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A movable pulley is used as:...

A movable pulley is used as:

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State whether the following statements are true or false by writing T or F. (a) The velocity ratio of a single fixed pulley is always more than 1. (b) The velocity ratio of a single movable pulley is always 2. (c) The velocity ratio of a combination of n movable pulleys with a fixed pulley is always 2^(n) . (d) The velocity ratio of a block and tackle system is always equal to the number of strands of the tackle supporting the load.

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%. (c) In case of a block and tackle system, the mechanical advantage increases with the increase in the number of pulleys. (d) The lower block of a block and tackle pulley system must be of negligible weight.

A single fixed pulley and a movable pulley both are separately used to lift a load of 50 kgf to the same height. Compare the efforts applied

Give two reasons why the efficiency of a single movable pulley is not 100%.

In the pulley system shown in figure the movable pulleys A,B and C are of mass 1 kg each D and E are fixed pulleys are light and inexensible. Choose the correct alternative (s).

In a single movable pulley, if the effort moves by a distance x upwards, by what height is the load raised ?