Which of the following statements is not true for a machine:

It always has efficiency less than

100 %

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Its mechanical advantage can be less than

1

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It can also be used as a speed multiplier.

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It can have a mechanical advantage greater than the velocity ratio.

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Solution

The correct option is D It can have a mechanical advantage greater than the velocity ratio.
Machine has efficiency less than $100 %$
Machine can have a mechanical advantage than 1. It can also be used as a speed multiplier.

Efficiency ( $η$ ) $=$ $\frac{m e c h a n i c a l a d v a n t a g e (M . A)}{v e l o c i t y r a t i o (V . R)}$ $\times$ $100 %$
if mechanical advantage is greater than velocity ratio then the efficiency percentage becomes greater than $100$ , which is not possible.

Suggest Corrections

Similar questions

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.

A single fixed pulley is used because it :

(a) ha sthe mechanical advantage greater than 1

(b) has the velocity ratio less than 1

(d) helps to apply the effort in a convenient direction.

Q. Which class of levers has a mechanical advantage always greater than one? What change can be brought about in this lever to increase its mechanical advantage?

Which type of lever has a mechanical advantage always more than 1 ? Give reason with one example. What change can be made in this lever to increase its mechanical advantage ?

The lever for which the mechanical advantage is always less than 1 has the :

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