Home
Class 11
PHYSICS
A refrigerator is maintained (stabilizer...

A refrigerator is maintained (stabilizer kept inside) at `9^(@)C`. If room temperature is `36^(@)C`, calculate the coefficient of performance.

Text Solution

Verified by Experts

Temperature inside the refrigerator,
`T_(1) = 9^(@)C = (273 + 9)K = 282 K`
Room temperature,
`T_(2) = 36^(@)C = (273 + 36) K = 309 K`
The coefficient of performance of a Carnot refrigerator is
`p = (T_1)/(T_(2) - T_(1)) = (282)/(309 - 282) = 282/27 = 10.44`.
This value corresponds to an ideal Carnot refrigerator. All refrigerators in practical use have lower value of p.
Promotional Banner

Topper's Solved these Questions

  • FIRST AND SECOND LAW OF THERMODYNAMICS

    CHHAYA PUBLICATION|Exercise Examination Archive with solution (NEET)|7 Videos

  • EXPANSION OF SOLIDS AND LIQUIDS

    CHHAYA PUBLICATION|Exercise CBSE SCANNER|2 Videos

  • FRICTION

    CHHAYA PUBLICATION|Exercise CBSE SCANNER|7 Videos

Similar Questions

Explore conceptually related problems

The temperature of the ice-box of a refrigerator is -7^(@)C and the room temperature is 31^(@)C . To maintain the temperature of the ice-box, the refrigerator approximates a Carnot refrigerator, what is its power consumption?

A heating element using nichrome connected to a 230 V supply draws an initial current of 3.2A which settles after a few seconds to a steady value of 2.8A. What is the stready temperature of the heating element if the room temperature is 27^@C ? Temperature coefficient of resistance of nichrome averages over the temperature range involved is 1.70times10^(-4^@)C^-1 .

1 g water has a volume of 1 cm^(3) at 4^(@)C . Its volume at 60^(@)C is 1.0169cm^(3) . Calculate the average coefficient of real expansion of water between these two temperatures.

A heating element using nichrome connected to a 230V supply draws an inital current of 3.2A which settles after a few seconds to a steady value of 2.8A. What is the steady temperature of the heating eleipent if the room temperature is 27.0^@C ? Temperature coefficient of resistivity of nichrome averaged over the temperature range involved is 1.70xx l0^(-4)//C^@ .

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

A copper ball of mass 100 g is at a temperature T. it is dropped in a copper calorimeter of mass 100 g, filled with 170 g of water at room temperature. Subsequently, the temperature of the system is found to be 75^(@) C. T is given by (given: room temperature = 30^(@) C , specific heat of copper = 0.1 cal/g " "^(@)C )

The coefficient of volume expansion of a liquid is gamma and its density at 0^(@)C is rho . If the temperature is increased to t^(@)C then the change in density will be

CHHAYA PUBLICATION-FIRST AND SECOND LAW OF THERMODYNAMICS-CBSE SCANNER
  1. Write the second law of thermodynamics.

    Text Solution

    |

  2. Define 1st law of thermodynamics. By using this law, derive relationsh...

    Text Solution

    |

  3. Give any one difference between a refrigerator and a heat engine.

    Text Solution

    |

  4. Write the expansion for coefficient of performance of a refrigerator i...

    Text Solution

    |

  5. What type of thermodynamic process is associated with sudden bursting ...

    Text Solution

    |

  6. Define isochoric process. What is the work done in such process?

    Text Solution

    |

  7. The molar specific heat capacity at constant volume of a mono atomic g...

    Text Solution

    |

  8. Prove C(p) - C(v) = R

    Text Solution

    |

  9. Give two points on comparison between isothermal and adiabatic process...

    Text Solution

    |

  10. What are the limitations of first law of thermodynamics? How are these...

    Text Solution

    |

  11. A refrigerator is maintained (stabilizer kept inside) at 9^(@)C. If ro...

    Text Solution

    |

  12. Using first law of thermodynamics derive the relation between specific...

    Text Solution

    |

  13. State the type thermodynamic process when (i) temperature is constant.

    Text Solution

    |

  14. State the type thermodynamic process when (ii) volume is constant.

    Text Solution

    |

  15. Define the coefficient of performance of a refrigerator.

    Text Solution

    |

  16. What is heat engine? Explain the principle and working of a heat engin...

    Text Solution

    |

  17. An ideal gas is compressed at a constant temperature, will its interna...

    Text Solution

    |

  18. Explain the two specific heats of a gas? Show that the difference betw...

    Text Solution

    |