Overhead Crane Practice Test

What type of switch controls the upper limit of the load block on a hoist?

1. Safety switch

2. Hoist limit switch

3. Overload switch

4. Controller switch

The correct answer is: Hoist limit switch

The hoist limit switch is specifically designed to control the upper limit of the load block on a hoist. This switch is a critical safety feature in crane operation, as it automatically stops the hoisting motion when the load block reaches a predetermined height. This prevents potential damage to the hoist, load, and surrounding structures by ensuring that the load does not exceed safe operational limits. The hoist limit switch typically operates by sensing the position of the load block. When the block reaches the upper limit, the switch is activated, cutting the power to the hoist motor and halting further movement. This is essential for maintaining safety in the operation of overhead cranes, as it helps to prevent accidents and equipment failure. In contrast, safety switches, overload switches, and controller switches serve different functions. While safety switches generally involve shutting down power in various emergency situations, overload switches are designed to prevent lifting when the weight exceeds the hoist's rated capacity. Controller switches facilitate the operator's control over various crane operations but do not specifically handle the upper limit of the load block. Therefore, the hoist limit switch's unique role in managing load height makes it the correct choice in this context.