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Is the coefficient of performance of ref...

Is the coefficient of performance of refrigerator constant ?

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No, since the coefficient of performance of a refrigerator decreases with decreasing inside temperature of refrigerator.
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Why the coefficient of performance of refrigerator become infinity ?

If the coefficient of performance of a refrigerator is 5 and operates at the room temperature (27^@C) , find the temperature inside the refrigerator.

A refrigerator is to maintain eatables kept inside at 9^@ C. If room temperature is 36^@ C , calculate the coefficient of performance of refrigerator.

What is coefficient of performance of a refrigerator ?

Why the coefficient of performance of a refrigerator never be infinite ?

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

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?

Define and write the formula for coefficient of performance of a refrigerator.

KUMAR PRAKASHAN-THERMODYANMICS -Section-C (Objective Questions (VSQs))
  1. You feel enjoy by having bath in shower in summer but not in winter. W...

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  2. Write difference between CP-CV=R, CP-CV=R/J

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  3. Is the specific heat of water is greater than that of sand ?

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  4. What is the main difference between P to T diagram of water and CO2 ?

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  5. Give the limitations for first law of thermodynamics.

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  6. How many fixed points does a absolute Kelvin scale have ? Write their ...

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  7. Does the internal energy of an ideal gas change in an isothermal proce...

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  8. Does the internal energy of an ideal gas change in an adiabatic proces...

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  9. What conclusion be made from zeroth law of thermodynamics ?

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  10. Is the coefficient of performance of refrigerator constant ?

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  11. Is it possible to convert internal energy into work or mechanical ener...

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  12. Is the carnot engine working under an isothermal state doesn't do any ...

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  13. What is the efficiency of a carnot's engine working between boiling po...

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  14. What is the triple point ?

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  15. Why work is an extensive quantity ?

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  16. Can any system possess heat ?

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  17. Can any system possess thermal energy ?

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  18. Heat is not an object in a body. True or False ?

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  19. Correct the sentence : "System cannot posses mechanical energy but pos...

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  20. What is the net amount of heat entering the system in a cyclic process...

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