Refrigeration and Air Conditioning When the lower temperature of a refrigerating machine is fixed, then the coefficient of performance can be improved by Operating the machine at higher speeds Operating the machine at lower speeds Raising the higher temperature Lowering the higher temperature Operating the machine at higher speeds Operating the machine at lower speeds Raising the higher temperature Lowering the higher temperature ANSWER DOWNLOAD EXAMIANS APP
Refrigeration and Air Conditioning In aircraft, air refrigeration Cycle is used because of Low temperature at high altitudes High heat transfer rate Low weight per tonne of refrigeration Higher coefficient of performance Low temperature at high altitudes High heat transfer rate Low weight per tonne of refrigeration Higher coefficient of performance ANSWER DOWNLOAD EXAMIANS APP
Refrigeration and Air Conditioning Mass flow ratio of NH₃ in comparison to Freon-12 for same refrigeration load and same temperature limits is of the order of 1: 3 1: 1 1: 9 9: 1 1: 3 1: 1 1: 9 9: 1 ANSWER DOWNLOAD EXAMIANS APP
Refrigeration and Air Conditioning In a bootstrap air evaporative cooling system, the evaporator is provided Between the first heat exchanger and the secondary compressor Between the combustion chamber and the first heat exchanger Between the second heat exchanger and the cooling turbine Between the secondary compressor and the second heat exchanger Between the first heat exchanger and the secondary compressor Between the combustion chamber and the first heat exchanger Between the second heat exchanger and the cooling turbine Between the secondary compressor and the second heat exchanger ANSWER DOWNLOAD EXAMIANS APP
Refrigeration and Air Conditioning The optimum effective temperature for human comfort is Same in winter and summer Higher in winter than in summer Lower in winter than in summer Not dependent on season Same in winter and summer Higher in winter than in summer Lower in winter than in summer Not dependent on season ANSWER DOWNLOAD EXAMIANS APP
Refrigeration and Air Conditioning The operating temperature of a cold storage is -2°C. The heat leakage from the surrounding is 30 kW for the ambient temperature of 40°C. The actual C.O.P. of refrigeration plant used is one fourth that of ideal plant working between the same temperatures. The power required to drive the plant is 7.44 kW 3.72 kW 18.6 kW 1.86 kW 7.44 kW 3.72 kW 18.6 kW 1.86 kW ANSWER DOWNLOAD EXAMIANS APP
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