55) For a compressor, least work will be done if the compression is

isentropic

isothermal

polytropic

somewhere in between isentropic and isothermal

Answer is:

isothermal

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56) In a compressor, free air delivered is the actual volume delivered at the stated pressure reduced to

N.T.P. conditions

intake temperature and pressure conditions

0°C and 1 kg/cm2

20°C and 1 kg/cm2

Answer is:

intake temperature and pressure conditions

Explanation:

Free air delivery is the actual volume delivered by a compressor when reduced to the normal temperature and pressure conditions. The capacity of a compressor is generally given in terms of free air delivery.

57) The volumetirc efficiency of a compressor is calculated on the basis of

volume of air inhaled at working conditions

volume of air inhaled at N.T.P. conditions

volume at 0°C and 1 kg/cm2

volume at 20°C and 1 kg/cm2

Answer is:

volume of air inhaled at N.T.P. conditions

58) The volumetric efficiency of a compressor falls roughly as follows for every 100 m increase in elevation

0.10%

0.50%

1.00%

Answer is:

0.01

59) For slow-speed large capacity compressor, following type of valve will be best suited

poppet valve

mechanical valve of the corliss, sleeve, rotary or semirotary type

disc or feather type

any of the above

Answer is:

disc or feather type

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