Understanding Motor Controls
4th Edition
ISBN: 9781337798686
Author: Stephen L. Herman
Publisher: Delmar Cengage Learning
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Chapter 30, Problem 11RQ
How is a plugging stop accomplished?
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The hydraulic cylinder BC exerts on member AB a force P directed along line BC. The force P must have a 560-N
component perpendicular to member AB.
A
M
45°
30°
C
Determine the force component along line AB.
The force component along line AB is
N.
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A telephone cable is clamped at A to the pole AB. The tension in the left-hand portion of the cable is given to be
T₁ = 815 lb.
A
15°
25°
B
T₂
Using trigonometry, determine the required tension T₂ in the right-hand portion if the resultant R of the forces exerted by the cable at
A is to be vertical.
The required tension is
lb.
What are examples of at least three (3) applications of tolerance fitting analysis.
Chapter 30 Solutions
Understanding Motor Controls
Ch. 30 - Name three methods of braking a motor.Ch. 30 - How is the braking force of drum type brakes...Ch. 30 - Why are mechanical brakes often used on cranes?
Ch. 30 - What is the advantage of dynamic brakes over...Ch. 30 - What is the disadvantage of dynamic brakes when...Ch. 30 - The amount of counter torque developed by a direct...Ch. 30 - When using dynamic braking for a direct current...Ch. 30 - Name three factors that determine the amount of...Ch. 30 - How is dynamic braking for direct current motors...Ch. 30 - How is the dynamic braking force of an alternating...
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