Industrial Motor Control
7th Edition
ISBN: 9781133691808
Author: Stephen Herman
Publisher: Cengage Learning
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Chapter 11, Problem 3RQ
Refer to the circuit shown in Figure 11–11. Assume that the platform is located on the bottom floor. When the UP push button is pressed, the pump motor does not start. Which of the following could not cause this problem?
- a. The contacts of limit switch LS1 are closed.
- b. The contacts of limit switch LS2 are open.
- c. Motor starter coil M is open.
- d. The overload contact is open.
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Y
F1
α
В
X
F2
You and your friends are planning to move the log. The log.
needs to be moved straight in the x-axis direction and it
takes a combined force of 2.9 kN. You (F1) are able to exert
610 N at a = 32°. What magnitude (F2) and direction (B) do
you needs your friends to pull?
Your friends had to pull at:
magnitude in Newton, F2
=
direction in degrees, ẞ =
N
deg
Problem 1
8 in.
in.
PROBLEM 15.109
Knowing that at the instant shown crank BC has a constant angular
velocity of 45 rpm clockwise, determine the acceleration (a) of Point A,
(b) of Point D.
8 in.
Answer: convert rpm to rad/sec first. (a). -51.2j in/s²; (b). 176.6 i + 50.8 j in/s²
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