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If machine is lubricated with oil...

If machine is lubricated with oil

A

(a) The mechanical advantage of the machine increases

B

(b) The mechanical efficiency of the machine increases

C

(c) Both its mechanical advantage and efficiency increase

D

(d) Its efficiency increases, but its mechanical advantage decreases

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The correct Answer is:
B
Friction decreases due to lubrication, which increases efficiency. Mechanical advantage depends upon geometrical construction of machine.
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