In a refrigerating machine, heat rejected is _________ heat absorbed.

Answer: Option B

In a refrigerating machine, the heat rejected is less than the heat absorbed. This is due to the basic principle of refrigeration cycles, where heat is absorbed from the refrigerated space (or substance) at a low temperature and rejected to a higher temperature environment.

During the refrigeration cycle, the refrigerant absorbs heat from the evaporator, causing it to evaporate and thus cooling the refrigerated space. This absorbed heat is typically less than the heat rejected by the refrigerant in the condenser, as the heat rejected includes both the heat absorbed from the refrigerated space and the additional heat input required to overcome irreversibilities and losses in the system.

Therefore, the heat rejected is less than the heat absorbed in a refrigerating machine, making Option B: Less than the correct choice.