Understanding Motor Controls
4th Edition
ISBN: 9781337798686
Author: Stephen L. Herman
Publisher: Delmar Cengage Learning
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Question
Chapter 2, Problem 1RQ
To determine
The name of the symbol from the given options.
Expert Solution & Answer
Explanation of Solution
The symbol shown in Figure 1 is used in a schematic of control circuits to designate normally open contact.
Two parallel horizontal lines or vertical lines are used to indicate a normally open contact. The normally open contact in a circuit schematic depicts that the circuit is open and no current flow is present.
Thus, the correct answer is “option d. Normally open contact”.
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- Refer to Figure 21–1 to answer the following questions. When switch HOA SW 122 is in the off position, which contacts have connection between them?arrow_forwardName three factors that determine the amount of induced voltage.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_forward
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