Chapter 41, Problem 1RQ

To answer the following questions refer to the circuit in Figure 41–6.

The pressure switch is shown as:

1. a. Normally open
2. b. Normally closed
3. c. Normally open held closed
4. d. Normally closed held open

To determine

The state of the pressure switch used in the circuit shown in Figure 41-6.

Explanation of Solution

Refer text book Figure 41-6.

The pressure switch shown in the circuit has its movable contact above the fixed contact. Hence, the pressure switch is normally closed and kept open for the circuitry purpose. This switch is called a “normally closed held open switch”. The schematic of normally closed held open pressure switch is shown in Figure 1 below:

Thus, the correct answer is “option d. normally closed held open”.