A shunt motor operates at a flux of 25 mWb per pole, is lap wound and has 2 poles and 360 conductors. The armature resistance is 0.12 ohm and the motor is designed to operate at 115 volts, taking 60 A in armature current at full load. The external resistance inserted in the armature circuit so that the armature current shall not exceed twice its full load value at starting. When the motor has reached a speed of 400 rpm, the external resistance is cut by 50%, what is the armature current, at this speed. A. 102A B. 167A I C. 213 A D. 184A

A shunt motor operates at a flux of 25 mWb per pole, is lap wound and has 2 poles and 360 conductors. The armature resistance is 0.12 ohm and the motor is designed to operate at 115 volts, taking 60 A in armature current at full load. The external resistance inserted in the armature circuit so that the armature current shall not exceed twice its full load value at starting. When the motor has reached a speed of 400 rpm, the external resistance is cut by 50%, what is the armature current, at this speed. A. 102A B. 167A I C. 213 A D. 184A

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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Concept explainers

DC Generator

An electromechanical machine which converts input mechanical energy to respective output electric energy is called a generator.

Question

5. A shunt motor operates at a flux of 25 mWb per pole, is lap wound and has 2
poles and 360 conductors. The armature resistance is 0.12 ohm and the motor
is designed to operate at 115 volts, taking 60 A in armature current at full load.
The external resistance inserted in the armature circuit so that the armature
current shall not exceed twice its full load value at starting. When the motor
has reached a speed of 400 rpm, the external resistance is cut by 50%, what
is the armature current, at this speed.
A. 102A
B. 167A
I
C. 213 A
D. 184A

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