North Carolina Building Contractor License Practice Exam

What is the purpose of a constant pressure switch on handheld power tools?

1. To increase power

2. To control tool operation

3. To regulate speed

4. To maintain constant pressure

The correct answer is: To control tool operation

The purpose of a constant pressure switch on handheld power tools is to control tool operation effectively. This type of switch requires the user to maintain a certain amount of pressure for the tool to operate. When the user applies pressure, the switch activates the tool, allowing it to function only while there is adequate pressure. This design helps in preventing accidental activation, ensuring that the tool is only on when intended, which enhances user safety and control. It provides a straightforward way to govern the operation of the tool, as the user must actively engage with it rather than relying solely on an on/off switch. While maintaining constant pressure is related to the switch’s function, the primary role is to control operation rather than solely measuring or holding pressure. Functions like increasing power or regulating speed are typically managed through other mechanisms or settings within the tool.