COMPRESSORS, GAS TURBINES AND JET ENGINES QUIZ

Maximum temperature in a gas turbine is of the order of

1500°C

700°C

1000°C

2000°C

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A closed cycle gas turbine consists of a

All of these

Compressor

Cooling chamber

Heating chamber

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Stalling of blades in axial flow compressor is the phenomenon of

Air stream blocking the passage

Unsteady periodic and reversed flow

Air stream not able to follow the blade contour

Motion of air at sonic velocity

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In jet engines, for the efficient production of large power, fuel is burnt in an atmosphere of

Vacuum

Oxygen alone

Compressed air

Atmospheric air

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Gas turbine cycle with regenerator

Increases thermal efficiency

Allows operation at very high altitudes

Allows high compression ratio

Decreases heat loss is exhaust

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Propulsion efficiency of the following order is obtained in practice

0.5

0.34

0.6

0.72

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Reheating in a multistage expansion gas turbine ________ compressor work.

Increases

Decreases

Has no effect on

None of these

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If the flow of air through the compressor is parallel to its axis, then the compressor is

Turbo compressor

Axial flow compressor

Reciprocating compressor

Centrifugal compressor

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High air-fuel ratio is used in gas turbines

To increase the output

To increase the efficiency

To reduce the exit temperature

To save fuel

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The indicated work per unit mass of air delivered is

Directly proportional to clearance volume

Inversely proportional to clearance volume

Not affected by clearance volume

Greatly affected by clearance volume

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