Refrigeration MCQ

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Vertical lines on pressure-enthalpy chart show constant

A vapour absorption refrigerator uses _________ as a refrigerant.

Which of the following statement is correct for ammonia as a refrigerant?

When the lower temperature of a refrigerating machine is fixed, then the coefficient of performance can be improved by?

The evaporator changes the low-pressure liquid refrigerant from the expansion valve into

The coefficient of performance is the ratio of the refrigerant effect to the

In the refrigerator, liquid receiver is required between the condenser and flow-controlling device, if the quantity of refrigerant for the system is

Pressure of water vapour is given by

For infinite parallel planes with emissivities ε1 and ε2, the interchange factor for radiation from surface 1 to surface 2 is given by

A one tonne refrigerating machine means that

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