Thermodynamics - Result Question 38

40. A refrigerator works between 4C and 30C. It is required to remove 600 calories of heat every second in order to keep the temperature of the refrigerated space constant. The power required is:

(Take 1cal=4.2 joules)

[2016]

(a) 2.365W

(b) 23.65W

(c) 236.5W

(d) 2365W

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Answer:

Correct Answer: 40. (c)

Solution:

  1. (c) Given: T2=4C=4+273=277K

T1=30C=30+273=303K

β=Q2W=T2T1T2

β=600×4.2W=277303277

W=236.5 joule Power P=Wt=236.5 joule 1sec=236.5 watt.



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