Answer is:
Dry friction
Explanation:
Dry friction occurs in an un-lubricated journal bearing.
![Which one of the following frictions occurs in an un-lubricated journal bearing ?](https://mcqfinder.in/uploads/images/objective-questions/fitter-set-1-lubricants-and-coolants/fitter-set-1-lubricants-and-coolants-id-11-e.jpg)
Answer is:
Grey cast iron
Explanation:
In Grey cast iron materials no cutting oil is used when drilling.
![In which one of the following materials no cutting oil is used when drilling ?](https://mcqfinder.in/uploads/images/objective-questions/fitter-set-1-lubricants-and-coolants/fitter-set-1-lubricants-and-coolants-id-12-e.jpg)
Answer is:
Cutting oil
Explanation:
when cutting steel with hand hacksaw, cutting oil is used .
Answer is:
Carry away the heat produced in bearing
Answer is: