Understanding Motor Controls
3rd Edition
ISBN: 9781305498129
Author: Stephen L. Herman
Publisher: Cengage Learning
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Question
Chapter 2, Problem 9RQ
To determine
The reason for using a circle to denote a coil in a schematic of motor control.
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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
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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.
4. Describe two type of starting system principles and draw
the basic starting circuit
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 2 Solutions
Understanding Motor Controls
Ch. 2 - Prob. 1RQCh. 2 - The symbol shown is:
Normally closed float...Ch. 2 - The symbol shown is: a. Iron core transformer b....Ch. 2 - The symbol shown is:
Normally open pressure...Ch. 2 - The symbol shown is: a. Double acting push button...Ch. 2 - If you were installing the circuit in Figure 233,...Ch. 2 - Referring to the circuit in Figure 2–33, should...Ch. 2 - Prob. 8RQCh. 2 - Prob. 9RQCh. 2 - When reading a schematic diagram, are the control...
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- What pin numbers are connected to the coil of an 8-pin control relay?arrow_forwardRefer to the schematic diagram in Figure 318. Assume that the motor is not running. When the third speed push button is pressed, the motor starts in its lowest speed. After a delay of 3 seconds, the motor accelerates to second speed and 3 seconds later to third speed. After a period of about 1 minute, the fourth speed push button is pressed, but the motor does not accelerate to fourth speed. Which of the following could cause this problem? a. Control relay CR2 coil is open. b. S2 contactor coil is open. c. CR3 coil is shorted. d. S3 contactor coil is open.arrow_forwardWhy are SCRs used to construct a bridge rectifier in many solid-state variable frequency drives?arrow_forward
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