An autotransformer is used to transform from 500 to 440 V. The load is 20 kVA, at unity pf. Neglecting losses and magnetizing current, find the current in the common winding. A. 85.45 A C. 10.45 A B. 40 A D. 5.45 A

An autotransformer is used to transform from 500 to 440 V. The load is 20 kVA, at unity pf. Neglecting losses and magnetizing current, find the current in the common winding. A. 85.45 A C. 10.45 A B. 40 A D. 5.45 A

Delmar's Standard Textbook Of Electricity

7th Edition

ISBN:9781337900348

Author:Stephen L. Herman

Publisher:Stephen L. Herman

Chapter23: Resistive-inductive-capacitive Series Circuits

Section: Chapter Questions

Problem 7PP: Is the power factor in Question 6 a leading or lagging power factor? Explain your answer.

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Concept explainers

Synchronous Motor

The synchronous motor is an AC electric type motor where at a steady-state the shaft rotation is synchronized with the supply current variable-frequency. To an integral number of AC cycles, the rotation period is exactly equal. The stator of the motor in the synchronous motor contains multi-phase AC electromagnets due to which a magnetic field is created that rotates in time with the oscillation of the line current. The rotor contains a permanent magnet and the rotor rotates in synchronization with the stator field at the same rate and provides the second synchronized magnetic field which is rotating in nature as a result. When the synchronous motor is supplied with independently excited multi-phase AC electromagnets on both the rotor and the stator, it is termed as a doubly-fed machine. The most widely used AC-type motors are the synchronous AC motor and the induction AC motors.

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65. An autotransformer is used to transform from 500 to 440 V. The load is 20 kVA, at unity pf. Neglecting losses and magnetizing current, find the current in the common winding. A. 85.45 A C. 10.45 A B. 40 A D. 5.45 A

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