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A small permanent-magnet DC motor has an armature resistance of 3.5 2, and armatur voltage of 7 V, the motor achieved a no-load speed of 11, 500 r/min while drawing a armature current of 15 mA. Determine the motor torque constant K (V/(rad/sec)). a) 4.21 mV/(rad/sec) b) 5.77 mV/(rad/sec) c) 5.23 mV/(rad/sec) d) 8 mV/(rad/sec)

A small permanent-magnet DC motor has an armature resistance of 3.5 2, and armatur voltage of 7 V, the motor achieved a no-load speed of 11, 500 r/min while drawing a armature current of 15 mA. Determine the motor torque constant K (V/(rad/sec)). a) 4.21 mV/(rad/sec) b) 5.77 mV/(rad/sec) c) 5.23 mV/(rad/sec) d) 8 mV/(rad/sec)

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
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A small permanent-magnet DC motor has an armature resistance of 3.5 2, and armatur voltage of 7 V, the motor achieved a no-load speed of 11, 500 r/min while drawing a armature current of 15 mA. Determine the motor torque constant K (V/(rad/sec)). a) 4.21 mV/(rad/sec) b) 5.77 mV/(rad/sec) c) 5.23 mV/(rad/sec) d) 8 mV/(rad/sec)
Transcribed Image Text:A small permanent-magnet DC motor has an armature resistance of 3.5 2, and armatur voltage of 7 V, the motor achieved a no-load speed of 11, 500 r/min while drawing a armature current of 15 mA. Determine the motor torque constant K (V/(rad/sec)). a) 4.21 mV/(rad/sec) b) 5.77 mV/(rad/sec) c) 5.23 mV/(rad/sec) d) 8 mV/(rad/sec)
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