Understanding Motor Controls
3rd Edition
ISBN: 9781305498129
Author: Stephen L. Herman
Publisher: Cengage Learning
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Textbook Question
Chapter 13, Problem 1RQ
What type of pressure switch is generally used to sense small changes in low pressure systems?
Expert Solution & Answer
To determine
The type of pressure switch that is generally used to sense small variations in low-pressure system.
Explanation of Solution
Pressure switches are the switches that operate with respect to pressure variation in a system. In general, the pressure system is classified into low-pressure system and high-pressure system. The low-pressure system uses a sensitive pressure switch. The diaphragm pressure switch is classified as a sensitive pressure switch. The diaphragm can respond to small pressures.
Thus, the type of pressure switch that is generally used to sense small variations in low-pressure system is a diaphragm pressure switch.
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"11-17 The shaft shown in Figure P11-3 was designed in Problem 10-17. For the data in the
row(s) assigned from Table P11-1, and the corresponding diameter of shaft found in
Problem 10-17, design suitable bearings to support the load for at least 1E8 cycles at
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(a)
Using hydrodynamically lubricated bronze sleeve bearings with Ox = 15,
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✓ ✓
cast-iron roller
FIGURE P11-3
Shaft Design for Problems 11-17
b
gear
key
assume bearings act
as simple supports
11-19 The shaft shown in Figure P11-4 was designed in Problem 10-19. For the data in the
row(s) assigned from Table P11-1, and the corresponding diameter of shaft found in
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1200 rpm. State all assumptions.
(a)
Using hydrodynamically lubricated bronze sleeve bearings with Oy = 40,
1/d=0.80, and a clearance ratio of 0.002 5.
gear
gear
key
FIGURE P11-4
Shaft Design for Problems 11-19 and…
For the frame below calculate the bending moment at point R. Take P=40 and note that this value is used for both
the loads and the lengths of the members of the frame.
2.5P-
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Q
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R
С
45 degrees
✗
✗
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i
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Chapter 13 Solutions
Understanding Motor Controls
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