Refrigeration and Air Conditioning The refrigerant used in small tonnage commercial machines (hermetically sealed units) is Carbon dioxide Ammonia Sulphur dioxide R-12 Carbon dioxide Ammonia Sulphur dioxide R-12 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.)R + 2 ( ( O.P)R - 1 ( O.P.)R + 1 O.P)R O.P.)P = ( O.P)P = ( O.P)P = ( O.P.)P = ( ( O.P.)R + 2 ( ( O.P)R - 1 ( O.P.)R + 1 O.P)R O.P.)P = ( O.P)P = ( O.P)P = ( O.P.)P = ( ANSWER DOWNLOAD EXAMIANS APP
Refrigeration and Air Conditioning If a gas is to be liquefied, its temperature must be Equal to critical temperature Reduced to a value below its critical temperature Increased to a value above its critical temperature None of these Equal to critical temperature Reduced to a value below its critical temperature Increased to a value above its critical temperature None of these ANSWER DOWNLOAD EXAMIANS APP
Refrigeration and Air Conditioning Critical temperature is the temperature above which A gas will never liquefy A gas will immediately liquefy Water will evaporate Water will never evaporate A gas will never liquefy A gas will immediately liquefy Water will evaporate Water will never evaporate ANSWER DOWNLOAD EXAMIANS APP
Refrigeration and Air Conditioning During adiabatic saturation process on unsaturated air ___ remains constant. Dew point temperature Dry bulb temperature Relative humidity Wet bulb temperature Dew point temperature Dry bulb temperature Relative humidity Wet bulb temperature ANSWER DOWNLOAD EXAMIANS APP
Refrigeration and Air Conditioning The bypass factor (B. P. F.) in case of sensible heating of air is (Where td₁ = Dry bulb temperature of air entering the heating coil, td₂ = Dry bulb temperature of air leaving the heating coil, and td₃ = Dry bulb temperature of heating coil) (td₃ - td₁)/(td₂ - td₃) (td₃ - td₁)/(td₃ - td₂) (td₂ - td₃)/(td₃ - td₁) (td₃ - td₂)/(td₃ - td₁) (td₃ - td₁)/(td₂ - td₃) (td₃ - td₁)/(td₃ - td₂) (td₂ - td₃)/(td₃ - td₁) (td₃ - td₂)/(td₃ - td₁) ANSWER DOWNLOAD EXAMIANS APP
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