Refrigeration and Air Conditioning The optimum effective temperature for human comfort is Higher in winter than in summer Same in winter and summer Not dependent on season Lower in winter than in summer Higher in winter than in summer Same in winter and summer Not dependent on season Lower in winter than in summer ANSWER DOWNLOAD EXAMIANS APP
Refrigeration and Air Conditioning The vapour compression refrigerator employs the following cycle Carnot Reversed Carnot Rankine Reversed Rankine Carnot Reversed Carnot Rankine Reversed Rankine ANSWER DOWNLOAD EXAMIANS APP
Refrigeration and Air Conditioning Under cooling in a refrigeration cycle Increases C.O.P Other factors decide C.O.P Decreases C.O.P O.P remains unaltered Increases C.O.P Other factors decide C.O.P Decreases C.O.P O.P remains unaltered 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) 25 kJ/kg 50 kJ/kg 125 kJ/kg 100 kJ/kg 25 kJ/kg 50 kJ/kg 125 kJ/kg 100 kJ/kg ANSWER DOWNLOAD EXAMIANS APP
Refrigeration and Air Conditioning A valve which maintains a constant degree of superheat at the end of the evaporator coil, is called Automatic expansion valve Low side float valve High side float valve Thermostatic expansion valve Automatic expansion valve Low side float valve High side float valve Thermostatic expansion valve ANSWER DOWNLOAD EXAMIANS APP
Refrigeration and Air Conditioning The bypass factor, in case of sensible cooling of air, is given by (where td₁ = Dry bulb temperature of air entering the cooling coil, td₂ = Dry bulb temperature of air leaving the cooling coil, and td₃ = Dry bulb temperature of the cooling coil) (td₁ -td₃)/( td₂ -td₃) (td₃ -td₂)/( td₁ -td₃) (td₂ -td₃)/( td₁ -td₃) (td₃ -td₁)/( td₂ -td₃) (td₁ -td₃)/( td₂ -td₃) (td₃ -td₂)/( td₁ -td₃) (td₂ -td₃)/( td₁ -td₃) (td₃ -td₁)/( td₂ -td₃) ANSWER DOWNLOAD EXAMIANS APP
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