
Understanding Motor Controls
3rd Edition
ISBN: 9781305498129
Author: Stephen L. Herman
Publisher: Cengage Learning
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Textbook Question
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Chapter 7, Problem 1RQ
Refer to the circuit shown in Figure 7-10. If wire number 11 were disconnected at the normally open auxiliary M contact, how would the circuit operate?
Figure 7-10 Numbers are placed beside all components.
Expert Solution & Answer

To determine
Identify how the circuit would operate.
Explanation of Solution
In the given circuit, the auxiliary contact M is connected in parallel to the start button. The operation of the circuit after disconnecting the auxiliary contact M will be as follows:
- When the start button is pressed, the coil gets energized and the circuit is closed.
- After the start button is released, there is no closed circuit, and this leads to an open circuit.
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HW12
A multiple-disc clutch has five plates having four pairs of active friction surfaces. If
the intensity of pressure is not to exceed 0.127 N/mm², find the power transmitted at
500 r.p.m. The outer and inner radii of friction surfaces are 125 mm and 75 mm
respectively. Assume uniform wear and take the coefficient of friction = 0.3.
The sketch below gives some details of the human heart at rest. What is the total power
requirement (work/time) for an artificial heart pump if we use a safety factor of 5 to allow for
inefficiencies, the need to operate the heart under stress, etc.? Assume blood has the
properties of water.
p pressure above
atmosphere
blood going to the
lungs for a fresh
charge of oxygen
p = 2.9 kPa
25v pulmonary artery
d = 25mm
fresh oxygenated blood
from the lungs
p = 1.0 kPa
vena cava
d=30mm
right
auricle
pulmonary vein,
d = 28mm
aorta, d=20mm
spent blood
returning from
left
auricle
the body
p = 0.66 kPa
right
left
ventricle
ventricle
blood to feed the
body, p 13 kPa
normal blood flow
= 90 ml/s
Chapter 7 Solutions
Understanding Motor Controls
Ch. 7 - Refer to the circuit shown in Figure 7-10. If wire...Ch. 7 - Assume that when the START button is pressed M...Ch. 7 - Explain the difference between a motor starter and...Ch. 7 - Refer to the schematic in Figure 7-10. Assume that...Ch. 7 - Explain the difference between load and auxiliary...Ch. 7 - Prob. 6RQCh. 7 - In a schematic diagram, what does a dashed line...
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