GAS TURBINE THRUST – Air – DGCA Question Bank For Politics

#1. EPR is a

Ratio between ambient pressure and exhaust pressure.

Ratio between ambient pressure and fan pressure.

Ratio between intake pressure and compressor delivery pressure.

Ratio between exhaust pressure and intake pressure.

#2. In a high by pass engine whose fan max rpm is 20000rpm, when turning at 5000rpm will develop approx.

25% take off thrust.

50% take off thrust

5% take off thrust

15% take off thrust.

#3. With an increase in altitude which of the following statements are correct for a jet aircraft with constant engine speed for a fixed throttle setting? 1. Temperature and pressure reduce with a resulting drop in thrust. 2. Fuel consumption will increase. 3. Fuel consumption will decrease. 4. Specific fuel consumption will increase. 5. Specific fuel consumption will decrease. 6. Specific fuel consumption stays relatively the same 7. Temperature and pressure will reduce, resulting in an increase in thrust.

1, 3, 6.

2, 4, 1.

7, 2, 4.

1, 2, 5

#4. The maximum thrust that a jet engine can develop will be:

Take off thrust.

Go around thrust.

Max climb thrust.

Max Static Thrust.

#5. As temperature ___air density and the mass of air for given engine speed therefore thrust _. To maintain the compressor speed however _ fuel must be added or the compressor will _______.

decreases decreases increases increases less slow down

increases decreases decreases increases more slow down

decreases increases increases increases more slow down

increases decreases increases decreases less speed up

#6. From a standing start with an increase in forward speed jet thrust will:

Increase.

Stay the same.

Decrease.

Decrease then recover but will never achieve its initial setting.

#7. On a turboprop aircraft with a 14 stage axial flow compressor while climbing it will experience:

Increase shaft horse-power increase jet thrust increase fuel consumption

Decrease shaft horse-power decrease jet thrust decrease fuel consumption

Decrease shaft horse-power increase jet thrust decrease fuel consumption

Decrease shaft horse-power decrease jet thrust increase fuel consumption

#8. On a turboprop aircraft with a 14 stage axial flow compressor while increasing forward speed, it will experience:

Increase shaft horse-power increase jet thrust

Decrease shaft horse-power decrease jet thrust

Decrease shaft horse-power increase jet thrust

Increase shaft horse-power decrease jet thrust

#9. On a part throttled engine, take off thrust would be achieved:

Later than normal due to pressure in the compressor being low.

Later than normal due to the EPR being low.

Earlier than normal.

Later than normal due to the EPR being high.

#10. In a gas turbine engine:

Ram pressure is maximum at the start of the take off run.

Ram pressure is unaffected by airspeed.

Thrust is unaffected by the aircraft’s forward speed.

Thrust is maximum and ram pressure at minimum at the start of the take off run.

Dgca Question Bank For Pilots

Results