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A refrigerator whose coefficient of perf...

A refrigerator whose coefficient of performance `eta'` is 4, extracts heat from the cooling compartment at the rate of 400 J per cycle.
(a) How much work per cycle is required to operate the refrigerator cycle?
(b) How much heat per cycle is discharged to the room which acts as the high temperature reservoir?

Text Solution

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(a) `eta'=(Q_2)/(W)implies4=(400)/(W)impliesW=100J`
(b) `W=Q_1-Q_2impliesQ_1=Q_3+W=400+100=500J`
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CP SINGH-LAWS OF THERMODYNAMICS-EXERCISE
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  2. The first law of thermodynamics incorporates are concept (i) conserv...

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  3. The work done in the process AB is

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  4. (i) DeltaW(AB)=5P0V0 (ii) DeltaW(BC)=0 (iii) DeltaW(CA)=-2P0V0 (...

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  5. Consider the process on a system shown in figure. During the process, ...

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  6. Consider two processes on a system as shown in figure. The volumes in...

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  7. A system can be taken from the initial state p(1),V(1) to the final st...

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  8. In the figure given two processes A and B are shown by which a thermod...

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  9. Refer to figure in previous question, DeltaU(1) and DeltaU(2) be the c...

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  10. Refer to figure DeltaU(1) and DeltaU(2) be the changes in internal ene...

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  11. In a given process on an ideal gas, dW=0 and dQlt0. Then for the gas

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  12. Consider the following two statements. (A) If heat is added to a syst...

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  13. In a process on a system, the initial pressure and volume are equal to...

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  14. The pressure p and volume V of an ideal gas both increase in a process...

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  15. The state of a thermodynamic system is represented by

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  16. Which of the following is not a thermodynamical function

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  17. If Q, E and W denote respectively the heat added, change in internal e...

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  18. For free expansion of the gas, which of the following is true?

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  19. A system is given 300 calories of heat and it does 600 joules of work....

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  20. In thermodynamic process, pressure of a fixed mass of a gas is changes...

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  21. A perfect gas goes from a state A to another state B by absorbing 8 × ...

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