
Understanding Motor Controls
3rd Edition
ISBN: 9781305498129
Author: Stephen L. Herman
Publisher: Cengage Learning
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Chapter 31, Problem 8RQ
To determine
Identify why the resistors used in the rotor circuit is smaller for a starter.
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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
4- A horizontal Venturi meter is used to measure the flow rate of water through the piping system
of 20 cm I.D, where the diameter of throat in the meter is d₂ = 10 cm. The pressure at inlet is
17.658 N/cm2 gauge and the vacuum pressure of 35 cm Hg at throat. Find the discharge of water.
Take Cd = 0.98.
Chapter 31 Solutions
Understanding Motor Controls
Ch. 31 - Prob. 1RQCh. 31 - Prob. 2RQCh. 31 - A wound rotor induction motor has a stator that...Ch. 31 - Name three factors that determine the amount of...Ch. 31 - Prob. 5RQCh. 31 - Explain why controlling the rotor current also...Ch. 31 - What is the function of a micro limit switch when...Ch. 31 - Prob. 8RQCh. 31 - What is rotor slip?
Ch. 31 - Prob. 10RQ
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