Mechanical Engineering MCQs

Page No. 186

In multistage compressor, the isothermal compression is achieved by_________________?


aemploying intercooler

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bby constantly cooling the cylinder

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cby running compressor at very slow speed

✓


dby insulating the cylinder

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The capacity of compressor will be highest when its intake temperature is___________________?


alowest

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bhighest

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canything.

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datmospheric

✓


View Answer atmospheric

Reciprocating air compressor is best suited for___________________?


alarge quantity of air at high pressure

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bsmall quantity of air at high pressure

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csmall quantity of air at low pressure

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dlarge quantity of air at low pressure

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After-cooler is used to__________________?


acool the air

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bdecrease the delivery temperature for ease in handling

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ccause moisture and oil vapour to drop out

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dreduce volume

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Rotary compressor is best suited for_____________________?


alarge quantity of air at high pressure

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bsmall quantity of air at high pressure

✓


csmall quantity of air at low pressure

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dlarge quantity of air at low pressure

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Which is false statement about air receivers ___________________?


aThese are used to dampen pulsations ,

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bThese act as reservoir to- take care of sudden demands

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cThese increase compressor efficiency

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dThese knock out some oil and moisture

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The clearance volume of the air compressor is kept minimum because____________________?


ait allows maximum compression to be achieved

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bit greatly affects volumetric efficiency

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cit results in minimum work

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dit permits isothermal compression

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Ratio of indicated h.p. to shaft h.p. in known as__________________?


acompressor efficiency

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bisothermal efficiency

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cvolumetric efficiency

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dmechanical efficiency

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View Answer mechanical efficiency

Euler’s equation is applicable for__________________?


acentrifugal compressor

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baxial compressor

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cpumps

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dall of the above

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View Answer all of the above

Which is false statement about multistage compression ?


aPower consumption per unit of air delivered is low

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bVolumetric efficiency is high

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cIt is best suited for compression ratios around 7:1

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dThe moisture in air is condensed in the intercooler

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