An actual pulley system always has a mechanical advantage less than a velocity ratio. It is because:

a part of effort is wasted in overcoming friction

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a part of the effort is wasted in overcoming the load of movable block

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both (a) and (b)

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none of the above

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Solution

The correct option is C
both (a) and (b)

When an effort is applied to the string of a pulley then:
Opposite force friction is generated which reduces the effect of the effort (E) on the pulley
Some part of the effort is used to overcome the load of the movable block.
Hence, option (c) is correct.

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Similar questions

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.

Give reasons for the following :

(a) In a single fixed pulley, the velocity ratio is always more than the mechanical advantage.

(b) The efficiency of a movable pulley is always less than $100 %$ .

(d) The lower block of a block and tackle pulley system must be of negligible weight.

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

In a single fixed pulley, the velocity ratio is always less than the mechanical advantage.

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