231) The wet bulb temperature during sensible cooling of air

remains constant

increases

decreases

none of these

Answer is:

decreases

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232) In absorption vapour systems, the refrigerant widely used is R-12.

Correct

Incorrect

Answer is:

Incorrect

233) Hydrogen is used in electrolux refrigeration system so as to __________ the rate of evaporation of the liquid ammonia passing through the evaporator.

equalise

reduce

increase

none of these

Answer is:

increase

234) A condenser of refrigeration system rejects heat at the rate of 120 kW, while its compressor consumes a power of 30 kW. The coefficient of performance of the system will be

1/4

1/3

Answer is:

4

Explanation:

The coefficient of performance or COP (sometimes CP or COP) of a heat pump, refrigerator or air conditioning system is a ratio of useful heating or cooling provided to work required.
COP=120 kw/30kw
COP=4

235) A refrigerant with the highest critical pressure is

R-11

R-12

R-22

Ammonia

Answer is:

Ammonia

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