Question

A Carnot cycle refrigerator operates between 250 K and 300 K. Its coefficient of performance is
1) 6
2) 5
3) 1.2
4) 0.8

Answer 1

a Carnot cycle refrigerator operation between 250 k and k.its coefficient of performance is 5

Answer 2

answer : option (1) 6

explanation : use formula, $C.O.B=\frac{T_H}{T_H-T_C}$

where C.O.B denotes coefficient of performance, $T_H$ denotes temperature of hot reservoir and $T_C$ denotes cold reservoir.

given, $T_C=250K$

$T_H=300K$

so, C.O.B = 300/(300 - 250)

= 300/50

= 6

hence, option (1) is correct.