Answered: 5. A 3Φ, 1385.6 v, star-connected…

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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5. A 3Φ, 1385.6 v, star-connected synchronous motor, having synchronous reactance of 2
Ω/phase and negligible resistance takes an input of 207.84 kW with an induced emf of
916.5 volts/phase. Calculate the motor line current and pf. Draw the vector diagram
ANSWER: [100 A; 0.866 lead]

6. A synchronous motor has an equivalent armature reactance of 3.3 Ω. The exciting current is
adjusted to such a value that the generated emf is 950 V. Find the power factor at which the
motor would operated when taking 80 kW from a 800-V supply mains.

ANSWER: [0.965 lead]

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