Turbine Engine Part 2

Question 1

The process of combustion will result in an -

Answer 1

increase in temperature

Question 2

the first considerable drop in speed occurs in the -

Answer 2

divergent flow of the diffuser

Question 3

The beginning of the increase in velocity occurs in the -

Answer 3

combustion chamber

Question 4

A flat-rated turbofan engine has a constant maximum rated thrust level:

Answer 4

Up to a specific OAT

Question 5

Flat-rated jet engines are designed to provide constant maximum take-off thrust up to a certain level of:

Answer 5

ambient temperature

Question 6

EPR measures the ratio of -

Answer 6

jet pipe pressure to compressor inlet pressure

Question 7

EPR stands for -

Answer 7

engine pressure ratio

Question 8

The location of the measured EGT is?

Answer 8

the turbine discharge stage

Question 9

Temperature probes for the fuel system is located in the -

Answer 9

low pressure fuel lines

Question 10

Turbine engine oil systems make use of what type of pump?

Answer 10

gear type

Question 11

Oil coolers makes use of cold -

Answer 11

fuel from the tip of the tanks

Question 12

About a twin-spool compressor:

Answer 12

The low pressure spools runs at a lower RPM than the high pressure spool

Question 13

Which of the following statements regarding variable inlet guide vanes (VIGV’s) and variable stator vanes (VSV’s) on a high-bypass engine is correct?

Answer 13

VIGV’s are located in the front of the HP compressor and, together with the VSV’s control compressor airflow

Question 14

The function of a vibrator in some gas turbine ignition systems is to provide:

Answer 14

A DC current to the transformer to facilitate the generation of a higher voltage to the igniters

Question 15

In addition to providing ‘customer’ bleed for aeroplane systems, air may be bled from compressors of a turbofan engine to increase stall margin:

Answer 15

At low rotor speed

Question 16

The rotor blades of an axial compressor of a gas turbine engine are often mounted on a disk or drum using a ‘loose fit’, as this:

Answer 16

Limits damage to the blades due to vibration

Question 17

The take-off of a jet aeroplane may be performed with ‘reduced thrust’ in order to:

Answer 17

Reduce maintenance costs

Question 18

A fuel flow transmitter is usually mounted in the fuel line between -

Answer 18

the fuel control unit and the fuel manifold.

Question 19

Refer to Annex 021-4008. In flight, with the centre tank empty and APU operating, a fuel imbalance is detected (quantity in left main tank is less than in the right main tank). Rebalancing of the two tanks is:

Answer 19

Possible with cross-feed valves ‘OPEN’ and left main tank pumps ‘OFF’ and right main tank pumps ‘ON’.

Question 20

Fuel flow information for gas turbine engines is:

Answer 20

Measured in the line between the fuel control unit and the engine burners

Question 21

The fan in a high bypass ratio turbo-jet engine produces:

Answer 21

the greater part of the thrust.

Question 22

Labyrinth seals in the lubrication system of a gas turbine engine are designed to provide a seal that is:

Answer 22

Not completely tight, allowing some movement between rotating and static parts

Question 23

The air inlet duct is design to supply the engine with adequate air at the highest possible -

Answer 23

pressure

Question 24

Which of these statements about an impulse turbine are correct or incorrect? 1. The pressure remains constant across the nozzle guide vanes. 2. The pressure remains constant across the rotor blades.

Answer 24

1 is incorrect; 2 is correct

Question 25

The effect of ram air on the operation of a gas turbine engine is:

Answer 25

An increase in the efficiency of the engine

Question 26

The compressor surge effect during acceleration is prevented by the :

Answer 26

Fuel Control Unit (F.C.U.).

Question 27

The most important oil system instrument indication during gas turbine engine start is:

Answer 27

Oil pressure