318) The coefficient of performance of vapour compression refrigeration system is quite __________ as compared to air refrigeration system.

319) In order to collect liquid refrigerant and to prevent it from going to a __________ , a device known as accumulator is used at the suction of compressor.

320) Which of the following refrigerant has the lowest boiling point?

321) During sensible cooling of air, the relative humidity increases.

322) In actual air-conditioning applications for R-12 and R-22, and operating at a condenser temperature of 40 Degree Centigrade and an evaporator temperature of 5 Degree Centigrade, the heat rejection factor is about