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Can the coefficient of performance of a ...

Can the coefficient of performance of a refrigerator be increased by increasing the mass of working substance ?

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No. Mass of substance is not present in the formula of the coefficient performance of refrigerator.
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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 coefficient of performance of the machine?

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?

KUMAR PRAKASHAN-THERMODYANMICS -Section-C (Objective Questions (VSQs))
  1. What is the specific heat of a gas in an a adiabatic process ?

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  2. Is the temperature of an isolated system of gas be changed ?

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  3. Can the coefficient of performance of a refrigerator be increased by i...

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  4. If the door of a refrigerator is kept open in a room, will it make the...

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  5. Give the nature of Pto V điagrams of isobaric and isochoric processes.

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  6. Write two essential characteristics of an ideal heat engine.

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  7. Under which ideal condition, the efficiency of a carnot engine become ...

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  8. In summer, when the valve of a bicycle tube is removed the escaping ai...

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  9. When air of the atmosphere rises up it cools. Why ?

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  10. Why does a gas get heated on compression ?

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  11. Can two isothermal curves intersect each other?

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  12. Is the rusting of iron be a reversible process ? Why ?

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  13. For all gases CP - CV constant, then all gases CP/CV hold constant ?

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  14. Which quantity remains constant in an adiabatic process ?

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  15. Is the specific heat of water and ice be the same? Give their values.

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  16. What is the total work done in a cyclic process ?

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  17. With what the internal energy of real gases be determined ?

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  18. Melting of ice is an adiabatic or an isothermal process ?

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  19. Can PV = RT be described with an isothermal or an adiabatic process ?

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  20. Give the main points of second law of thermodynamics.

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