A 300 V, d.c. shunt motor runs at a speed of 800 rpm when driving a constant-torque load. The armature resistance is 0.5 2 and the field resistance is adjusted to give 3A in the field circuit. Under certain load condition the motor draws a line current of 20 A. (a) Calculate the resistance that must be added to the armature circuit to reduce the speed of the motor to 400 rpm. (b) What is the value of the additional resistance that must be inserted in the armature circuit to make the motor operates in the stalling condition?
A 300 V, d.c. shunt motor runs at a speed of 800 rpm when driving a constant-torque load. The armature resistance is 0.5 2 and the field resistance is adjusted to give 3A in the field circuit. Under certain load condition the motor draws a line current of 20 A. (a) Calculate the resistance that must be added to the armature circuit to reduce the speed of the motor to 400 rpm. (b) What is the value of the additional resistance that must be inserted in the armature circuit to make the motor operates in the stalling condition?
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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