MICROLEECTRONIC E BOOKS
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ISBN: 9780190853532
Author: SEDRA
Publisher: OXF
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Chapter 5, Problem 5.41P
To determine
The values of threshold voltage
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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]
Tests are carried on 400 V, 60 Hz, Y-connected, wound rotor three-phase induction motor with
the following test results:
DC Test: 21 V, 43 A
No Load Test: 400 V, 20 A, 1200 W, 60 Hz
Blocked Rotor Test: 100 V, 44 A, 2700 W, 19 Hz
Find R1, X1, R2, X2, and Xm of this motor?
xxx₁ = 0.5xbm fy
Pen Pd
51-5
NN (1-5)
1208
1 [10Marks]
N
wr
P
5- A 250 V shunt motor operates on full load at 1500 rpm and draws line current 20 A.
The armature has 6 poles and is lap wound with 200 turns. Find the induced emf and the
flux/pole at full load. Given that the armature and field resistances are 0.5 and 125 2
respectively. Ans.[ 24.1 m Wb]
Chapter 5 Solutions
MICROLEECTRONIC E BOOKS
Ch. 5.1 - Prob. 5.1ECh. 5.1 - Prob. D5.3ECh. 5.2 - Prob. 5.4ECh. 5.2 - Prob. 5.5ECh. 5.3 - Prob. D5.9ECh. 5.3 - Prob. D5.10ECh. 5.3 - Prob. 5.11ECh. 5.3 - Prob. 5.12ECh. 5.3 - Prob. D5.13ECh. 5.3 - Prob. D5.14E
Ch. 5.3 - Prob. 5.15ECh. 5.4 - Prob. 5.16ECh. 5.4 - Prob. 5.17ECh. 5 - Prob. 5.1PCh. 5 - Prob. 5.2PCh. 5 - Prob. 5.3PCh. 5 - Prob. 5.4PCh. 5 - Prob. 5.8PCh. 5 - Prob. 5.9PCh. 5 - Prob. 5.15PCh. 5 - Prob. 5.17PCh. 5 - Prob. D5.19PCh. 5 - Prob. 5.21PCh. 5 - Prob. 5.22PCh. 5 - Prob. 5.23PCh. 5 - Prob. 5.24PCh. 5 - Prob. 5.25PCh. 5 - Prob. 5.26PCh. 5 - Prob. 5.27PCh. 5 - Prob. 5.34PCh. 5 - Prob. 5.39PCh. 5 - Prob. 5.41PCh. 5 - Prob. 5.42PCh. 5 - Prob. 5.51PCh. 5 - Prob. D5.52PCh. 5 - Prob. 5.53PCh. 5 - Prob. 5.57PCh. 5 - Prob. 5.66PCh. 5 - Prob. 5.67P
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