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

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 two reasons for electroplating an article.

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.

The mechanical advantage of an ideal single movable pulley is:

Differentiate between Single fixed and Single movable pulley.

What is the velocity ratio of a single movable pulley ? How does the friction in the pulley bearing affect it ?