LODI AND SAYYID DYNASTY QUIZ

Mining industry usually employs following motive power

Petrol engine

Compressed air

Diesel engine

C. electric motor

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YOUR ANSWER : ?

The maximum delivery pressure in a rotary air compressor is

10 bar

30 bar

50 bar

20 bar

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The efficiency and work ratio of a gas turbine plant can be increased by

Reheating the air after partial expansion in the turbine

All of these

Injecting water in/around combustion chamber

Adding heat exchanger

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Pick up wrong statement. Surging phenomenon in centrifugal compressor depends on

Stagnation pressure at the outlet

Pressure ratio

Mass flow rate

Change in load

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

Lower volumetric efficiency

Better mechanical balance

Less power requirement

Less loss of air due to leakage past the cylinder

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In a double acting compressor, the air is compressed

In two cylinders on both sides of the piston

In one cylinder

In two cylinders

In a single cylinder on both sides of the piston

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An air receiver is to be placed outside. Should it be placed in

Enclosed room

Sun

Rain

Shade

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During peak load periods, the best method of controlling compressors is

Start-stop motor

Relief valve

Variable speed

Constant speed unloader

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A rocket engine uses __________ for the combustion of its fuel.

Compressed atmospheric air

None of these

Its own oxygen

Surrounding air

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For minimum work in multistage compression, assuming same index of compression in all stages

Work done in all stages should be equal

Work done in first stage should be more

Work done in subsequent stages should increase

Work done in subsequent stages should decrease

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