Air Compressor - Air Compressor objective questions and answers


11. The ratio of indicated HP to shaft HP is known as.......


   A.Compressor efficiency

   B.Isothermal efficiency

   C.Volumetric efficiency

   D.Mechanical efficiency


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D.Mechanical efficiency

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12. Volumetric efficiency is.......


   A.The ratio of stroke volume to clearance volume

   B.The ratio of the air actually delivered to the amount of piston displacement

   C.Reciprocal of compression ratio

   D.Index of compressor performance


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B.The ratio of the air actually delivered to the amount of piston displacement

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13. Volumetric efficiency of air compressors is of the order of.........


   A.20 to 30%

   B.40 to 50%

   C.60 to 70%

   C.70 to 90%


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D.70 to 90%

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14. The pressure of air at the beginning of the compression stroke is......atmospheric pressure


   A.Equal to

   B.Less than

   C.More than

   D.None of the above


✔ View Answer


B.Less than

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15. The intercooling in multistage compressors is done.......


   A.To cool the air during compression

   B.To cool the air at delivery

   C.To enable compression in two stages

   D.To minimise the work of compression


✔ View Answer


D.To minimise the work of compression

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