Refrigeration and Air Conditioning In case of sensible heating of air, the coil efficiency is given by (where B.P.F. = Bypass factor) 1/ B.P.F. 1 + B.P.F. 1 - B. P.F. P.F. - 1 1/ B.P.F. 1 + B.P.F. 1 - B. P.F. P.F. - 1 ANSWER DOWNLOAD EXAMIANS APP
Refrigeration and Air Conditioning A refrigerant with the highest critical pressure is Ammonia R-12 R-11 R-22 Ammonia R-12 R-11 R-22 ANSWER DOWNLOAD EXAMIANS APP
Refrigeration and Air Conditioning The undesirable property of a refrigerant is Non-explosive Non-flammable Non-toxic High boiling point Non-explosive Non-flammable Non-toxic High boiling point ANSWER DOWNLOAD EXAMIANS APP
Refrigeration and Air Conditioning In a vapour compression system, the condition of refrigerant before entering the expansion or throttle valve is Wet vapour Very wet vapour High pressure saturated liquid Dry vapour Wet vapour Very wet vapour High pressure saturated liquid Dry vapour ANSWER DOWNLOAD EXAMIANS APP
Refrigeration and Air Conditioning A refrigerating system operating on reversed Brayton refrigeration cycle is used for maintaining 250 K. If the temperature at the end of constant pressure cooling is 300 K and rise in the temperature of air in the refrigerator is 50 K, then the net work of compression will be (assume air as working substance with Cp = 1 kJ/kg) 100 kJ/kg 50 kJ/kg 125 kJ/kg 25 kJ/kg 100 kJ/kg 50 kJ/kg 125 kJ/kg 25 kJ/kg ANSWER DOWNLOAD EXAMIANS APP
Refrigeration and Air Conditioning At lower temperatures and pressures, the latent heat of vaporisation of a refrigerant increases decreases remains same depends on other factors increases decreases remains same depends on other factors ANSWER DOWNLOAD EXAMIANS APP
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