If M.A and V.R are the ideal mechanical advantage and velocity ratio of a pulley, then its efficiency is:

\frac{M . A}{V . R}

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(M . A) (V . R)

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\frac{V . R}{M . A}

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None of the above

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Solution

The correct option is A $\frac{M . A}{V . R}$
Efficiency of a pulley is given by the formulae , $\frac{M e c h a n i c a l A d v a n t a g e}{V e l o c i t y R a t i o} * 100$
Where, Mechanical advantage $= \frac{L o a d}{E f f o r t}$
and Velocity Ratio $= \frac{D i s t a n c e m o v e d b y e f f o r t}{D i s t a n c e m o v e d b y l o a d}$

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If M.A and V.R are the ideal mechanical advantage and velocity ratio of a pulley, then its efficiency is:

The correct option is A M.AV.REfficiency of a pulley is given by the formulae , Mechanical AdvantageVelocity Ratio∗100Where, Mechanical advantage =LoadEffortand Velocity Ratio =Distance moved by effortDistance moved by load