ELECTRICAL WIRING:RESIDENTAL-6 PLANS
18th Edition
ISBN: 9781305098329
Author: MULLIN
Publisher: CENGAGE L
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Textbook Question
Chapter 29, Problem 10R
Why is it permissible to omit an electric space heater, water heater, and certain other 240-volt equipment when calculating the neutral service-entrance conductor for a residence? ____
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A three-phase transmission line supplies power to three loads at a voltage
408 Vrms (line to line). The loads are as follows:
Load 1:
S₁ = 100+ j50 VA
Load 2:
S₂ = 40-j20 VA
Load 3:
S3 = 10 + j0 VA
Find the magnitude of the line current | Line and the combined power factor of
the loads.
Hint:
Steral \= √3 | Vime |× | Ime |
line
line
Can you show why the answer to this question R = 199 ohm?
2.5. Find the half-power beamwidth (HPBW) and first-null beamwidth (FNBW), in radians and degrees, for the following normalized radiation intensities: (a) U(9) cos θ cos(20) (b) U(θ)-cos2 θ cos2(26) (c) U(θ) = cos(θ) cos(30) (0 < θ < 900,0 < φ 360) (d) U(t) = cos2(9) cos2(39) (e) U(9) = cos(29) cos(39) (f) U (ecos (20) cos (30)
Chapter 29 Solutions
ELECTRICAL WIRING:RESIDENTAL-6 PLANS
Ch. 29 - Prob. 1RCh. 29 - a. What is the unit load per ft2 for the general...Ch. 29 - a. What is the ampere rating of the circuits that...Ch. 29 - Why is the air-conditioning load for this...Ch. 29 - What demand factor may be applied when four or...Ch. 29 - What load may be used for an electric range rated...Ch. 29 - What is the calculated load for an electric range...Ch. 29 - What is the calculated load when fixed electric...Ch. 29 - On what basis is the neutral conductor of a...Ch. 29 - Why is it permissible to omit an electric space...
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