A 55 hp, 440 V, 400 rpm DC shunt motor draws 107 A when operating at rated conditions. The motor has an armature-circuit resistance of 100 mW and a total field-circuit resistance of 55 W. Answer the following and explain why you chose that answer. (i) What is the motor armature current? 99 A 102 A 107 A 110 A 115 A
A 55 hp, 440 V, 400 rpm DC shunt motor draws 107 A when operating at rated conditions. The motor has an armature-circuit resistance of 100 mW and a total field-circuit resistance of 55 W. Answer the following and explain why you chose that answer. (i) What is the motor armature current? 99 A 102 A 107 A 110 A 115 A
Delmar's Standard Textbook Of Electricity
7th Edition
ISBN:9781337900348
Author:Stephen L. Herman
Publisher:Stephen L. Herman
Chapter5: Resistors
Section: Chapter Questions
Problem 1PA
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A 55 hp, 440 V, 400 rpm DC shunt motor draws 107 A when operating at rated conditions. The motor has an armature-circuit resistance of 100 mW and a total field-circuit resistance of 55 W.
Answer the following and explain why you chose that answer.
(i) What is the motor armature current?
- 99 A
- 102 A
- 107 A
- 110 A
- 115 A
(ii) What is the CEMF developed in the armature?
- 9 V
- 0 V
- 1 V
- 3 V
- 5 V
(iii) What is the total windings (copper) losses in the motor?
- 5 W
- 1 W
- 0 W
- 1145 W
- 1 W
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