300-hp three phase squirrel-cage induction motor. The supply voltage is 480 V. The power has determined that the maximum amount of starting current that can be permitted by any motor in the plant is 3000 Amp Phase: 3 FLA: 352 Volts: 480 RPM: 1755 Frame: Code: L

300-hp three phase squirrel-cage induction motor. The supply voltage is 480 V. The power has determined that the maximum amount of starting current that can be permitted by any motor in the plant is 3000 Amp Phase: 3 FLA: 352 Volts: 480 RPM: 1755 Frame: Code: L

Delmar's Standard Textbook Of Electricity

7th Edition

ISBN:9781337900348

Author:Stephen L. Herman

Publisher:Stephen L. Herman

Chapter32: Three-phase Motors

Section: Chapter Questions

Problem 6RQ: Name three factors that determine the torque produced by an induction motor.

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Question

Phase: 3 FLA: 352

Volts: 480 RPM: 1755

Frame: Code: L

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A four-pole induction motor drives a load at 2478 rpm. This is to be accomplished by using an electronic converter to convert a 400-V dc source into a set of three-phase ac voltages. Part A Find the frequency required for the ac voltages assuming that the slip is 4 percent. The load requires 2 hp. Express your answer to three significant figures and include the appropriate units. f= Submit Part B Value I = HA Request Answer Submit If the dc-to-ac converter has a power efficiency of 90 percent and the motor has a power efficiency of 80 percent, estimate the current taken from the dc source. Express your answer to three significant figures and include the appropriate units. HÅ Value Units Request Answer ? Units ?
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If the supply voltage in a three-phase induction motor is reduced by 10%, what will be the percentage decrease in the maximum torque generated?
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Name three factors that determine the torque produced by an induction motor.
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7- Iron loss in the rotor of a 3-phase induction motor is negligible due to (a) Very low frequency of emf induced in the rotor (c) Very low flux density in rotor parts 8- The starting current of a 3-phase induction motor is about (a) Half (c) 5 to 7 times (b) Twice (d) 8 to 10 times 9- During plugging of an induction motor (a) Phase sequence is reversed (b) A de source is connected to stator (e) One phase is open circaited (d) Power is ied back to mains 10- Direct online (D.O.L.) starter is used for induction motors (a)Less than 5 h.p. (b) Less than 10 h.p. (c) Greater than 10 h.p. (d) For any capacity (b) Very low emf induced in the rotor (d) Constant magnitude of flux linking the rotor core of its full load rated current