Air Compressor - Air Compressor objective questions and answers


26. The maximum delivery pressure in a rotary air compression is.......


   A.10 bar

   B.20 bar

   C.30 bar

   D.40 bar


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B.10 bar

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27. The speed of the rotary compressor is.......as compared to reciprocating air compressor


   A.High

   B.Low

   C.Equal

   D.None of the above


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A.High

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28. Intercooling in compressors.........


   A.Cool the delivered air

   B.Results in saving of power in compressing a given volume to given pressure

   C.Is the standard practice for big compressors

   C.Enable compression in two stages


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B.Results in saving of power in compressing a given volume to given pressure

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29. Adiabatic compression is one in which ......


   A.Temperature during compression remains constant

   B.No heat leaves or enters the compressor cylinder during compression

   C.Temperature rise follows a linear relationship

   D.Work done is maximum


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B.No heat leaves or enters the compressor cylinder during compression

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30. The overall isothermal efficiency of compressor is defined as the ratio of.......


   A.Isothermal HP to the bhp of motor

   B.Power to drive compressor to isothermal hp

   C.Work to compress air isothermal to work for actual compression


✔ View Answer


A.Isothermal HP to the bhp of motor

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