Understanding Motor Controls
4th Edition
ISBN: 9781337798686
Author: Stephen L. Herman
Publisher: Delmar Cengage Learning
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Question
Chapter 23, Problem 4RQ
To determine
The function of the hold coil and the pick-up coil.
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What is the Relay Number and its law?
A three-phase supply connected to the stator of a three-phase induction machine, creates a:
stationary magnetic field.
O rotating magnetic field.
O alternating magnetic field.
constant electric field.
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.
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Understanding Motor Controls
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