Mechanical Engineering MCQs

Page No. 182

Axial flow compressor has the following advantage over centrifugal compressor__________________?


alarger air handling ability per unit frontal area

✓


bhigher pressure ratio per stage

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caerofoil blades are used

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dhigher average velocities

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Maximum delivery pressure is a rotary air compressor is of the order of__________________?


a6 kg/cm2

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b10 kg/cm2

✓


c16 kg/cm2

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d25 kg/cm2

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View Answer 10 kg/cm2

The thermodynamic efficiency of rotary compressor is based on_______________?


aisothermal compression

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badiabatic compression

✓


cisentropic compression

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dpolytropic compression

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View Answer adiabatic compression

Surging is the phenomenon of___________________?


aair stream blocking the passage

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bmotion of air at sonic velocity

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cunsteady, periodic and reversed flow

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dair stream not able to follow the blade contour

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The maximum compression ratio in an actual single stage axial flow comperssor is of the order of________________?


a1 : 1.2

✓


b1 : 2

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c1 : 5

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d1 : 10

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View Answer 1 : 1.2

The ratio of isentropic work to euler’s work is known as _____________________?


acompressor efficiency

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bisentropic efficiency

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cEuler’s efficiency

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dpressure coefficient

✓


View Answer pressure coefficient

The ratio of outlet whirl velocity to blade velocity in case of centrifugal compressor is called__________________?


aslip factor

✓


bvelocity factor

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cvelocity coefficient

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dblade effectiveness

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View Answer slip factor

More than one stage will be preferred for reciprocating compressor if the delivery pressure is more than____________________?


a2 kg/cm2

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b6 kg/cm2

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c10 kg/cm2

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d14.7 kg/cm2

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View Answer 2 kg/cm2

Pick up the wrong statement about advantages of multistage compression____________________?


abetter lubrication is possible advantages of multistage

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bmore loss of air due to leakage past the cylinder

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cmechanical balance is better

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dair can be cooled perfectly in between

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Losses in a centrifugal compressor are due to__________________?


ainlet losses

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bimpeller channel losses

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cdiffuser losses

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dall of the above

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View Answer all of the above

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