45) The water, alcohol and ammonia have same refrigerating effect at different altitudes.

46) The automobile radiator is a heat exchanger of

47) In mechanical refrigeration system, the refrigerant occurs as liquid between condenser and expansion valve.

48) A heat pump working on a reversed Carnot cycle has a C.O.P. of 5. It works as a refrigerator taking 1 kW of work input. The refrigerating effect will be

49) The curved lines on a psychrometric chart indicates