ELECTRICITY FOR TRADES
3rd Edition
ISBN: 9780078118630
Author: Petruzella
Publisher: RENT MCG
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Chapter 3.2, Problem 5RQ
To determine
Explain the reason why polarity is normally identified on DC but not AC voltage sources.
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A 3-phase, 4-wire distributor supplies a balanced voltage of 400/230 V to a load consisting of 8 A at p.f. 0-7
lagging for R-phase, 10 A at p.f. 0-8 leading for Y phase and 12 A at unity p.f. for B phase. The resistance
of each line conductor is 0.4 2. The reactance of neutral is 0.2 2. Calculate the neutral current, the supply
voltage for R phase and draw the phasor diagram. The phase sequence is RYB. IN
ER
VR
Ref
A 3-phase, 4-wire distributor supplies a balanced voltage of 400/230 V to a
load consisting of 50 A at p.f. 0-866 lagging for R-phase, 30 A at p.f. 0-866 leading for Y phase and
30 A at unity pf. for B phase. The resistance of each line conductor is 0-2 Q. The area of X-section
of neutral is half of any line conductor: Calculate the supply end voltage for R phase. The phase
sequence is RYB.
- A 3-phase, 4-wire distributor supplies a balanced voltage of 400/230 V to a load consisting of 8 A at p.f. 0.7
lagging for R-phase, 10 A at p.f. 0-8 leading for Y phase and 12 A at unity p.f. for B phase. The resistance
of each line conductor is 0.4 2. The reactance of neutral is 0.2 2. Calculate the neutral current, the supply
voltage for R phase and draw the phasor diagram. The phase sequence is RYB.
Chapter 3 Solutions
ELECTRICITY FOR TRADES
Ch. 3.1 - Define static electricity.Ch. 3.1 - Prob. 2RQCh. 3.1 - Prob. 3RQCh. 3.1 - Prob. 4RQCh. 3.1 - Define electrostatic discharge.Ch. 3.1 - Prob. 6RQCh. 3.1 - Name three ways for a neutral object to become...Ch. 3.1 - Charging by _______________ involves an...Ch. 3.1 - Prob. 9RQCh. 3.1 - Prob. 10RQ
Ch. 3.1 - Prob. 11RQCh. 3.2 - Prob. 1RQCh. 3.2 - What is the external force that causes electron...Ch. 3.2 - Prob. 3RQCh. 3.2 - Prob. 4RQCh. 3.2 - Prob. 5RQCh. 3.2 - Prob. 6RQCh. 3.2 - Compare the operation of grid-tie and off-grid PV...Ch. 3.2 - Prob. 8RQCh. 3.2 - Name the three basic components of a battery.Ch. 3.2 - Prob. 10RQCh. 3.2 - Prob. 11RQCh. 3.2 - How does an electric generator produce...Ch. 3.2 - What type of prime mover is used as part of wind...
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