Delmar's Standard Textbook Of Electricity
7th Edition
ISBN: 9781337900348
Author: Stephen L. Herman
Publisher: Cengage Learning
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Chapter 35, Problem 3RQ
Would a positive-rotating harmonic or a negative-rotating harmonic be more harmful to an induction motor? Explain your answer.
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1. A 600-V, 150-HP, 600 r.p.m. d.c. series motor has an armature and series field resistance of 0.120 and
0.040, respectively. The full-load current is 200A.
(a) Find the back e.m.f. at full-load.
(b) Find the armature developed power and torque at full-load.
Ans. [568V, 1808.13 N.m]
3.
An electrical device shown below has the following depicted voltage and current
definition. The current in and the voltage vin for a certain period is recorded as shown in the
bottom picture.
(1) In different periods from 0 to time T4, determine if the electrical device works as a load or a
source.
iin
+
iin
Vin
Electrical Device
0
T₁
T2
T3
ΤΑ
t
Vin
T2
ΤΑ
t
1. A 220V d.c. shunt motor has a 5V brush drop, an armature resistance of 0.20, and a rated armature
current of 40A. Calculate:
(a) the counter-back e.m.f. (EC),
(b) power developed by the armature (Pd) in watts
(c) mechanical power developed by the armature in horsepower.
Ans.[207V, 8280 W, 11.099hp]
Chapter 35 Solutions
Delmar's Standard Textbook Of Electricity
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