COMPRESSORS, GAS TURBINES AND JET ENGINES QUIZ

The material commonly used for air craft gas turbine is

Timken, Haste alloys

Stainless steel

High alloy steel

Duralumin

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In a single acting reciprocating air compressor, without clearance, the compression of air may be

Isothermal

Isentropic

Polytropic

Any one of these

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Gas turbine works on

Ericsson cycle

Rankine cycle

Carnot cycle

Brayton or Atkinson cycle

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Volumetric efficiency of a compressor decreases with ________ in compression ratio.

Does not change

Increase

Remain same

Decrease

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The area of actual indicator diagram on an air compressor as compared to area of ideal indicator diagram is

More

Less

Same

More/less depending on compressor capacity

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Ratio of indicated h.p. to shaft h.p. in known as

Isothermal efficiency

Mechanical efficiency

Compressor efficiency

Volumetric efficiency

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Which is false statement about advantages of multistage compressor in comparison to single stage compressor?

Better mechanical balance

Less power requirement

Less loss of air due to leakage past the cylinder

Lower volumetric efficiency

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Phenomenon of choking in compressor means

Fixed mass flow rate regardless of pressure ratio

Reducing mass flow rate with increase in pressure ratio

No flow of air

Increased inclination of chord with air steam

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An after-cooler is used to

Cause moisture and oil vapour to drop out

Cool the air

Remove impurities from air

Reduce volume of air

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

More

Less

Zero

Same

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