Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Textbook Question
Chapter 4, Problem 1SQ
Identify the following symbols.
Expert Solution & Answer
To determine
Identify the given symbols.
Explanation of Solution
Discussion:
The names of the symbols are provided in Table 1.
Table 1
Part | Name of the symbol | Description |
a. | Normally open, momentary contact push button. | It is a type of push button, through which two contacts are closed or opened at a time. |
b. | Double-acting, momentary contact push button. | It is a type of push button, through which two operations can be performed using single push button. |
c. | Mushroom head, normally closed, momentary contact push button. | It is a palm operated push button. |
d. | Normally open pressure switch. | It is a type of pressure control relay. |
e. | Normally closed float switch. | It is a type of pilot devices. It controls the circuit through single contact. |
f. | Three-phase squirrel cage motor. | It is a type of motor. |
g. | Current transformer. | It is a type of transformer that is mostly used in large motor starters to step down the current. |
h. | Three-phase disconnect switch. | It is a type of switch that is used to disconnect the three phases from supply. |
i. | Normally open contact. | It is a type of switch, in which no current flows in the circuit. |
j. | Normally open, on-delay timer contact. | It is a type of timed contacts. |
k. | Normally open, off-delay timer contact. | It is a type of timed contacts. |
l. | Normally open limit switch. | It is a type of limit switch. |
m. | Node point showing connected conductors. | It is a point at which two or more conductors are connected. |
n. | Red pilot light. | It is mostly used for the indication of pilot lights. |
o. | Normally open switch (single-pole single-throw switch). | It is a type of switch. By single throw, the switch can be either opened or closed. |
p. | Double-break switch. | It is a type of switch, in which two contacts are to be opened or closed at a time. |
Conclusion:
Thus, the names for the given symbols are provided.
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Chapter 4 Solutions
Electric Motor Control
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