Refrigeration and Air Conditioning A reversible engine has ideal thermal efficiency of 30%. When it is used as a refrigerating machine with all other conditions unchanged, the coefficient of performance will be 2.33 4.33 3.33 1.33 2.33 4.33 3.33 1.33 ANSWER DOWNLOAD EXAMIANS APP
Refrigeration and Air Conditioning Which of the following is not a desirable property of a refrigerant? High risibility with oil Low boiling point Large latent heat Good electrical conductor High risibility with oil Low boiling point Large latent heat Good electrical conductor ANSWER DOWNLOAD EXAMIANS APP
Refrigeration and Air Conditioning Critical pressure of a liquid is the pressure Above which liquid becomes vapour Above which liquid becomes solid Above which liquid becomes gas Above which liquid will remain liquid Above which liquid becomes vapour Above which liquid becomes solid Above which liquid becomes gas Above which liquid will remain liquid ANSWER DOWNLOAD EXAMIANS APP
Refrigeration and Air Conditioning Allowable pressure on high pressure side or ammonia absorption system is of the order of 24 bars Atmospheric pressure Slightly above atmospheric pressure 56 bars 24 bars Atmospheric pressure Slightly above atmospheric pressure 56 bars ANSWER DOWNLOAD EXAMIANS APP
Refrigeration and Air Conditioning The temperature of air recorded by a thermometer, when its bulb is surrounded by a wet cloth exposed to the air, is called Wet bulb temperature Dry bulb temperature None of these Dew point temperature Wet bulb temperature Dry bulb temperature None of these Dew point temperature ANSWER DOWNLOAD EXAMIANS APP
Refrigeration and Air Conditioning On the pressure-enthalpy diagram, condensation and desuperheating is represented by a horizontal line because the process Takes place at constant entropy Takes place at constant temperature Involves no change in volume Takes place at constant pressure Takes place at constant entropy Takes place at constant temperature Involves no change in volume Takes place at constant pressure ANSWER DOWNLOAD EXAMIANS APP