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___________ is a device by which a system is made to undergo a cyclic process that results in conversion of heat to work.

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SSC Scientific Assistant Physics Official Paper (Held On: 25 November 2017 Shift 2)
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  1. Refrigerator
  2. Heat engine
  3. Heat pump
  4. Heat Sink

Answer (Detailed Solution Below)

Option 2 : Heat engine
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SSC Scientific Assistant Physics Official Paper (Held On: 22 November 2017 Shift 1)
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CONCEPT: 

Heat engine:

HE: Heat Engine

TH: Temperature of Source / Hot reservoir and TL: Temperature of Sink / Cold Reservoir

Q1: Heat absorbed from Source and Q2: Heat rejected to Sink

W: Work Done

  • The efficiency(η) of a heat engine is defined as:

Now, W = Q1  - Q2 

EXPLANATION:

  • A refrigerator or heat pump is basically a heat engine that runs in the reverse direction. Therefore 1 and 3 are incorrect.
  • A heat engine is a device that converts heat into work continuously through a cyclic process. Therefore 2 is correct.

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