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1. A 100-V shunt motor is developing 6 bg while operating at an overall efficiency of 86%. The armature and shunt field resistances are 0.06 and 50 ohms respectively. Determine the stray power losses.

1. A 100-V shunt motor is developing 6 bg while operating at an overall efficiency of 86%. The armature and shunt field resistances are 0.06 and 50 ohms respectively. Determine the stray power losses.

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
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Topic: Efficiency and Testing of DC machines

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1. A 100-V shunt motor is developing 6 bg while operating at an overall efficiency of 86%. The armature and shunt field resistances are 0.06 and 50 ohms respectively. Determine the stray power losses. 2. The field and armature resistance of a 400 v shunt motor are 200 n and 0.10, respectively. The motor takes 30 A of current while running at 1000 rpm. If the frictional losses are 400w, determine the motor efficiency. 3. In a brake test of an elevator door, the ammeter and voltmeter measuring the input read 34 A at 220 V. The speed of the motor is found to be 910 rpm and the balance on the 0.61m brake arm reads 11.9kg. The dead weight of the arm is found to be 1.09 kg. What is the bRoutput of the motor?
Transcribed Image Text:1. A 100-V shunt motor is developing 6 bg while operating at an overall efficiency of 86%. The armature and shunt field resistances are 0.06 and 50 ohms respectively. Determine the stray power losses. 2. The field and armature resistance of a 400 v shunt motor are 200 n and 0.10, respectively. The motor takes 30 A of current while running at 1000 rpm. If the frictional losses are 400w, determine the motor efficiency. 3. In a brake test of an elevator door, the ammeter and voltmeter measuring the input read 34 A at 220 V. The speed of the motor is found to be 910 rpm and the balance on the 0.61m brake arm reads 11.9kg. The dead weight of the arm is found to be 1.09 kg. What is the bRoutput of the motor?
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