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Working coefficient of refrigerator is...

Working coefficient of refrigerator is

A

`(Q_1)/(Q_1-Q_2)`

B

`(Q_2)/(Q_2-Q_1)`

C

`(Q_2)/(Q_1-Q_2)`

D

`(Q_1)/(Q_2-Q_1)`

Text Solution

Verified by Experts

The correct Answer is:
C
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Refrigerator is an apparatus which takes heat from a cold body, work is done on it and the work done together with the heat absorbed is rejected to the source. An ideal refrigerator can be regarded as Carnot's ideal heat engine working in the reverse direction. The coefficient of performance of refrigerator is defined as beta = ("Heat extracted from cold reservoir")/("work done on working substance") = (Q_(2))/(W) = (Q_(2))/(Q_(1)- Q_(2)) = (T_(2))/(T_(1) - T_(2)) A Carnot's refrigerator takes heat from water at 0^(@)C and discards it to a room temperature at 27^(@)C . 1 Kg of water at 0^(@)C is to be changed into ice at 0^(@)C. (L_(ice) = 80"kcal//kg") What is the work done by the refrigerator in this process ( 1 "cal" = 4.2 "joule" )

Refrigerator is an apparatus which takes heat from a cold body, work is done on it and the work done together with the heat absorbed is rejected to the source. An ideal refrigerator can be regarded as Carnot's ideal heat engine working in the reverse direction. The coefficient of performance of refrigerator is defined as beta = ("Heat extracted from cold reservoir")/("work done on working substance") = (Q_(2))/(W) = (Q_(2))/(Q_(1)- Q_(2)) = (T_(2))/(T_(1) - T_(2)) A Carnot's refrigerator takes heat from water at 0^(@)C and discards it to a room temperature at 27^(@)C . 1 Kg of water at 0^(@)C is to be changed into ice at 0^(@)C. (L_(ice) = 80"kcal//kg") How many calories of heat are discarded to the room?

TARGET PUBLICATION-KINETIC THEORY OF GASES AND RADIATION -Evaluation test
  1. Working coefficient of refrigerator is

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  2. The power radiated by a black body is P, and it radiates maximum energ...

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  3. One mole of an ideal gas is kept enclosed under a light piston (area =...

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  4. A metallic pipe with nut and bolt assembly is shown in the figure. as ...

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  5. Variation of heat of reaction with temperature is known as

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  6. A black pattern on a porcelain bowl appears brighter than the rest of ...

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  7. A boiler heats water flowing at the rate of 2.0 litres per minute from...

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  8. For an ideal gas,

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  9. A reversible engine converts one third input into work. When the tempe...

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  10. Two bodies A and B having same surface areas have emmissivities of 0.0...

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  11. Two different adiabatic curves for the same gas intersect two isotherm...

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  12. A given quantity of a ideal gas is at pressure P and absolute tempera...

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  13. A given quantity of a ideal gas is at pressure P and absolute tempera...

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  14. Real gases obey ideal gas laws more closely at

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  15. A flask is filled with 10 g of a gas at 20 °C and then heated to 50 °C...

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  16. One mole of an ideal gas at temperature T was cooled isochorically til...

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  17. Assertion: Equal volumes of monatomic and polyatomic gases are adiabat...

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  18. A certain mass of an ideal gas undergoes a reversible isothermal compr...

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  19. An ideal Black-body at room temperature is thrown into a furnace. It i...

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