North Carolina Building Contractor License Practice Exam

What should a constant pressure switch do when pressure is released on handheld power tools?

1. Activate the tool

2. Shut off the power

3. Increase the speed

4. Lower the speed

The correct answer is: Shut off the power

A constant pressure switch is designed to ensure that the operation of the power tool is directly related to the pressure applied to the switch. When the pressure on the switch is released—this typically means that the user is no longer actively using the tool—the switch should automatically shut off the power. This is a crucial safety feature as it prevents the tool from operating unexpectedly and reduces the risk of accidents or injuries when the user is not in control of the tool. This design is particularly useful for handheld power tools, where the operator’s manual control is essential for both effective use and safety. By automatically shutting off the power when the switch is not being pressed, the constant pressure switch ensures that the tool does not continue to run, which would pose a hazard. This functionality is integral to promoting safe practices in construction and repair work, making it imperative for contractors and operators to understand how these switches work and their importance in job site safety.