If an actual machine has a mechanical advantage $= 10$ and velocity ratio $= 5$ , What is its efficiency?
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Solution

The correct option is A 2
Given,
Mechanical advantage (M.A) $= 10$
Velocity ratio (V.R) $= 5$

As we know,
Efficiency, $n = \frac{M . A}{V . R}$
$= \frac{10}{5}$
$= 2$

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State one reason why is mechanical advantage less than the velocity ratio for an actual machine.

Derive a relationship between mechanical advantage, velocity ratio and efficiency of a machine.

Select the incorrect statement :

(a) A machine always has the efficiency less than $100 %$ .

(b) The mechanical advantage of a machine can be less than 1.

(d) A machine can have the mechanical advantage greater than the velocity ratio.

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