A 500 V shunt motor running at 720 rpm takes an armature current of 50 A. The equivalent armature resistance is 0.4 ohm. What resistance must be placed in series with the armature to reduce the speed to 540 rpm while maintaining the same torque?
A 500 V shunt motor running at 720 rpm takes an armature current of 50 A. The equivalent armature resistance is 0.4 ohm. What resistance must be placed in series with the armature to reduce the speed to 540 rpm while maintaining the same torque?
Delmar's Standard Textbook Of Electricity
7th Edition
ISBN:9781337900348
Author:Stephen L. Herman
Publisher:Stephen L. Herman
Chapter7: Parallel Circuits
Section: Chapter Questions
Problem 4PP: Using the rules for parallel circuits and Ohmslaw, solve for the missing values....
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Question
A 500 V shunt motor running at 720 rpm takes an armature current of 50 A. The equivalent armature resistance is 0.4 ohm. What resistance must be placed in series with the armature to reduce the speed to 540 rpm while maintaining the same torque?
![A) A.2.2 ohms
B) B. 2.6 ohms
(c) C. 2.4 ohms
D. 2.8 ohms](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fe0550107-d1d5-4a31-ad59-9f1cdcaee104%2F5d77d3e9-30b0-4094-a81e-af6537815de5%2F39q4zmq_processed.jpeg&w=3840&q=75)
Transcribed Image Text:A) A.2.2 ohms
B) B. 2.6 ohms
(c) C. 2.4 ohms
D. 2.8 ohms
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