H. W.: A 35 kW induction motor has power factor 0.9 and effliciency 0.9at full-load, power factor 0.6 and efficiency 0.7 at half full-load. At noload the current is 25% of full-load current and power factor is 0.I.Capacitors are supplied to make the line power factor 0.8 at half full-load. With these capacitors in circuit, find the line power factor at: (i) fullload, and (ii) no load.

The complex power in an AC system is defined as the product of rms value of applied voltage and…

H. W.: A 35 kW induction motor has power factor 0.9 and efficiency 0.9 at full-load, power factor 0.6 and efficiency 0.7 at half full-load. At no load the current is 25% of full-load current and power factor is 0.1. Capacitors are supplied to make the line power factor 0.8 at half full- load. With these capacitors in circuit, find the line power factor at: (i) full load, and (ii) no load.

H. W.: A 35 kW induction motor has power factor 0.9 and efficiency 0.9 at full-load, power factor 0.6 and efficiency 0.7 at half full-load. At no load the current is 25% of full-load current and power factor is 0.1. Capacitors are supplied to make the line power factor 0.8 at half full- load. With these capacitors in circuit, find the line power factor at: (i) full load, and (ii) no load.

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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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.

Question

H. W.: A 35 kW induction motor has power factor 0.9 and effliciency 0.9
at full-load, power factor 0.6 and efficiency 0.7 at half full-load. At no
load the current is 25% of full-load current and power factor is 0.I.
Capacitors are supplied to make the line power factor 0.8 at half full-
load. With these capacitors in circuit, find the line power factor at: (i) full
load, and (ii) no load.

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