In a refrigerating machine, heat rejected is ________________ heat absorbed.

By Mohit Uniyal|Updated : June 29th, 2022

In a refrigerating machine, heat rejected is _____________ heat absorbed.

  1. Equal to
  2. Less than
  3. Greater than
  4. None of these

Answer: C

In a refrigerating machine, heat rejected is greater than heat absorbed.

Solution:

A refrigerator is a reversed heat engine that cools or maintains a body's temperature (T1) below the ambient temperature.

Let Q1 = Heat extracted from the cold body

      Q2 = Heat rejected to hot body

and WR = Work input to the refrigerator 

According to the first law of thermodynamics:

WR = Q2 - Q1

Q2 = WR + Q1

From the above expression, it is clear that in a refrigerating machine, heat rejected is greater than heat absorbed.

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