Refrigeration and Air Conditioning One tonne of refrigeration (1TR) means that the heat removing capacity is 420 kJ/min 21 kJ/min 620 kJ/min 210 kJ/min 420 kJ/min 21 kJ/min 620 kJ/min 210 kJ/min 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.)P = ( ( ( O.P)R O.P.)R + 2 O.P.)R + 1 O.P)P = ( ( ( O.P)P = ( O.P)R - 1 O.P.)P = ( O.P.)P = ( ( ( O.P)R O.P.)R + 2 O.P.)R + 1 O.P)P = ( ( ( O.P)P = ( O.P)R - 1 O.P.)P = ( ANSWER DOWNLOAD EXAMIANS APP
Refrigeration and Air Conditioning For proper refrigeration in a cabinet, if the temperature and vapour pressure difference between cabinet and atmosphere is high, then Refrigerant with lower evaporation temperature should be used Smaller cabinet should be used Bigger cabinet should be used Perfectly tight vapour seal should be used Refrigerant with lower evaporation temperature should be used Smaller cabinet should be used Bigger cabinet should be used Perfectly tight vapour seal should be used 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) 50 kJ/kg 125 kJ/kg 100 kJ/kg 25 kJ/kg 50 kJ/kg 125 kJ/kg 100 kJ/kg 25 kJ/kg ANSWER DOWNLOAD EXAMIANS APP
Refrigeration and Air Conditioning The reciprocating refrigerant compressors are very suitable for Small displacements and low condensing pressures Small displacements and high condensing pressures Large displacements and low condensing pressures Large displacements and high condensing pressures Small displacements and low condensing pressures Small displacements and high condensing pressures Large displacements and low condensing pressures Large displacements and high condensing pressures ANSWER DOWNLOAD EXAMIANS APP
Refrigeration and Air Conditioning In a pressure enthalpy chart, the space to the left of the saturated liquid line represents Superheated vapour region Sub-cooled liquid region None of the listed here Wet vapour region Superheated vapour region Sub-cooled liquid region None of the listed here Wet vapour region ANSWER DOWNLOAD EXAMIANS APP
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