Understanding Motor Controls
4th Edition
ISBN: 9781337798686
Author: Stephen L. Herman
Publisher: Delmar Cengage Learning
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Textbook Question
Chapter 37, Problem 15RQ
A 20 HP, three-phase squirrel cage induction motor has a NEMA code E. The motor is connected to 208 volts. What is the starting current for this motor?
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There is a 3 HP, 220 Vrms single - phase induction motor that operates with a 0.85
lagging power factor and 80 9% efficiency. What is the magnitude of the RMS motor
current?
O 75 Amps
15 Amps
O 5 Amps
O 3 Amps
The reason why the starting torque of a series motor is higher than a shunt motor is
because the series motor has
O more current flowing through its armature
O a stronger net magnetic field around both coils during the inrush of stator current
please answer quickly!!
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Understanding Motor Controls
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