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• A 120-V, 2400-rpm shunt motor has an armature resistance of 0.4 2 and a shunt field resistance of 160 2. The motor operates at its rated speed at full load and takes 14.75 A. The no-load current is 2 A. An external resistance of 80 Q is inserted in series with the shunt field winding instead of the armature circuit, determine (a) the motor speed, (2907 rpm) (b) the power loss in the external resistance, and (20 W) (c) the efficiency. (84.8%) • Assume that the flux is proportional to the square root of the field-winding current and the motor develops the same torque.

• A 120-V, 2400-rpm shunt motor has an armature resistance of 0.4 2 and a shunt field resistance of 160 2. The motor operates at its rated speed at full load and takes 14.75 A. The no-load current is 2 A. An external resistance of 80 Q is inserted in series with the shunt field winding instead of the armature circuit, determine (a) the motor speed, (2907 rpm) (b) the power loss in the external resistance, and (20 W) (c) the efficiency. (84.8%) • Assume that the flux is proportional to the square root of the field-winding current and the motor develops the same torque.

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 120-V, 2400-rpm shunt motor has an armature resistance of 0.4 2 and a shunt field resistance of 160 2. The motor operates at its rated speed at full load and takes 14.75 A. The no-load current is 2 A. An external resistance of 80 Q is inserted in series with the shunt field winding instead of the armature circuit, determine (a) the motor speed, (2907 rpm) (b) the power loss in the external resistance, and (20 W) (c) the efficiency. (84.8%) • Assume that the flux is proportional to the square root of the field-winding current and the motor develops the same torque.
Transcribed Image Text:• A 120-V, 2400-rpm shunt motor has an armature resistance of 0.4 2 and a shunt field resistance of 160 2. The motor operates at its rated speed at full load and takes 14.75 A. The no-load current is 2 A. An external resistance of 80 Q is inserted in series with the shunt field winding instead of the armature circuit, determine (a) the motor speed, (2907 rpm) (b) the power loss in the external resistance, and (20 W) (c) the efficiency. (84.8%) • Assume that the flux is proportional to the square root of the field-winding current and the motor develops the same torque.
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