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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