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A 220 V DC series motor draws full-load line current of 38 A at the rated speed of 500 rpm. The series field and armature resistance of the motor is 0.2 ohm and 0.4 ohm respectively. Considering brush drop as 3.0 V irrespective of the load and neglecting armature reaction, find: (i) The speed of the motor when the load current drops to 19 A (ii) The speed on removal of load when the motor takes only 1A from supply. (iii) The internal horse power developed in each of the above cases.

A 220 V DC series motor draws full-load line current of 38 A at the rated speed of 500 rpm. The series field and armature resistance of the motor is 0.2 ohm and 0.4 ohm respectively. Considering brush drop as 3.0 V irrespective of the load and neglecting armature reaction, find: (i) The speed of the motor when the load current drops to 19 A (ii) The speed on removal of load when the motor takes only 1A from supply. (iii) The internal horse power developed in each of the above cases.

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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A 220 V DC series motor draws full-load line current of 38 A at the rated speed of 500 rpm. The series field and armature resistance of the motor is O.2 ohm and 0.4 ohm respectively. Considering brush drop as 3.0 V irrespective of the load and neglecting armature reaction, find: (i) The speed of the motor when the load current drops to 19 A (ii) The speed on removal of load when the motor takes only 1A from supply. (iii) The internal horse power developed in each of the above cases. *
Transcribed Image Text:A 220 V DC series motor draws full-load line current of 38 A at the rated speed of 500 rpm. The series field and armature resistance of the motor is O.2 ohm and 0.4 ohm respectively. Considering brush drop as 3.0 V irrespective of the load and neglecting armature reaction, find: (i) The speed of the motor when the load current drops to 19 A (ii) The speed on removal of load when the motor takes only 1A from supply. (iii) The internal horse power developed in each of the above cases. *
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