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In a mechanical refrigerator, the low te...

In a mechanical refrigerator, the low temperature coils are at a temperature of `-23^(@)` C and the compressed gas in the condenser has a temperature of ` 27^(@)C`. The theoretical coefficient of performance is :-

A

5

B

8

C

6

D

6.5

Text Solution

Verified by Experts

The correct Answer is:
A
`beta=(T_2)/(T_1-T_2)=(-23+273)/((27+273)-(-23+273))=(250)/(50)=5`
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Knowledge Check

  • In a refrigerator, the low temperature coil of evaporator is at -23^@C and the compressed gas in the condenser has a temperature of 77^@C . The amount of electrical energy spent in freezing 1 kg of water at 0^@C is

    A
    `134400 J`
    B
    `1344 J`
    C
    `80000 J`
    D
    `3200 J`

  • When a gas is compressed as constant temperature:

    A
    the speeds of the molecule increase
    B
    the collisions between the molecules increase
    C
    the speeds of the molecules decrease
    D
    the collisions between the molecule decrease

  • When a gas is compressed at constant temperature

    A
    the speeds of the molecules increase
    B
    the collisions between the molecules increase
    C
    the speeds of the molecules decrease
    D
    the collisions between the molecules decrease