Compressors Interview Questions And Answers

What is meant by a single-stage double-acting reciprocating compressor?

In a double-acting air compressor, the air is admitted alternatively to both sides of the piston. When one side is performing the suction stroke, the other side will be performing compression & delivery of compressed air. Theoretically, a double-acting compressor will deliver twice the amount of compressed air compared to a single-acting compressor of the same size and speed.

Define volumetric efficiency and clearance ratio

Volumetric efficiency:
Volumetric efficiency is defined as the ratio of the volume of free air sucked into the compressor per cycle to the stroke volume of the cylinder.

Clearance ratio:
Clearance ratio is defined as the ratio of clearance volume of swept volume (or) stroke volume.

What are the drawbacks of single-stage compression?

The size of the cylinder will be too large. Due to compression, there will be a rise in air temperature and it will be difficult to reject the heat in the little time available during compression. Sometimes the high temperature at the end of compression may heat the cylinder head or burn the lubricating oil.

Explain the flow of air controlled in reciprocating compressors

The flow of air is controlled by three methods such as
a. Centrifugal governor mechanisms
b. Maintaining the speed of motor constant
c. Providing air pocket advancement to the cylinder.

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