Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Textbook Question
Chapter 12, Problem 5SQ
When the thermostat contacts close, the blower motor starts and heating element #1 turns on. After a time delay heating element #3 turns on, but heating element #2 never turns on. Which of the following could cause this condition?
- a. Timed contact T1 did not close.
- b. Heating element #2 is open.
- c. CR relay coil is open.
- d. The flow switch is defective and did not close its contacts.
FIG. 12–10 Air flow must be present before heating elements can be energized.
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3-3) Similar to Lathi & Ding prob. 3.3-7.
The signals in the figure below are modulated signals with carrier cos(5t). Find the Fourier transforms of
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Hint: these functions can be expressed in the form g(t) cos(2лfot)
(a)
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1
2π
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σπ
(b)
(c)
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Chapter 12 Solutions
Electric Motor Control
Ch. 12 - Prob. 1SQCh. 12 - Draw a line diagram to show that a green light...Ch. 12 - Draw a one-line diagram showing a bell that will...Ch. 12 - To answer the following questions refer to Figure...Ch. 12 - When the thermostat contacts close, the blower...Ch. 12 - When the thermostat contacts close, the blower...Ch. 12 - When the thermostat contacts close the blower...
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