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Centrifugal compressor works on the principle of 
1. Conversion of pressure energy into KE
2. Conversion of kinetic energy into pressure
3. Centripetal action
4. Generating pressure directly

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Correct Answer - Option 2 : Conversion of kinetic energy into pressure

Explanation:

Centrifugal Compressor:

  • In these compressors, the required pressure rise takes place due to the continuous conversion of kinetic energy imparted to the gas by a high-speed impeller into static pressure.
  • It can work reasonably well in a contaminated atmosphere.
  • It is able to operate efficiently over a wide range of mass flow rate at any particular speed.
  • A pressure ratio of 5:1 may be obtained in a single-stage centrifugal compressor. By employing multi-stage staging (up to 8 stages) the delivery up to 400 atm. may be obtained.
  • multistage centrifugal compressor is used for high compression ratio so the width of blades reduces progressively in the direction of flow so as to get constant mass flow rate.
  • The isentropic efficiency of the centrifugal compressor is around 75%.
  • Centrifugal compressors accelerate the velocity of the gases (increases kinetic energy) which is then converted into pressure as the airflow leaves the volute and enters the discharge pipe.​

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