FUNDAMENTALS OF MATERIALS SCIENCE AND E
5th Edition
ISBN: 9781119571803
Author: Callister
Publisher: WILEY
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Chapter 7.20, Problem 67QP
To determine
The modulus of elasticity
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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
Chapter 7 Solutions
FUNDAMENTALS OF MATERIALS SCIENCE AND E
Ch. 7.20 - Prob. 1QPCh. 7.20 - Prob. 2QPCh. 7.20 - Prob. 3QPCh. 7.20 - Prob. 4QPCh. 7.20 - Prob. 5QPCh. 7.20 - Prob. 6QPCh. 7.20 - Prob. 7QPCh. 7.20 - Prob. 8QPCh. 7.20 - Prob. 10QPCh. 7.20 - Prob. 11QP
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