Mechanical Engineering MCQs

Page No. 184

As the value of index ‘«’ is decreased, the volumetric efficiency will___________________?


aincrease

✖


bdecrease

✓


cremain unaffected

✖


dmay increase/decrease depending on compressor clearance

✖


View Answer decrease

The advantage of multistage compression over single stage compression is ________________?


alower power consumption per unit of air delivered

✖


bhigher volumetric efficiency

✖


cdecreased discharge temperature

✖


dall of the above

✓


View Answer all of the above

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


aN.T.P. conditions

✖


bintake temperature and pressure conditions

✓


c0°C and 1 kg/cm2

✖


d20°C and 1 kg/cm2

✖



The volumetric efficiency of a compressor falls roughly as follows for every 100 m increase in elevation___________________?


a0.1%

✖


b0.5%

✖


c1.0%

✓


d5%

✖


View Answer 1.0%

During base load operation, the best method of controlling compressor is ___________________?


astart-stop motor

✓


bconstant speed unloader

✖


crelief valve

✖


dvariable speed

✖


View Answer start-stop motor

The volumetirc efficiency of a compressor is calculated on the basis of __________________?


avolume of air inhaled at working conditions

✖


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

✓


cvolume at 0°C and 1 kg/cm2

✖


dvolume at 20°C and 1 kg/cm2

✖



For slow-speed large capacity compressor, following type of valve will be best suited________________?


apoppet valve

✖


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

✖


cdisc or feather type

✓


dany of the above

✖


View Answer disc or feather type

The compressor efficiecny is the__________________?


aisothermal H.P/indicated H.R

✓


bisothermal H.P./shaft H.R

✖


ctotal output/air input

✖


dcompression work/motor input

✖



For a compressor, least work will be done if the compression is________________ ?


aisentropic

✖


bisothermal

✓


cpolytropic

✖


dsomewhere in between isentropic and isothermal

✖


View Answer isothermal

To avoid moisture troubles, the branch connections from compressed air lines should be taken from_________________?


atop side of main

✓


bbottom side of main

✖


cleft side of main

✖


dright side of main

✖


View Answer top side of main

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