Electrical Wiring Residential
18th Edition
ISBN: 9781285170954
Author: Ray C. Mullin, Phil Simmons
Publisher: Cengage Learning
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Textbook Question
Chapter 12, Problem 17R
Each 20-ampere small-appliance branch-circuit load demand shall be determined at _____. (Circle the correct answer.)
- a. 2400 volt-amperes
- b. 1500 volt-amperes
- c. 1920 volt-amperes
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Students have asked these similar questions
Show with the aid of a phasor diagram that for both
star- and delta-connected balanced loads, the total active
power is given by √3VI cos φ, where V and I are the
line values of voltage and current respectively and φ is
the angle between phase values of voltage and current.
A balanced three-phase load consists of three
coils, each of resistance 4 Ω and inductance 0.02 H.
Determine the total active power when the coils are (a)
star-connected, (b) delta-connected to a 400 V, three
phase, 50 Hz supply.
ANS:11.56 kW, 34.7 kW
The load connected to a three-phase supply comprises
three similar coils connected in star. The line currents
are 25 A and the apparent and active power inputs are
20 kVA and 11 kW respectively. Find the line and
phase voltages, reactive power input and the resistance
and reactance of each coil. If the coils are now con
nected in delta to the same three-phase supply, calculate
the line currents and the active power taken. ANS :
462 V, 267 V, 16.7 kvar, 5.87 Ω, 8.92 Ω; 75 A, 33 kW
A three-phase delta-connected load, each phase of which
has an inductive reactance of 40 Ω and a resistance
of 25 Ω, is fed from the secondary of a three-phase
star-connected transformer which has a phase voltage
of 230 V. Draw the circuit diagram of the system and
calculate: (a) the current in each phase of the load; (b)
the p.d. across each phase of the load; (c) the current
in the transformer secondary windings; the total
active power taken from the supply and its power factor.
Chapter 12 Solutions
Electrical Wiring Residential
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