Mechanical Engineering MCQs

Page No. 188

Ratio of indicated H.P. and brake H.P. is known as_________________?


amechanical efficiency


bvolumetric efficiency


cisothermal efficiency


dadiabatic efficiency


View Answer mechanical efficiency

Aeroplanes employ following type of compressor_______________?


aradial flow


baxial flow


ccentrifugal


dcombination of above


View Answer axial flow

Compression efficiency is compared against_____________________?


aideal compression


badiabatic compression


cbotii isothermal and adiabatic compression


disothermal compression



An ideal air compressor cycle with clearance on p-v diagram can be represented by following processes_______________?


aone adiabatic, two isobaric, and one constant volume


btwo adiabatic and two isobaric


ctwo adiabatic, one isobaric and one constant volume,


done adiabatic, one isobaric and two constant volume



The work done per unit mass of air in compression will’be least when n is equal to______________?


a1


b1.2 ,


c1.3


d1.4


View Answer 1

An ideal air compressor cycle without clearance on p-v diagram can be represented by following processes________________?


aone adiabatic, two isobaric, and one constant volume


btwo adiabatic and two isobaric


ctwo adiabatic, one isobaric and one constant volume


done adiabatic, one isobaric and two constant volume



What will be the volume of air at 327°C if its volume at 27°C is 1.5 m3/mt ?


a3 m3/mt


b1.5 m3/mt


c18 m3/mt


d6 m3/mt


View Answer 3 m3/mt

Isothermal compression though most efficient, but is not -practicable because_________________?


aityrequires very big cylinder


bit does not increase pressure much


cit is impossible in practice


dcompressor has to run at very slow speed to achieve it



Inter cooling in compressors__________________?


acools the delivered air


bresults in saving of power in compressing a given volume to given pressure


cis the standard practice for big compressors


denables compression in two stages



The compressor capacity with decrease in suction temperature_________________?


aincreases


bdecreases


cremains unaffected


dmay increase or decrease depending on compressor capacity


View Answer increases

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