Electrical Wiring Residential
18th Edition
ISBN: 9781285170954
Author: Ray C. Mullin, Phil Simmons
Publisher: Cengage Learning
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Chapter 23.1, Problem 9R
What advantages does a 240-volt heating unit have over a 120-volt heating unit?
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"Can you explain the integration method to show
the result?"
The radiation intensity of an aperture antenna, mounted on an infinite ground plane
with perpendicular to the aperture, is rotationally symmetric (not a function of 4),
and it is given by
U =
π sin
Find the approximate directivity (dimensionless and in dB) using
(a) numerical integration. Use the DIRECTIVITY computer program at the end of this
chapter.
U
sin ( sin )
sin
(a)
Directly
Do = 14.0707
= 10log (14.0707)
= 11.48 dB
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Chapter 23 Solutions
Electrical Wiring Residential
Ch. 23.1 - a. What is the allowance in watts made for...Ch. 23.1 - What are some of the advantages of electric...Ch. 23.1 - List the different types of electric heating...Ch. 23.1 - There are two basic voltage classifications for...Ch. 23.1 - What device is required when the total connected...Ch. 23.1 - Prob. 6RCh. 23.1 - Prob. 7RCh. 23.1 - A certain type of control connects electric...Ch. 23.1 - What advantages does a 240-volt heating unit have...Ch. 23.1 - The white wire of a cable may be used to connect...
Ch. 23.1 - Receptacle outlets furnished as part of a...Ch. 23.1 - The branch circuit supplying a fixed electric...Ch. 23.1 - Prob. 13RCh. 23.1 - For ballpark calculations, the wattage output of a...Ch. 23.1 - A central electric furnace heating system is...Ch. 23.1 - What section of the Code provides the correct...Ch. 23.1 - Electric heating cable embedded in plaster, or...Ch. 23.2 - Prob. 1RCh. 23.2 - Prob. 2RCh. 23.2 - Prob. 3RCh. 23.2 - a. Must an air conditioner installed in a window...Ch. 23.2 - Prob. 5RCh. 23.2 - What is the Code requirement for receptacles...Ch. 23.2 - Prob. 7RCh. 23.2 - When the nameplate on an air-conditioning unit...Ch. 23.2 - Prob. 9RCh. 23.2 - Match the following terms with the statement that...Ch. 23.2 - The disconnect for an air conditioner or heat pump...
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