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14 • 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. When an external resistance of 3.6 Q is inserted in the armature circuit with no change in the torque developed, calculate the motor speed, the power loss in the external resistance, and the efficiency of the motor. Assume that the rotational loss is proportional to the speed. No = 146 250 Enfi F 2400

14 • 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. When an external resistance of 3.6 Q is inserted in the armature circuit with no change in the torque developed, calculate the motor speed, the power loss in the external resistance, and the efficiency of the motor. Assume that the rotational loss is proportional to the speed. No = 146 250 Enfi F 2400

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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14 • 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. When an external resistance of 3.6 Q is inserted in the armature circuit with no change in the torque developed, calculate the motor speed, the power loss in the external resistance, and the efficiency of the motor. Assume that the rotational loss is proportional to the speed. No = 146 250 Enfi F 2400
Transcribed Image Text:14 • 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. When an external resistance of 3.6 Q is inserted in the armature circuit with no change in the torque developed, calculate the motor speed, the power loss in the external resistance, and the efficiency of the motor. Assume that the rotational loss is proportional to the speed. No = 146 250 Enfi F 2400
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