Question

Give Reason,
Machine Parts Are Frequently Oiled Or Greased.

Answer 1

Hi.....
the efficency of the machines is decreased by the any forces such as firction 
by applying the oil , grease etc the firction can be reduced and thus this can increase the efficency of the machine..
Hope helpful:-):-)

Answer 2

Answer:

Machine parts are frequently oiled or greased to reduce friction and help in the smooth running of the machine.

Continuous usage of any machine results in friction in their parts which ultimately leads to wear and tear of the machine parts. To avoid such incidents or hampering the functioning of the machines, oiling or greasing is necessary.