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6. The load test method for d-e machines which requires that both the motor and the generator be electrically and mechanically connected together is the A. direct-load test method. B. mechanical input test method. C. electrical input test method. D. loading-back test method. 7. When a motor is tested with a prony brake, the scale reading is 3.50 lb. The length of the brake arm is 12 in. and its weight is 0.50 lb. If the motor speed is 1700 rpm and the power input is 1050 watts, the motor efficiency is A. 64.5% B. 69% C. 80.5% D. 75%. 8. When machine losses are determined by the retardation method, it is necessary to know the machine's A. resistance. B. ventilation requirements. C. moment of inertia. D. electrical input. on hy

6. The load test method for d-e machines which requires that both the motor and the generator be electrically and mechanically connected together is the A. direct-load test method. B. mechanical input test method. C. electrical input test method. D. loading-back test method. 7. When a motor is tested with a prony brake, the scale reading is 3.50 lb. The length of the brake arm is 12 in. and its weight is 0.50 lb. If the motor speed is 1700 rpm and the power input is 1050 watts, the motor efficiency is A. 64.5% B. 69% C. 80.5% D. 75%. 8. When machine losses are determined by the retardation method, it is necessary to know the machine's A. resistance. B. ventilation requirements. C. moment of inertia. D. electrical input. on hy

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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#6,#7,#8
6. The load test method for d-e machines which requires that both the motor and the generator be electrically and mechanically connected together is the A. direct-load test method. B. mechanical input test method. C. electrical input test method. D. loading-back test method. 7. When a motor is tested with a prony brake, the scale reading is 3.50 lb. The length of the brake arm is 12 in. and its weight is 0.50 lb. If the motor speed is 1700 rpm and the power input is 1050 watts, the motor efficiency is A. 64.5% B. 69% C. 80.5% D. 75%. 8. When machine losses are determined by the retardation method, it is necessary to know the machine's A. resistance. B. ventilation requirements. C. moment of inertia. D. electrical input. 9. Which one of the following d-c machine losses is determined by applying a standard value rather than by measurement? A. Stray-load loss B. Friction and windage loss C. Core loss D. Copper loss must be determined. When running the test, you should make sure
Transcribed Image Text:6. The load test method for d-e machines which requires that both the motor and the generator be electrically and mechanically connected together is the A. direct-load test method. B. mechanical input test method. C. electrical input test method. D. loading-back test method. 7. When a motor is tested with a prony brake, the scale reading is 3.50 lb. The length of the brake arm is 12 in. and its weight is 0.50 lb. If the motor speed is 1700 rpm and the power input is 1050 watts, the motor efficiency is A. 64.5% B. 69% C. 80.5% D. 75%. 8. When machine losses are determined by the retardation method, it is necessary to know the machine's A. resistance. B. ventilation requirements. C. moment of inertia. D. electrical input. 9. Which one of the following d-c machine losses is determined by applying a standard value rather than by measurement? A. Stray-load loss B. Friction and windage loss C. Core loss D. Copper loss must be determined. When running the test, you should make sure
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