COMPRESSORS, GAS TURBINES AND JET ENGINES QUIZ

For speed above 3000 km/hour, it is more advantageous to use

Propellers

Rockets

Turbojet engine

Ramjet engine

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In a centrifugal compressor, an increase in speed at a given pressure ratio causes

Decrease in flow

Increase in flow and decrease in efficiency

Increase in efficiency

Increase in flow

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For minimum work required to compress and deliver a quantity of air by multistage compression

The compression ratio in each stage should be same

All of the listed here

The intercooling should be perfect

The work-done in each stage should be same

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The ratio of the increase in pressure in rotor blades to total increase in pressure in the stage is called

Pressure ratio

Degree of reaction

Pressure coefficient

Slip factor

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Pick up the wrong statement about advantages of multistage compression

Better lubrication is possible advantages of multistage

Mechanical balance is better

Air can be cooled perfectly in between

More loss of air due to leakage past the cylinder

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The mean effective pressure of the compressor is the

None of these

Volume of air delivered by the compressor

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

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The propulsive power of the rocket is (where v₁ = Jet velocity, and v₂ = Aircraft velocity)

(v₁² -v₂²)/2g

(v₁² -v₂²)/g

(v₁ - v₂)²/g

(v₁ - v₂)²/2g

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Stalling of blades in axial flow compressor is the phenomenon of

Motion of air at sonic velocity

Air stream not able to follow the blade contour

Air stream blocking the passage

Unsteady periodic and reversed flow

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Work ratio of a gas turbine plant is ratio of

Work done by turbine and heat supplied

Work done by turbine and net work output

Net work output and heat supplied

Net work output and work done by turbine

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An after-cooler is used to

Reduce volume of air

Cool the air

Cause moisture and oil vapour to drop out

Remove impurities from air

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