Understanding Motor Controls
4th Edition
ISBN: 9781337798686
Author: Stephen L. Herman
Publisher: Delmar Cengage Learning
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Textbook Question
Chapter 13, Problem 4RQ
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?
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Chapter 13 Solutions
Understanding Motor Controls
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- When using a rod type float switch, how is the amount float movement required to open or close the contacts adjusted?arrow_forwardTo answer the following questions refer to the circuit in Figure 416. The pressure switch is shown as: a. Normally open b. Normally closed c. Normally open held closed d. Normally closed held openarrow_forwardWhat type of pressure switch is generally used to sense small changes in low pressure systems?arrow_forward
- Referring to the circuit in Figure 2–33, should the float switch be connected as a normally open or normally closed switch?arrow_forwardThe symbol shown is: Normally closed float switch Normally open held closed float switch Normally open float switch Normally closed held open float switcharrow_forwardWhy are the contacts of a micro switch spring loaded?arrow_forward
- Explain the difference between auxiliary contacts and load contacts.arrow_forwardRefer to the circuit shown in Figure 5-29. Is the thermostat contact normally open, normally closed, normally closed held open, or normally open held closed? Figure 5-29 The contactor contains both load and auxiliary contacts.arrow_forwardWhat two types of switches are normally found in the subbase of a low-voltage thermostat?arrow_forward
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