Work Power And Energy Ques 4
- If a machine is lubricated with oil,
(1980, $2 \mathrm{M}$ )
(a) the mechanical advantage of the machine increases
(b) the mechanical efficiency of the machine increases
(c) both its mechanical advantage and efficiency increases
(d) its efficiency increases, but its mechanical advantage decreases
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Answer:
Correct Answer: 4.( b )