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A shunt motor by means of a prony brake having a length arm of 3.5 feet and a tare weight of 5.7 lbs. The current draw by the machine from a 240 V line was 50.9 A when the scale reading was 24 lbs and the speed of the motor was 1,215 rpm. Calculate the rotational losses of the motor. The armature and shunt field resistances of the machine are 0.25 ohm and 120 ohms, respectively.

A shunt motor by means of a prony brake having a length arm of 3.5 feet and a tare weight of 5.7 lbs. The current draw by the machine from a 240 V line was 50.9 A when the scale reading was 24 lbs and the speed of the motor was 1,215 rpm. Calculate the rotational losses of the motor. The armature and shunt field resistances of the machine are 0.25 ohm and 120 ohms, respectively.

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
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A shunt motor by means of a prony brake having a length arm of 3.5 feet and a tare weight of 5.7 lbs. The current draw by the machine from a 240 V line was 50.9 A when the scale reading was 24 Ibs and the speed of the motor was 1,215 rpm. Calculate the rotational losses of the motor. The armature and shunt field resistances of the machine are 0.25 ohm and 120 ohms, respectively.
Transcribed Image Text:A shunt motor by means of a prony brake having a length arm of 3.5 feet and a tare weight of 5.7 lbs. The current draw by the machine from a 240 V line was 50.9 A when the scale reading was 24 Ibs and the speed of the motor was 1,215 rpm. Calculate the rotational losses of the motor. The armature and shunt field resistances of the machine are 0.25 ohm and 120 ohms, respectively.
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