Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Chapter 39, Problem 6SQ
Why must a discharge resistor be connected in the field circuit for starting?
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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 39 Solutions
Electric Motor Control
Ch. 39 - Prob. 1SQCh. 39 - What is the effect of the starting winding of the...Ch. 39 - What are typical applications of synchronous...Ch. 39 - Prob. 4SQCh. 39 - A loaded synchronous motor cannot operate...Ch. 39 - Why must a discharge resistor be connected in the...Ch. 39 - Depending on their power factor ratings, what is...Ch. 39 - At what power factor do incandescent lights...Ch. 39 - Prob. 9SQCh. 39 - The speed of a synchronous motor is fixed by the...
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