First slide

Heat Engine; Carnot Engine and refrigerator

Question

A heat engine has an efficiency $η .$ Temperature of source and sink are each decreased by 50k, then the efficiency of the engine

Moderate

A

Increases
B

Decreases
C

Remains constant
D

Becomes 1

Solution

$η = 1 - \frac{T_{2}}{T_{1}} - - - - (1) η' = 1 - \frac{T_{2} - 50}{T_{1} - 50} - - - - (2) f r o m (1) a n d (2) w e g e t η' > η$

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