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

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 W_R = Work input to the refrigerator 

According to the first law of thermodynamics:

W_R = Q₂ – Q₁

Q₂ = W_R + Q₁

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

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