Is cofficient of performance of refrigerator always constant?

Is the coefficient of performance of refrigerator constant ?

ExpIain coefficient of performance of a refrigerator.

Define coefficient of performance of a refrigerator.

What is coefficient of performance of a refrigerator ?

What is co-efficient of performance of a refrigerator ?

Why the coefficient of performance of refrigerator become infinity ?

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

What is co-efficient of performance of a refrigerator ? Obtain mathematical expression for it.