True or False? A speed variance of 30% can be made using an adjustable pulley.

An adjustable pulley system is designed to change the speed of a connected load effectively, which makes it possible to achieve significant speed variances within certain limits. A speed variance of 30% can indeed be obtained by adjusting the size of the pulleys or the configuration of the belt, depending on the specifics of the system. This flexibility allows an operator to fine-tune the performance of a motor-driven system to meet varying conditions without the need for extensive modifications.

The weight and diameter of the adjustable pulleys play a crucial role in achieving that speed variance. By changing the pulley diameters, one can either increase or decrease the speed of the driven shaft, thereby allowing for such a percentage change. Thus, the nature of adjustable pulleys supports their capability to achieve a 30% variance in speed.

Although certain factors, such as pulley size or the type of motor, can influence the effectiveness and range of speed variations achievable, the general principle that enables a 30% speed change remains sound.