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Prob. 12. A D.C. series motor runs at 500 r.p.m. drawing 40 A from 600 V supply. Determine the value of the external resistance to be added in serivr with the armature for the moter to run at 450 r.p.m. The load torque varies as the square of the speed. Assume linear magnetisation and take armature resistance as 0.3 ohm and series field resistance is 0.2 ohm.

Prob. 12. A D.C. series motor runs at 500 r.p.m. drawing 40 A from 600 V supply. Determine the value of the external resistance to be added in serivr with the armature for the moter to run at 450 r.p.m. The load torque varies as the square of the speed. Assume linear magnetisation and take armature resistance as 0.3 ohm and series field resistance is 0.2 ohm.

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...
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Prob. 12. A D.C. series motor runs at 500 r.p.m. drawing 40 A from 600 supply. Determine the value of the external resistance to be added in series with the armature for the motor to run at 450 r.p.m. The load torque vwries as the square of the speed. Assume linear magnetisation and take armature resistance as 0.3 ohm and series field resistance is 0.2 ohm.
Transcribed Image Text:Prob. 12. A D.C. series motor runs at 500 r.p.m. drawing 40 A from 600 supply. Determine the value of the external resistance to be added in series with the armature for the motor to run at 450 r.p.m. The load torque vwries as the square of the speed. Assume linear magnetisation and take armature resistance as 0.3 ohm and series field resistance is 0.2 ohm.
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