The armature resistance of 250 V DC shunt motor is 0.5 ohm. Its armature current is 20 A when running at 1200 rpm and develops full-load torque. What resistance must be inserted in series with the armature to reduce the speed to 600 rpm at the same torque, and what will be the speed if the load torque is halved
The armature resistance of 250 V DC shunt motor is 0.5 ohm. Its armature current is 20 A when running at 1200 rpm and develops full-load torque. What resistance must be inserted in series with the armature to reduce the speed to 600 rpm at the same torque, and what will be the speed if the load torque is halved
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
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![The armature resistance of 250 V DC
shunt motor is 0.5 ohm. Its armature
current is 20 A when running at 1200 rpm
and develops full-load torque. What
resistance must be inserted in series with
the armature to reduce the speed to 600
rpm at the same torque, and what will be
the speed if the load torque is halved
with this resistance in the circuit. Assume
the flux to remain constant throughout
and neglect brush contact drop. *](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F534cc262-246f-421a-b8f4-513715fe8519%2F22ffcdc1-1161-4062-931e-f409c3415512%2F583v3va_processed.jpeg&w=3840&q=75)
Transcribed Image Text:The armature resistance of 250 V DC
shunt motor is 0.5 ohm. Its armature
current is 20 A when running at 1200 rpm
and develops full-load torque. What
resistance must be inserted in series with
the armature to reduce the speed to 600
rpm at the same torque, and what will be
the speed if the load torque is halved
with this resistance in the circuit. Assume
the flux to remain constant throughout
and neglect brush contact drop. *
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