Refrigeration and Air Conditioning Which of the following refrigerant has the lowest freezing point? Ammonia R-22 R-12 R-11 Ammonia R-22 R-12 R-11 ANSWER DOWNLOAD EXAMIANS APP
Refrigeration and Air Conditioning Nusselt number (NN) is given by NN = V²/t.cp NN = hl/k NN = μ cp/k NN = ρ V l /μ NN = V²/t.cp NN = hl/k NN = μ cp/k NN = ρ V l /μ ANSWER DOWNLOAD EXAMIANS APP
Refrigeration and Air Conditioning A thermostatic expansion valve in a refrigeration system Ensures the evaporator completely filled with refrigerant of the load Is suitable only for constant load systems Maintains different temperatures in evaporator in proportion to load None of these Ensures the evaporator completely filled with refrigerant of the load Is suitable only for constant load systems Maintains different temperatures in evaporator in proportion to load None of these ANSWER DOWNLOAD EXAMIANS APP
Refrigeration and Air Conditioning Dry bulb temperature is the temperature of air recorded by a thermometer, when The moisture present in it begins to condense It is not affected by the moisture present in the air None of the listed here Its bulb is surrounded by a wet cloth exposed to the air The moisture present in it begins to condense It is not affected by the moisture present in the air None of the listed here Its bulb is surrounded by a wet cloth exposed to the air ANSWER DOWNLOAD EXAMIANS APP
Refrigeration and Air Conditioning The condensing pressure due to the presence of non-condensable gases, as compared to that actually required for condensing temperatures without non-condensable gases, Will be higher Will be lower May be higher or lower depending upon the nature of non-condensable gases Will remain unaffected Will be higher Will be lower May be higher or lower depending upon the nature of non-condensable gases Will remain unaffected ANSWER DOWNLOAD EXAMIANS APP
Refrigeration and Air Conditioning The sensible heat factor during cooling and dehumidification process is given by (where h₁ = Enthalpy of air entering the cooling coil, h₂ = Enthalpy of air leaving the cooling coil, and hA = Enthalpy of air at the end of dehumidification process) (h2 - hA)/ (h1 - h2) (hA - h1)/ (h2 - h1) (h1 - h2)/ (hA - h2) (hA - h2)/ (h1 - h2) (h2 - hA)/ (h1 - h2) (hA - h1)/ (h2 - h1) (h1 - h2)/ (hA - h2) (hA - h2)/ (h1 - h2) ANSWER DOWNLOAD EXAMIANS APP
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