Air Compressor - Air Compressor objective questions and answers


46. During peak load periods,the best method of controlling compressors is.......


   A.Start-stop motor

   B.Constant speed unloader

   C.Relief valve

   D.Variable speed


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B.Constant speed unloader

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47. In a centrifugal compressor,an increase in speed at a given pressure ratio causes.......


   A.Increase in flow

   B.Decrease in flow

   C.Increase in efficiency

   D.Decrease in efficiency

   E.Increase in flow and decrease in efficiency


✔ View Answer


E.Increase in flow and decrease in efficiency

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48. The ratio of the volume of free air delivery per stroke to the swept volume of the piston,is known as.........


   A.Compressor efficiency

   B.Volumetric efficiency

   C.Isentropic efficiency

   C.Mechanical efficiency


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B.Volumetric efficiency

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49. The ratio of the indicated power to the shaft power or brake power of the motor or engine required to drive the compressor,is called......


   A.Compressor efficiency

   B.Volumetric efficiency

   C.Isentropic efficiency

   C.Mechanical efficiency


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D.Mechanical efficiency

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50. The volumetric efficiency of a compressor.......


   A.Increases with decrease in compression ratio

   B.Decreases with decrease in compression ratio

   C.Increases with increase in compression ratio

   D.Decrease with increase in compression ratio


✔ View Answer


D.Decrease with increase in compression ratio

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