Mechanical Engineering MCQs

Page No. 187

Out of the following, from where you will prefer to take intake for air compressor_________________?


afrom an air conditioned room maintained at 20°C

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bfrom outside atmosphere at 1°C

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cfrom coal yard side

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dfrom a side where cooling tower is located nearby

✓



Volumetric efficiency of a compressor with clearance volume ________________?


aincreases with increase in compression ratio

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bdecreases with increase in compression ratio

✓


cin not dependent upon compression ratio

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dmay increase/decrease depending on compressor capacity

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Clearance volume in actual reciprocating compressors is essential __________________?


ato accommedate Valves in the cylinder head

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bto provide cushioning effect

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cto attain high volumetric efficiency

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dto provide cushioning effect and also to avoid mechanical bang of piston with cylinder head

✓



The net work input required for compressor with increase in clearance volume_____________________?


aincreases

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bdecreases

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cremains same

✓


dincreases/decreases depending on com-pressor capacity

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View Answer remains same

The ratio of work doen per cycle to the swept volume in case of compressor is called ______________?


acompression index

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bcompression ratio

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ccompressor efficiency

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dmean effective pressure

✓



Ratio of compression is the ratio of__________________?


agauge discharge pressure to the gauge intake pressure

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babsolute discharge pressure to the ab-solute intake pressure

✓


cpressures at discharge and suction cor-responding to same temperature

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dstroke volume and clearance volume

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Volumetric efficiency is_____________________?


athe ratio of stroke volume to clearance volume

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bthe ratio of the air actually delivered to the amount of piston displacement

✓


creciprocal of compression ratio

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dindex of compressor performance

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Volumetric efficiency of a compressor without clearance volume________________?


aincreases with increase in compression ratio

✖


bdecreases with increase in compression ratio

✖


cis not dependent upon compressin ratio

✓


dmay increase/decrease depending on compressor capacity

✖



Volumetric efficiency of air compressors is of the order of________________?


a20-30%

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b40-50%

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c60-70%

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d70-90%

✓


View Answer 70-90%

Cylinder clearance in a compressor should be _________________?


aas large as possible

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bas small as possible

✓


cabout 50% of swept volume

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dabout 100% of swept volume

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View Answer as small as possible

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