312) A furnace is made of a red brick wall of thickness 0.5 m and conductivity 0.7 W/mK. For the same heat loss and temperature drop, this can be replaced by a layer of diatomite earth of conductivity 0.14 W/mK and thickness

313) In a refrigeration system, the expansion device is connected between the

314) The heat rejection factor (HRF) is given by

315) Wein's law states that the wave length corresponding to __________ is proportional to the absolute temperature.

316) In a domestic vapour compression refrigerator, the refrigerant commonly used is