Answer 12

Acceleration produced in a mass by a force acting on it directly proportional to the force and inversely proportional to the mass

Question 13

Newton’s third law

Answer 13

Every action has an opposite and equal reaction

Question 14

What is the brayton cycle

Answer 14

Working cycle of GTE

Question 15

What is a piston engine peak pressure

Answer 15

Excess of 1000psi

Question 16

Within the Brayton cycle what increases

Answer 16

Velocity of air & Pressure energy

Question 17

What happens during combustion in regards to volume and pressure

Answer 17

Pressure of air doesn’t rise during combustion however volume does

Question 18

What is isobaric heating

Answer 18

Heating at constant pressure

Question 19

What’s the difference between piston engine and GTE working cycle

Answer 19

Piston is intermittent whereas GTE is continuously

Question 20

How is energy converted back to kinetic energy

Answer 20

High velocity jet efflux

Question 21

What’s the function of aircraft engines

Answer 21

Creates necessary movement on aircraft which is thrust

Supplies hydraulic power , electric power , bleed air for pneumatic system

Question 22

2 types of engines

Answer 22

Piston engine and Gas Turbine

Question 23

Advantage of piston aircraft

Answer 23

More efficient

Question 24

Disadvantages of piston aircraft

Answer 24

Performance decreases as altitude increases

Too large for aircraft as ratio of weight to power decreases

Question 25

What is Jet Propulsion

Answer 25

Force to move aircraft forward

Question 26

How does a reaction engine work

Answer 26

Use newtons law of motion

Question 27

What’s needed to accelerate air

Answer 27

Pressure needs to be increased

Question 28

What are the 4 types of Gas Turbine

Answer 28

1. Turbojet 2. Turbofan 3. Turboprop 4. Auxiliary Power Unit

Question 29

What is bypass ratio

Answer 29

Air coming into fan duct vs air into core

Question 30

How can you identify a turbojet engine

Answer 30

No fan in front of

Question 31

How can you identify a Turbofan aircraft

Answer 31

Fan in front

Question 32

How can you identify a Turboprop aircraft

Answer 32

Propeller in front of

Question 33

When is a turbojet engine used

Answer 33

High speed aircraft

Question 34

Disadvantage with turbojet engine

Answer 34

Very loud and inefficient

Question 35

What is turbofan engine a combination with of

Answer 35

Combines advantages of turbojet & turboprop

Question 36

Turbofan engine is what kind of engine

Answer 36

Twin or triple spool

Question 37

What is total thrust in turbofan engines

Answer 37

Thrust developed by core engine + Fan

Question 38

Advantage and disadvantage of turboprop engines

Answer 38

Efficient but not at high speeds

Question 39

In a turbofan how much thrust does the fan produce

Answer 39

More then 80% of total thrust

Question 40

Turbofan bypass ratio

Answer 40

Between 4:1 & 9:1

Question 41

Aircraft engine bypass ratio

Answer 41

90:1

Question 42

Advantage of aircraft engine in terms of fuel

Answer 42

Use 20% less fuel then high bypass engines

Question 43

2 types of engine construction

Answer 43

Modular and non-modular

Question 44

What is modular construction

Answer 44

Engine can be separated into sub major modules

Question 45

What is non-modular construction

Answer 45

Weight saving construction but complicated to repair and difficult to access parts

Question 46

What’s aluminium alloy used for

Answer 46

Low loaded parts of fan module such as gearbox housing & fan stator castings

Question 47

Where is ceramic alloy used

Answer 47

Heat and corrosion protection such as combustor and HP turbine

Question 48

Where is steel alloy used

Answer 48

N1 drive shaft Engine bearings Main structural frames on engines Intermediate case & turbine exhaust

Question 49

Where is cobalt alloy used

Answer 49

High heat resistance when stator in first stage of high pressure turbine

Question 50

Where is Titanium alloy used

Answer 50

High centrifugal force areas such as LP compressor & front stage of HP compressor

Question 51

Where is nickel base alloy used

Answer 51

High centrifugal loads at high temperatures HP Compressor & combustion section for high and low pressure turbines