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An ideal refrigerator is used to transfe...

An ideal refrigerator is used to transfer heat from a freezer at `-23^@C` to the surrounding at `27^@C`. Its coefficient of performance is

A

2.5

B

5

C

7.5

D

10

Text Solution

Verified by Experts

The correct Answer is:
B
`eta'=(1)/((T_1)/(T_2)-1)=(1)/(((273+27))/((273-23))-1)`
`=(1)/((300)/(250)-1)=(1)/((6)/(5)-1)=5`
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CP SINGH-LAWS OF THERMODYNAMICS-EXERCISE
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  4. "Heat cannot by itself flow from a body at lower temperature to a body...

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  5. A carnot cycle has the reversible process in the following order:

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  6. Choose the incorrect statement from the following: S1: The efficienc...

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  7. An ideal gas is subjected to cyclic process involving four thermodynam...

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  8. Helium gas goes through a cycle ABCDA (consisting of two isochoric and...

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  9. The maximum possible efficiency of an engine that aborbs hat at 327^@...

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  10. The efficiency of a carnot engine is (1)/(6). If the temperature of th...

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  11. Efficiency of a Carnot engine is 50% when temperature of outlet is 500...

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  12. An ideal refrigerator has a freezer at a temperature of -13^(@)C. The ...

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  13. An ideal refrigerator is used to transfer heat from a freezer at -23^@...

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  14. In a refrigerator, heat from inside at 277K is transferred to a room a...

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  15. If the door of a refrigerator is kept open, then which of the followin...

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  16. A Carnot engine, having an efficiency of eta=1//10 as heat engine, is ...

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  17. Which of the following statements is correct for any thermodynamic sys...

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  18. A mearsure of the degree of disorder of a system is known as

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  19. The change in the entropy of a 1 mole of an ideal gas which went throu...

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  20. If heat Q is added reversibly to a system at temperature T and heat Q'...

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