Answer & Explanation
D) Controlling the conveyor speed, according to material flow to, reduce power consumption
Conveyors can be run continuously or with varying speeds. Controlling the speed of the conveyors, according to the rate of material flow, is called conveyor control. It is done in order to reduce the power requirements and thereby, have a cost effective production. Variable speed drives are used when speed of the conveyor needs to be changed based on certain factors. Its speed can be changed manually or via feedback drives.