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An electrical load of 250Kva has a pf of 0.65 inductive. Connects to the same network a 75kW star synchronous motor, with 88% efficiency, to raise the pf of the installation at 0.85 inductive. a) Calculate the apparent pf of the synchronous motor and the pf at which it will work. b) If the supply voltage is 380V, and the motor has a synchronous impedance of j0.5 ohms per phase determine the induced emf of the machine.

An electrical load of 250Kva has a pf of 0.65 inductive. Connects to the same network a 75kW star synchronous motor, with 88% efficiency, to raise the pf of the installation at 0.85 inductive. a) Calculate the apparent pf of the synchronous motor and the pf at which it will work. b) If the supply voltage is 380V, and the motor has a synchronous impedance of j0.5 ohms per phase determine the induced emf of the machine.

Introductory Circuit Analysis (13th Edition)
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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An electrical load of 250Kva has a pf of 0.65 inductive. Connects to the same network a 75kW star synchronous motor, with 88% efficiency, to raise the pf of the installation at 0.85 inductive.
a) Calculate the apparent pf of the synchronous motor and the pf at which it will work.
b) If the supply voltage is 380V, and the motor has a synchronous impedance
of j0.5 ohms per phase determine the induced emf of the machine.

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