Basic Gas Turbine

Question 0

You would expect to find the highest gas pressure in a turbojet engine:

Answer 0

In the diffuser

Question 1

The purpose of a diffuser in a Gas Turbine Engine is to:

Answer 1

Raise pressure and lower velocity

Question 2

The effect of an increase in altitude alone will have on the low pressure compressor of a gas turbine engine if constant thrust is maintained is -

Answer 2

Rpm will increase

Question 3

Subsonic gas flow decreases in velocity and increases in pressure when flowing through a -

Answer 3

Divergent duct

Question 4

In passing through the turbine section of a pure turbojet engine, what occurs to:
Gas pressure
Velocity
Temperature

Answer 4

Gas pressure reduces
Velocity increases
Temperature decreases

Question 5

For a give rpm, thrust output from a gas turbine engine will be greatest -

Answer 5

At MSL under ISA conditions

Question 6

Turbojet aircraft range increases as altitude increases toward the optimum FL because at high altitude:

Answer 6

The engine can operate at design rpm to maintain an efficient wing angle of attack

Question 7

The use of bleed air from a gas turbine engine compressor for anti-icing will result in

Answer 7

An increase in the gas temperature, reduced thrust and an increase in SFC

Question 8

Maximum gas pressure in a gas turbine engine is found where?

Answer 8

Between the final compressor stage and the inlet to the combustion chamber

Question 9

In a free turbine turboprop engine, the propellor is driven by:

Answer 9

Only the rear LP Turbines

Question 10

The action which should be taken is a gas turbine compressor begins to stall during engine acceleration on start up is:

Answer 10

Shut off the fuel supply and maintain starter motor rotation

Question 11

The times the surge bleed valve is open and closed during normal gas turbine engine operation are:

Answer 11

Open from idling to nearly design rpm, then closed up to max rpm

Question 12

A modest increase in speed in a slow flying jet aircraft leads to a small initial decrease in maximum thrust because:

Answer 12

The difference between the exhaust and I take velocities is reduced

Question 13

Pressure through the combustion chambers in a gas turbine engine:

Answer 13

Is constant or falls slightly

Question 14

When climbing in a jet engines aircraft, the engine parameter which would stay constant if the thrust lever setting remaining unchanged is:

Answer 14

RPM

Question 15

Thrust is produced in a jet engine by:

Answer 15

The force required to accelerate a mass of air through the engine