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8-15. A 300-hp, 440-V, 560-A, 863 r/min shunt de motor has been tested, and the follow- ing data were taken: Blocked-rotor test: VA 14.9 V exclusive of brushes IA = 500 A No-load operation: VA = 440 V including brushes IA = 23.1 A VF = 440 V IF = 7.52 A IF = 7.50 A n = 863 r/min What is this motor's efficiency at the rated conditions? [Note: Assume that (1) the brush voltage drop is 2 V; (2) the core loss is to be determined at an armature volt- age equal to the armature voltage under full load; and (3) stray load losses are 1 per- cent of full load.]

8-15. A 300-hp, 440-V, 560-A, 863 r/min shunt de motor has been tested, and the follow- ing data were taken: Blocked-rotor test: VA 14.9 V exclusive of brushes IA = 500 A No-load operation: VA = 440 V including brushes IA = 23.1 A VF = 440 V IF = 7.52 A IF = 7.50 A n = 863 r/min What is this motor's efficiency at the rated conditions? [Note: Assume that (1) the brush voltage drop is 2 V; (2) the core loss is to be determined at an armature volt- age equal to the armature voltage under full load; and (3) stray load losses are 1 per- cent of full load.]

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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8-15. A 300-hp, 440-V, 560-A, 863 r/min shunt dc motor has been tested, and the follow- ing data were taken: Blocked-rotor test: VA 14.9 V exclusive of brushes IA = 500 A No-load operation: V₁ = 440 V including brushes IA = 23.1 A VF = 440 V IF = 7.52 A IF = 7.50 A n = 863 r/min What is this motor's efficiency at the rated conditions? [Note: Assume that (1) the brush voltage drop is 2 V; (2) the core loss is to be determined at an armature volt- age equal to the armature voltage under full load; and (3) stray load losses are 1 per- cent of full load.]
Transcribed Image Text:8-15. A 300-hp, 440-V, 560-A, 863 r/min shunt dc motor has been tested, and the follow- ing data were taken: Blocked-rotor test: VA 14.9 V exclusive of brushes IA = 500 A No-load operation: V₁ = 440 V including brushes IA = 23.1 A VF = 440 V IF = 7.52 A IF = 7.50 A n = 863 r/min What is this motor's efficiency at the rated conditions? [Note: Assume that (1) the brush voltage drop is 2 V; (2) the core loss is to be determined at an armature volt- age equal to the armature voltage under full load; and (3) stray load losses are 1 per- cent of full load.]
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