Mechanical Engineering MCQs

The coefficient of performance of electrolux refrigerator is the ratio of

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heat supplied by the gas burner to the heat absorbed by the evaporator
heat absorbed by the evaporator to the heat supplied by the gas burner
heat supplied by the gas burner minus the heat absorbed by the evaporator to the heat supplied by the gas burner
heat absorbed by the e
✅ The correct answer is option B.

Which of the following statement is correct regarding grinding of high carbon steel?

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Grinding at high speed results in the reduction of chip thickness and cutting forces per grit.
Aluminium oxide wheels are employed.
The grinding wheel has to be of open structure.
all of the above
✅ The correct answer is option D.