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The clearance ratio for a single stage compressor lies between

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RRB JE ME CBT 2 Previous Paper 1: Held on 29 Aug 2019
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  1. 15% and 20%
  2. 1% and 2%
  3. 20% and 30%
  4. 4% and 10%

Answer (Detailed Solution Below)

Option 4 : 4% and 10%
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Detailed Solution

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Explanation

Clearance Volume – The clearance volume is the space left in the cylinder when the piston riches the top dead center.

The clearance volume is provided

  • To avoid the piston striking the cylinder head.
  • As the valves are located in clearance volume, it allows the valve to operate safely.
  • A compressor should have the smallest possible clearance volume, because the compressed air left in the clearance volume, first re-expands in the cylinder during suction stroke, thus reducing the suction capacity.

Clearance ratio/Percentage Clearance

  • It is the ratio of clearance volume to the swept volume.
  • For the single-stage compressor, it may vary from 2 to 10%.

Effects of clearance volume

  • The volume of air taken is less, thus the volumetric efficiency decreases.
  • More power input is required to drive the compressor for the same pressure ratio.
  • The maximum compression pressure is controlled by clearance volume.

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