ENGINEERING THERMODYNAMICS QUIZ

The maximum temperature in a gas turbine is

500°C

1000°C

700°C

200°C

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In the axial flow gas turbine, the work ratio is the ratio of

Actual compressor work and theoretical compressor work

Compressor work and turbine work

Actual total head temperature drop to the isentropic total head drop from total head inlet to static head outlet

Output and input

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Volumetric efficiency of a compressor without clearance volume

Increases with increase in compression ratio

Decreases with increase in compression ratio

Is not dependent upon compression ratio

May increase/decrease depending on compressor capacity

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The mean effective pressure of the compressor is the

Volume of air sucked by the compressor during its suction stroke

Actual volume of the air delivered by the compressor when reduced to normal temperature and pressure conditions

Volume of air delivered by the compressor

None of these

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The ratio of the discharge pressure to the inlet pressure of air is called

Compressor efficiency

Volumetric efficiency

Expansion ratio

Compression ratio

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In a jet propulsion unit, the products of combustion after passing through the gas turbine are discharged into

Vacuum

Discharge nozzle

Atmosphere

Back to the compressor

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The air entry velocity m a rocket as compared to aircraft is

Less

Same

Zero

More

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The most efficient method of compressing air is to compress it

Isothermally

Isentropically

Isochronically

Adiabatically

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After-cooler is used to

Reduce volume

Cool the air

Cause moisture and oil vapour to drop out

Decrease the delivery temperature for ease in handling

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The volumetric efficiency of a compressor falls roughly as follows for every 5°C increase in atmospheric temperature

0.01

0.05

0.005

0.001

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