Question

A Carnot engine receiving heat at 400 K has an effi-
ciency of 25%. The C.O.P. of a Carnot refrigerator
working between the same temperature limits is
(a) 1
(b) 2
(c) 3
(d) 4.​

Answer 1

Answer:

Given:−

T

2

=0

0

C=273K

T

1

=30

0

C=273+30=303K

Formula to be used:

β=T

2

/T

1

=273/303−273

=273/30

=9.1

∴ coefficient of performance (β) of a carnot refrigerator is 9.1

Hence,

option (C) is correct answer.