Industrial Motor Control
7th Edition
ISBN: 9781133691808
Author: Stephen Herman
Publisher: Cengage Learning
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Chapter 48, Problem 1RQ
To determine
The correct option for the pressure swtich.
Expert Solution & Answer
Explanation of Solution
Refer to the circuit in Figure 48-6 in the text book. The pressure swtich found the application where it is necessary to sense the pressure of the pneumatic or hydraulics system.
The pressure switch in the figure is normally closed and is held open as the circuit must be completed before the pressure is released.
Thus, the correct option is d. The normally closed held open.
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Chapter 48 Solutions
Industrial Motor Control
Ch. 48 - Prob. 1RQCh. 48 - To answer the following questions, refer to the...Ch. 48 - Prob. 3RQCh. 48 - To answer the following questions, refer to the...Ch. 48 - To answer the following questions, refer to the...Ch. 48 - Prob. 6RQCh. 48 - To answer the following questions, refer to the...Ch. 48 - To answer the following questions, refer to the...Ch. 48 - Prob. 9RQCh. 48 - Prob. 10RQ
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- To answer the following questions refer to the circuit in Figure 416. What is the purpose of the rotary switch connected after the pressure switch?arrow_forwardReferring to the circuit in Figure 2–33, should the float switch be connected as a normally open or normally closed switch?arrow_forwardTo answer the following questions refer to the circuit shown in Figure 41–10. Assume that the third speed push button is pressed. Explain the sequence of operation for the circuit.arrow_forward
- The symbol shown is: Normally closed float switch Normally open held closed float switch Normally open float switch Normally closed held open float switcharrow_forwardWhat is the primary use of a limit switch?arrow_forwardTo answer the following questions refer to the circuit in Figure 416. When the pressure switch closes, which starter will energize first, 1M or 2M? Explain your answer.arrow_forward
- To answer the following questions refer to the circuit shown in Figure 4110. Assume that the third speed push button is pressed and the motor starts in its first or lowest speed. After a delay of 3 seconds, the motor accelerates to its second speed, but never accelerates to its highest or third speed. Which of the following could cause this problem? a. CR coil is open. b. Coil 2TR is open. c. Coil 1TR is open. d. Coil 1S is open.arrow_forwardThe symbol shown is: a. Double acting push button b. Two-position selector switch c. Three-position selector switch d. Maintained contact push buttonarrow_forwardWhen using a rod type float switch, how is the amount float movement required to open or close the contacts adjusted?arrow_forward
- A pressure switch is to be installed in a circuit that requires it to have three normally open contacts and one normally closed contact. The switch actually has one normally open Contact What must be done to permit this pressure switch to operate in this circuit?arrow_forwardRefer to the circuit shown in Figure 2614. When the START button is pressed, the control transformer fuse blows immediately. Which of the following could not cause this problem? a. Control relay coil CR is shorted. b. Starter coil 1M is shorted. c. Contactor coil S is shorted. d. Contactor coil 2M is shorted.arrow_forwardWhat is an SPST switch?arrow_forward
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