railway RRB JE (CBT I + CBT II) Mock Test 2024 Refrigeration and Air Conditioning Refrigerants

A refrigeration system 

1
Extracts heat from a cold body and delivers to a hot body 
2
Extracts heat from a hot body and delivers to a cold body 
3
Rejects heat to a cold body 
4
Rejects heat to a hot body
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