Electric Motor Control
Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Chapter 4, Problem 1SQ

Identify the following symbols.

Chapter 4, Problem 1SQ, Identify the following symbols. , example  1

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Expert Solution & Answer
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To determine

Identify the given symbols.

Explanation of Solution

Discussion:

The names of the symbols are provided in Table 1.

Table 1

PartName of the symbolDescription
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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