Electric Machinery and Power System Fundamentals
1st Edition
ISBN: 9780072291353
Author: Stephen J. Chapman, Stepehn J. Chapman
Publisher: McGraw-Hill Companies, The
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Chapter 3, Problem 3.7P
Modify the MATLAB in Example 3-1 by swapping the currents flowing in any two phases. What happens to the resulting net magnetic field?
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Fundimentals of Energy Systems Q8
Two wattmeters are used to measure power in a three
phase, three-wire network. Show by means of connection
and complexor (phasor) diagrams that the sum of the
wattmeter readings will measure the total active power.
Two such wattmeters read 120 W and 50 W when
connected to measure the active power taken by a balanced three-phase load. Find the power factor of the load.
If one wattmeter tends to read in the reverse direction,
explain what changes may have occurred in the circuit
ANS:
0.815
Fundimentals of Energy Systems Q7
Chapter 3 Solutions
Electric Machinery and Power System Fundamentals
Ch. 3 - What is the principal difference between a...Ch. 3 - Prob. 3.2QCh. 3 - Prob. 3.3QCh. 3 - What is the equation for the induced torque in an...Ch. 3 - The simple loop rotating in a uniform magnetic...Ch. 3 - Prob. 3.2PCh. 3 - The first ac power system in the United States ran...Ch. 3 - A three-phase, Y-connected, four-pole winding is...Ch. 3 - A three-phase, -connected, six-pole winding is...Ch. 3 - A three-phase, Y-connected, 60 Hz, two-pole...
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