21.
The optimum effective temperature for human comfort is

22.
An evaporator is also known as

23.
In a refrigeration cycle, the flow of refrigerant is controlled by

24.
Vapour compression refrigeration is somewhat like

25.
At lower temperatures and pressures, the latent heat of vaporisation of a refrigerant

26.
A refrigeration cycle operates between condenser temperature of +27°C and evaporator temperature of -23°C. The Carnot coefficient of performance of cycle will be

27.
The bypass factor (B.P.F.) in case of sensible heating of air is (Where td1 = Dry bulb temperature of air entering the heating coil, td2 = Dry bulb temperature of air leaving the heating coil and td3 = Dry bulb temperature of heating coil)

28.
The general rule for rating refrigeration systems (excepting for CO2 system) is to approximate following h.p. per ton of refrigeration

30.
The coefficient of performance (C.O.P.) of a refrigerator working as a heat pump is given by

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