Electric Circuits (10th Edition)
10th Edition
ISBN: 9780133760033
Author: James W. Nilsson, Susan Riedel
Publisher: PEARSON
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Chapter 11, Problem 41P
To determine
Find the reading of the two wattmeters.
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Students have asked these similar questions
A dc compound motor having a rating of 10 kW,
1150 r/min, 230 V, 50 A, has the following losses at
full-load:
bearing friction loss
40 W
brush friction loss
==
50 W
windage loss
=
200 W
(1)
total mechanical losses
=
290 W
(2)
iron losses
=
420 W
(3)
copper loss in the shunt field
=
120 W
copper losses at full-load:
(4)
a. in the armature
b. in the series field
c. in the commutating winding
total copper loss in the
500 W
25 W
70 W
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=
595 W
4 What determines the power rating of a ma-
chine?
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put power must be reduced. Explain.
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may we load it above its rated power? Why?
An electric motor driving a skip hoist with-
draws 1.5 metric tons of minerals from a
trench 20 m deep every 30 seconds. If the
hoist has an overall efficiency of 94 percent,
calculate the power output of the motor in
horsepower and in kilowatts.
Chapter 11 Solutions
Electric Circuits (10th Edition)
Ch. 11.3 - The voltage from A to N in a balanced three-phase...Ch. 11.3 - Prob. 2APCh. 11.4 - Prob. 4APCh. 11.4 - Prob. 5APCh. 11.4 - Prob. 6APCh. 11.4 - Prob. 7APCh. 11.5 - Prob. 8APCh. 11.5 - Prob. 9APCh. 11 - Prob. 1PCh. 11 - Prob. 3P
Ch. 11 - Prob. 4PCh. 11 - Repeat Problem 11.4 but assume that the...Ch. 11 - Prob. 6PCh. 11 - Find I0 in the circuit in Fig. P11.7.
Find...Ch. 11 - Find the rms value of Io in the unbalanced...Ch. 11 - The time-domain expressions for three...Ch. 11 - Prob. 10PCh. 11 - The magnitude of the line voltage at the terminals...Ch. 11 - A balanced Δ-connected load has an impedance of...Ch. 11 - A balanced, three-phase circuit is characterized...Ch. 11 - Prob. 15PCh. 11 - In a balanced three-phase system, the source is a...Ch. 11 - Prob. 17PCh. 11 - The impedance Z in the balanced three-phase...Ch. 11 - For the circuit shown in Fig. P11.20, find
the...Ch. 11 - A balanced three-phase Δ-connected source is shown...Ch. 11 - Prob. 22PCh. 11 - Fine the rms magnitude and the phase angle of ICA...Ch. 11 - Prob. 24PCh. 11 - Prob. 25PCh. 11 - The line-to-neutral voltage at the terminals of...Ch. 11 - Prob. 27PCh. 11 - Prob. 28PCh. 11 - Prob. 29PCh. 11 - Calculate the complex power in each phase of the...Ch. 11 - Prob. 31PCh. 11 - Prob. 32PCh. 11 - Prob. 33PCh. 11 - Prob. 34PCh. 11 - Prob. 35PCh. 11 - Three balanced three-phase loads are connected in...Ch. 11 - Prob. 37PCh. 11 - Prob. 38PCh. 11 - Prob. 40PCh. 11 - Prob. 41PCh. 11 - Prob. 42PCh. 11 - Prob. 43PCh. 11 - Prob. 44PCh. 11 - Prob. 45PCh. 11 - Prob. 46PCh. 11 - Prob. 47PCh. 11 - Prob. 48PCh. 11 - Prob. 49PCh. 11 - Prob. 50PCh. 11 - Prob. 51PCh. 11 - Find the reading of each wattmeter in the circuit...Ch. 11 - Prob. 53PCh. 11 - Prob. 54PCh. 11 - Prob. 55PCh. 11 - Prob. 56PCh. 11 - Prob. 57PCh. 11 - Prob. 58PCh. 11 - Prob. 59PCh. 11 - Assume in Problem 11.59 that when the load drops...
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