Fundamentals

Question 1

What is “g”?

Answer 1

Acceleration due to gravity

Question 2

Which law is Newton’s law of inertia?

Answer 2

1st

Question 3

What are the two forms of mechanical energy?

Answer 3

Potential energy

Kinetic energy

Question 4

What is the unit and equation for kinetic energy?

Answer 4

Joules (J)

E=1/2mv^2

Question 5

What is the working fluid of the gas turbine engine?

Answer 5

Air

Question 6

What is heating at constant pressure called?

Answer 6

Isobaric heating

Question 7

Which is the most fuel efficient engine at low altitude?

Answer 7

Turboprop

Question 8

What is always required on a turboprop?

Answer 8

Reduction gearbox

Question 9

What produces the most thrust on a turbo fan?

Answer 9

The fan

Question 10

Turbofan engines are normally of what configuration?

Answer 10

Double or triple spool.

Question 11

What type of construction are modern engines?

Answer 11

Turbofan

Question 12

What types of engines were developed from the turbojet engine?

Answer 12

Turbofan

Turboprop

Question 13

What qualities should engine materials have?

Answer 13

Light
Cheap
Strong enough for its task

Question 14

What are the turbine blades made from?

Answer 14

Titanium

Question 15

What is Newton’s 3rd law and what is it known as?

Answer 15

Every action has an equal and opposite reaction.

Law of action and reaction

Question 16

What is Newton’s first law of motion?

Answer 16

An object is at rest or constant motion unless the forces acting upon it become unbalanced.

Question 17

What is the unit and equation for force?

Answer 17

Newtons (N)

F=ma

Question 18

What is the unit and equation for work?

Answer 18

Joules (J)

Work= force x distance

Question 19

What is the unit and equation for power?

Answer 19

Watts (W)

Power= work/time

Question 20

What is the unit and equation for potential energy?

Answer 20

Joules (J)

E=mgh

Question 21

What does an engine provide for the aircraft?

Answer 21

Thrust
Hydraulics
Electrics
Pneumatics

Question 22

What is the Brayton cycle for a gas turbine engine?

Answer 22

Compression
Combustion
Exhaust

Question 23

What is the difference between the Brayton cycle and a reciprocating engine?

Answer 23

The Brayton cycle is happening all at once in a continuous motion and run of the engine, while the piston engine has to complete each stage individually.

Question 24

How does a turboprop generate thrust?

Answer 24

Small acceleration of a large quantity of air.

Question 25

How does a turbo-jet produce thrust?

Answer 25

High acceleration of a small quantity of air

Question 26

How does the turbofan generate thrust?

Answer 26

Fan- small acceleration of a large quantity of air.
Core engine- high acceleration of a small quantity of air
The two then combine at the exhaust to create the overall thrust.

Question 27

What is the bypass ratio?

Answer 27

The amount of air that bypasses the combustion chamber.

Question 28

What are the major engine modules?

Answer 28

Fan
Core
Accessory drive
Low pressure turbine

Question 29

What parts of the engine are made of aluminium?

Answer 29

Fan case
Gearbox
Fan exit case

Question 30

What is the fan module made of?

Answer 30

Aluminium

Question 31

Where are ceramics used on the engine?

Answer 31

Combustor

High pressure turbine

Question 32

What is the drive shaft and bearings made of?

Answer 32

Steel

Question 33

What is the only part made of cobalt?

Answer 33

Turbine nozzle

Question 34

What is the advantage of titanium and where it is fitted?

Answer 34

It has the same strength as steel at half the weight.

It is fitted in the fan, HP compressor, and LP compressor.

Question 35

Which type of engine generates the most thrust?

Answer 35

Turbofan