The coefficient of performance of a refrigerator is 5. If the temperature inside freezer is -20^o C, th temperature of the surroundings to which it rejects heat is

31^o C

41^o C

11^o C

21^o C

Solution

31^o C

COfficient of performance (β) of a refrigerator is defined as the ratio of the quantity of heat removed per cycle to the work done on the substance per cycle to remove this heat.
Given, coefficient of performance of a refrigerator, β = 5
Temperature of surface i.e., inside freezer,
T₂ = - 20^o C = - 20 +273 = 253 K
The temperature of surrounding i.e heat rejected outside T₁ =?
So, $straight beta space equals space fraction numerator straight T subscript 2 over denominator straight T subscript 1 minus straight T subscript 2 end fraction rightwards double arrow space 5 space equals space fraction numerator 253 over denominator straight T subscript 1 space minus space 253 end fraction rightwards double arrow space 5 space straight T subscript 1 space equals space 1265 space equals space 253 rightwards double arrow space 5 space straight T subscript 1 space equals space 1518 straight T subscript 1 space equals space 1518 over 5 space equals space 303.6 space straight K straight T subscript 1 space equals space 303.6 space minus 273 space equals space 31 to the power of straight o space straight C$

Some More Questions From Mechanical Properties of Fluids Chapter

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Mechanical Properties Of Fluids

The coefficient of performance of a refrigerator is 5. If the temperature inside freezer is -20^o C, th temperature of the surroundings to which it rejects heat is

31^o C

41^o C

11^o C

21^o C

Some More Questions From Mechanical Properties of Fluids Chapter

What determines the natural frequency of an oscillator?

Is there any relation between uniform circular motion and simple harmonic motion?

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Write down the expression for the instantaneous velocity and acceleration of particle vibrating in simple harmonic motion.

How do you define the mean position of particle executing simple harmonic motion?

Define amplitude.

What is the net displacement of the particle executing simple harmonic motion in one complete oscillation?

Are all the periodic motions simple harmonic?

Does the time period of particle vibrating in simple harmonic motion depend upon its displacement?

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Mechanical Properties Of Fluids

The coefficient of performance of a refrigerator is 5. If the temperature inside freezer is -20o C, th temperature of the surroundings to which it rejects heat is 31o C 41o C 11o C 21o C

Some More Questions From Mechanical Properties of Fluids Chapter

What determines the natural frequency of an oscillator?

Is there any relation between uniform circular motion and simple harmonic motion?

What is periodic motion?

Write down the expression for the instantaneous velocity and acceleration of particle vibrating in simple harmonic motion.

How do you define the mean position of particle executing simple harmonic motion?

Define amplitude.

What is the net displacement of the particle executing simple harmonic motion in one complete oscillation?

Are all the periodic motions simple harmonic?

Does the time period of particle vibrating in simple harmonic motion depend upon its displacement?

Mock Test Series

NCERT Sample Papers

Entrance Exams Preparation

The coefficient of performance of a refrigerator is 5. If the temperature inside freezer is -20^o C, th temperature of the surroundings to which it rejects heat is

31^o C

41^o C

11^o C

21^o C