engineering recuitment BEL Probationary Engineers Mock Test 2025 Refrigeration and Air Conditioning Refrigeration Cycles and Devices Heat Engine, Heat Pump and Refrigerator
When the lower temperature of the refrigerating machine is fixed then the coefficient of performance .can be improved by
1
Operating the machine at high speed
2
Operating the machine at low speed
3
Raising the higher temperature
4
Lowering the higher temperature