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ME Set-1
Compressors Gas dynamics and Gas Turbines
109

Compressors Gas dynamics and Gas Turbines MCQ with Answers

109) The overall isothermal efficiency of the compressor is defined as the ratio of

work required to compress the air isothermally to the actual work required to compress the air for the same pressure ratio

isothermal power to the shaft power or B.P. of the motor or engine required to drive the compressor

volume of free air delivery per stroke to the swept volume of the piston

isentropic power to the power required to drive the compressor

Answer is:

isothermal power to the shaft power or B.P. of the motor or engine required to drive the compressor

Compressors Gas dynamics and Gas Turbines MCQ with Answers

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Related Compressors Gas dynamics and Gas Turbines MCQ with Answers

110) The minimum work required for a three stage reciprocating air compressor is __________ the work required for each stage.

equal to

double

three times

six times

Answer is:

three times

111) For a multi-stage compressor, the polytropic efficiency is constant throughout for all the stages.

Right

Wrong

Answer is:

Right

112) In a high pressure compressor, the delivery pressure is

1 to 5 bar

5 to 8 bar

8 to 10 bar

10 to 15 bar

Answer is:

8 to 10 bar

113) When the outlet angle from the rotor of a centrifugal compressor is more than 90 Degree, then the blades are said to be

forward curved

backward curved

radial

none of these

Answer is:

forward curved

Compressors Gas dynamics and Gas Turbines MCQ with Answers

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