Mechanical Engineering Questions And Answers :: Compressors: part1

Mechanical Engineering : Compressors QUESTIONS AND ANSWERS :: part1 : 16 to 20

Following Mechanical Engineering Multiple choice objective type questions and answers will help you in BSNL JTO, GATE 2021 and IES 2021 examinations :

16.An ideal air compressor cycle without clearance on p-v diagram can be represented by following processes

one adiabatic, two isobaric, and one constant volume
two adiabatic and two isobaric
two adiabatic, one isobaric and one constant volume
one adiabatic, one isobaric and two constant volume
two isobaric, two adiabatic and one constant volume.

17.Isothermal compression efficiency, even when running at high speed, can be approached by using

multi-stage compression
cold water spray
both (a) and (b) above
fully insulating the cylinder
high stroke.

18.Isothermal compression efficiency can be attained by running the compressor

at very high speed
at very slow speed
at average speed
at zero speed

19.The pressure and temperature conditions of air at the suction of compressor are

slightly more than atmospheric
slightly less than atmospheric
pressure slightly more than atmospheric and temperature slightly less than atmospheric
pressure sightly less than atmospheric and temperature slightly more than atmospheric.

20.Isothermal compression though most efficient, but is not -practicable because

it requires very big cylinder
it does not increase pressure much
it is impossible in practice
compressor has to run at very slow speed to achieve it
it requires cylinder to be placed in water.

More Compressors QUESTIONS AND ANSWERS available in next pages

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