Question

The diagrams show four pulley systems. State which of the statements following the diagrams is true.

Options

• There are three pulley systems with V.R. = 2 and one pulley system with V.R. = 1.

• There are two pulley systems with V.R. = 2, one pulley system with V.R. = 3 and one pulley system with V.R. = 1.

• There are two pulley systems with V.R. = 2, one pulley system with V.R.= 3 and one pulley system with V.R. = 4.

• There are two pulley systems with V.R. = 2 and two pulley system with V.R. = 3.

Answer 1

There are two pulley systems with V.R. = 2, one pulley system with V.R.= 3 and one pulley system with V.R. = 4.

Explanation:

The velocity ratio of a pulley system is the number of rope segments supporting the load. Counting these supporting segments in the four systems gives velocity ratios of 2, 2, 3 and 4.