Refrigeration and Air Conditioning One of the purposes of sub cooling the liquid refrigerant is to Reduce compressor discharge temperature Increase cooling effect Reduce compressor overheating Ensure that only liquid and not the vapour enters the expansion (throttling) valve Reduce compressor discharge temperature Increase cooling effect Reduce compressor overheating Ensure that only liquid and not the vapour enters the expansion (throttling) valve ANSWER DOWNLOAD EXAMIANS APP
Refrigeration and Air Conditioning The difference between dry bulb temperature and dew point temperature, is called Dew point depression Wet bulb depression Degree of saturation Dry bulb depression Dew point depression Wet bulb depression Degree of saturation Dry bulb depression ANSWER DOWNLOAD EXAMIANS APP
Refrigeration and Air Conditioning The vapour pressure of refrigerant should be Equal to atmospheric pressure Could be anything Lower than atmospheric pressure Higher than atmospheric pressure Equal to atmospheric pressure Could be anything Lower than atmospheric pressure Higher than atmospheric pressure ANSWER DOWNLOAD EXAMIANS APP
Refrigeration and Air Conditioning A good refrigerant should have High specific volume and high latent heat of vaporisation Low C.O.P. and low freezing point High latent heat of vaporisation and low freezing point High operating pressures and low freezing point High specific volume and high latent heat of vaporisation Low C.O.P. and low freezing point High latent heat of vaporisation and low freezing point High operating pressures and low freezing point ANSWER DOWNLOAD EXAMIANS APP
Refrigeration and Air Conditioning A certain refrigerating system has a normal operating suction pressure of 10 kg/cm gauge and condensing pressure of about 67 kg/cm. The refrigerant used is Freon Ammonia Brine Carbon dioxide Freon Ammonia Brine Carbon dioxide ANSWER DOWNLOAD EXAMIANS APP
Refrigeration and Air Conditioning The coefficient of performance (C.O.P.) of a refrigerator working as a heat pump is given by ( O.P)P = ( O.P)R ( O.P)R - 1 ( O.P.)P = ( O.P.)R + 2 O.P.)P = ( O.P)P = ( O.P.)R + 1 ( ( O.P)P = ( O.P)R ( O.P)R - 1 ( O.P.)P = ( O.P.)R + 2 O.P.)P = ( O.P)P = ( O.P.)R + 1 ( ANSWER DOWNLOAD EXAMIANS APP
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