Fundermentals

Question 1

Equation of Force

Answer 1

F=Mass x Acceleration

Question 2

Equation of Weight

Answer 2

W=Mass x Gravity

Question 3

What is work

Answer 3

Work is done when an object is moved over a distance

Question 4

Equation of Work

Answer 4

W=Force/Distance

Question 5

What is Power

Answer 5

The rate of doing work

Question 6

Equation of Power

Answer 6

P=Work/Time

Question 7

Unit of Force

Answer 7

Newton

Question 8

Unit of Weight

Answer 8

Newton

Question 9

Unit of Power

Answer 9

Watt

Question 10

Unit of Work

Answer 10

Joule

Question 11

Two Mechanical energy

Answer 11

Potential

Kinetic

Question 12

What is potential energy

Answer 12

The energy a body has by virtue of its position

Question 13

Equation of PE

Answer 13

PE=mgh

Question 14

What is kinetic energy

Answer 14

The energy a body has by virtue of its motion

Question 15

What is the equation of Kinetic energy

Answer 15

KE=1/2 x m x v^2

Question 16

Newton’s First Law

Answer 16

Body will remain at rest or at a constant velocity unless an external force acts on it

Question 17

Newton’s second law

Answer 17

The force on a mass causing it to accelerate is directly proportional to the force
F=ma

Question 18

Newton’s third law

Answer 18

Every action has an equal and opposite reaction

Question 19

The brayton cycle

Answer 19

The GTE is a heat engine using air as a working fluid to provide heat

Question 20

Intermittent / continuous

Answer 20

Piston eng = intermittent

Turbine eng = continuous

Question 21

Does pressure rise during combustion in a GTE eng

Answer 21

No, as it is not an I closed space

Question 22

Does volume increase or decrease in a piston eng

Answer 22

Increase

Question 23

Isobaric heating

Answer 23

There are no peak or fluctuating pressures

Question 24

High/low octane fuel

Answer 24

Piston eng = high octane fuel

GTE eng = lower octane fuel

Question 25

Turbo fan

Answer 25

Used on modern A/C high speeds, good efficiency

Question 26

Turbo jet

Answer 26

Older type of GTE, very high speeds, very loud, large fuel intake

Question 27

Turbo prop

Answer 27

Shaft power only, good speed for A/C size, good fuel efficiency

Question 28

APU

Answer 28

Supplies electrical and pneumatic power

Question 29

What is Jet propulsion

Answer 29

The propelling Force, which is generated in the opposite direction to the flow of mass Called a reaction engine

Question 30

How do we accelerate air

Answer 30

Increase pressure

Question 31

Thrust of a turbo jet

Answer 31

Produces thrust by accelerating ambient air, produce high velocity gasses Loud and not efficient

Question 32

Thrust of a turbo prop

Answer 32

Produces thrust by accelerating a large amount of air with a propeller, Prop is driven by the compressor or by a free turbine along a long centre drive shaft, Reduction gear box is required, Convert gas energy into torque, Very efficient, not high speed

Question 33

Thrust of a turbo fan

Answer 33

``` Usually twin or triple spool, Fan is driven by turbine, No reduction gearbox, Large amount of gas converted into torque to tribe fan and compressor, rest into thrust, Fan can produce 80% thrust ```

Question 34

Bypass ration on a turbo fan

Answer 34

4:1 - 9:1

Question 35

Prop fans

Answer 35

Number of fans and the shape allows the engines to have good speeds and alt capabilities 20% less fuel Bypass ratio = 90:1

Question 36

Non modular construction

Answer 36

Saves weight, complicated/difficult to access parts, older type

Question 37

Modular construction

Answer 37

Modern design, pre assembled/balanced, easier to work on, easy to remove parts

Question 38

Major modules of modular construction

Answer 38

Fan, core, accessory drive, LP turbine

Question 39

Eng materials characteristics

Answer 39

Strong, lightweight and cheap

Question 40

Al alloy

Answer 40

Gearbox housing, fan stator casings, fan module parts

Question 41

Ceramic

Answer 41

Combustor and HP turbine

Question 42

Steel alloys

Answer 42

N1 drive shaft, eng bearings, main structural frames

Question 43

Cobalt alloys

Answer 43

Stator of first stage of the HP turbine

Question 44

Titanium alloys

Answer 44

Fan, LP compressor, front stage of HP compressor

Question 45

Nickel alloys

Answer 45

HP compressor, combustion section, HP/LP turbines