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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

Text Solution

Verified by Experts

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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A cubical block (of side 2 m ) of mass 20 kg slides on inclined plane lubricated with the oil of viscosity eta=10^(-1) with constant velocity of 10 ms^(-1) . Find out the thickness of the layer of liquid (take g = 10 ms^(-2) ).

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Knowledge Check

  • Which one of the following can also act as a lubricant in the machines?

    A
    Iron fillings
    B
    Polish on machines
    C
    Flow of waler through the machine
    D
    Flow of compressed and purifie air.

  • When two surfaces are coated with a lubricant, then they

    A
    stick to each other
    B
    slide upon each other
    C
    roll upon each other
    D
    none of the these

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