First slide

Heat Engine; Carnot Engine and refrigerator

Question

According to second law of thermodynamics
a) All heat can be converted into work

b) The efficiency of a heat engine is always lesser than unity

c) It is not possible to transfer heat from lower to higher temperature by it self

Difficult

A

Both a and b are true
B

Both b and c are true
C

Both a and c are true
D

a, b, c are true

Solution

dQ=dU+dW
$η = 1 - \frac{T_{2}}{T_{1}} η < 1 s o m e e n e r g y i s c o n v e r t e d i n t h e f o r m o f h e a t, s o u n d, l i g h t e t c H e a t a l w a y s t r a n s f e r f r o m b o d y a t h i g h e r t e m p e r a t u r e t o b o d y a t l o w e r t e m p e r a t u r e$

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