Block and Tackle System

Q.

With reference to the terms mechanical advantage, velocity ratio and efficiency of a machine, name and define the term that will not change for a machine of a given design.

Q.

The given figure shows a block and tackle system of pulleys used to lift a load. When the load pulled up by a distance 1m, how much do the effort end move?

1. 6 m

2. 2 m

3. 8 m

4. 4 m

Q.

In a block and tackle system, a load of 7.5 Kg is raised with an effort of 2.5 kgf. If there are three pulleys in the system, find its efficiency.

1. 50%

2. 75%

3. 100%

4. 125%

Q.

The compound or the block, and the tackle system uses:-

1. multiple fixed pulleys

2. movable pulley

3. multiple fixed and movable pulleys

4. a single movable pulley