15.5, 15.6, 15.11

Question 1

3 types of airflow in a combustion chamber

Answer 1

Primary ( mixes with gas)
Secondary
Tertiary ( cools )

Question 2

Purpose of snout

Answer 2

Slows airflow within combuster

Question 3

Purpose of interconnectors

Answer 3

Ensures combustion is spread to all cans

Question 4

Reverse flow combustion chamber

Answer 4

Used on turbo prop and some business jet engines

Flow enters from the rear

Question 5

Function of turbine

Answer 5

Transform kinetic and heat energy into mechanical work

Question 6

2 types of turbine

Answer 6

Axial flow , radial flow

Question 7

Purpose of turbine nozzle guide vanes

Answer 7

Direct gasses from combuster onto turbine and turbine blades

Question 8

3 types of turbine blades

Answer 8

Reaction , impulse , impulse reaction

Question 9

Difference in convection and film cooling

Answer 9

Convection involves compressor discharge air

Question 10

3 creep phases

Answer 10

Primary
Secondary
Tertiary ( worst )

Question 11

Material of turbine blades

Answer 11

Super alloys , nickel based alloys

Question 12

Single crystal blade

Answer 12

Modern type of aircraft blade construction , has good resistance to fatigue and cracking

Question 13

Purpose of tip sealing

Answer 13

Stop air leaking over blade tip which will reduce efficiency

Question 14

Material of turbine blades

Answer 14

Nimonic alloys , nickel based alloys

Question 15

FADEC

Answer 15

full authority digital engine control

Uses sensors to monitor engine condition

Question 16

2 types of atomising fuel nozzles

Answer 16

Simplex , duplex

Question 17

What can sudden deceleration of an engine cause

Answer 17

Engine flame out

Question 18

Purpose of FCU ( fuel control unit )

Answer 18

Deliver correct amount of fuel

Question 19

EEC

Answer 19

Electronic engine control

Question 20

2 fuel pumps

Answer 20

Plunger type ( variable delivery )
Spur gear type ( constant delivery)

Question 21

2 types of fuel nozzles

Answer 21

Pressure atomising nozzle

Vaporising nozzle

Question 22

P and D valve?

Answer 22

Pressurising and dump

Valve