A 50 HP, 440 volts, 3-phase induction motor delivers during starting period 150% of the normal torque and draws 550% of the rated current with the rated voltage. The full load pf and full load efficiency are 80% and 90% respectively. If the starting torque of the load is only 50% of the rated torque of the motor and an auto transformer is used as starting unit, what should be the starting current at this voltage? A. 125 amp B. 130 amp C. 180 amp D. 254 amp
A 50 HP, 440 volts, 3-phase induction motor delivers during starting period 150% of the normal torque and draws 550% of the rated current with the rated voltage. The full load pf and full load efficiency are 80% and 90% respectively. If the starting torque of the load is only 50% of the rated torque of the motor and an auto transformer is used as starting unit, what should be the starting current at this voltage? A. 125 amp B. 130 amp C. 180 amp D. 254 amp
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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A 50 HP, 440 volts, 3-phase induction motor delivers during starting period 150% of the normal torque and draws 550% of the rated current with the rated voltage. The full load pf and full load efficiency are 80% and 90% respectively. If the starting torque of the load is only 50% of the rated torque of the motor and an auto transformer is used as starting unit, what should be the starting current at this voltage?
A. 125 amp
B. 130 amp
C. 180 amp
D. 254 amp
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