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

3-phase induction motor : Efficiency=90%=0.9 power factor=80%=0.8 Input=50Hp,440V To find: Starting…

Answered: A 50 HP, 440 volts, 3-phase induction…

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

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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

A 50 HP, 440 volts, 3-phase induction motor delivers during the starting period of 150% of the
normal torque and draws 550% of rated current with the rated voltage. The full load pf and full
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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