EBK 3N3-EBK: INDUSTRIAL MOTOR CONTROL
7th Edition
ISBN: 9780176919962
Author: Herman
Publisher: VST
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Textbook Question
Chapter 29, Problem 4RQ
What would be the danger, if any, if the circuit were wired as stated in question 3?
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The diagram shows a brass rod and an iron rod beside each other at the bottom of a
rectangular coil. What happens when a d.c. current passes through the coil?
to d.c.
supply
rectangular
coil
brass
iron
rod
rod
Only the brass rod is magnetized
Only the iron rod is magnetized
The two rods attract each óther
The two rods repel each other.
From the following identify the true
statement.
OIn general safety precaution, the
operator should know the procedure to
switch OFF the power and lock it in
position.
O In housekeeping safety
precaution, compressed air should not
be used to clean the machine.
O In electrical safety precaution, all non-
metallic parts externally accessible must
always be earthed.
O In general safety precaution, the
inflammable materials need not be kept
near to electrical controls
What happens when the low-voltage current flow in the coil primary winding is interrupted by the switching device?
The primary winding delivers a high-voltage spark to the plugs.
The magnetic field in the coil primary builds.
The secondary voltage drops to zero volts.
High voltage is induced in the secondary windin
Chapter 29 Solutions
EBK 3N3-EBK: INDUSTRIAL MOTOR CONTROL
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