3. A 12020⁰ Vrms is to supply power to a welder, heater and an induction motor. A welder is a coil of (4+j3) ohm, the induction motor draws 60KW with 0.8 power factor, and the heater is a resistor that draws 15KW power. Find the complex power, real power, reactive power and the total power factor that must be supplied by source. If a capacitor will be used to supply a reactive power in the circuit in order that the net load will have a unity power factor, what reactive power must be supplied by the capacitor? Draw the circuit.

3. A 12020⁰ Vrms is to supply power to a welder, heater and an induction motor. A welder is a coil of (4+j3) ohm, the induction motor draws 60KW with 0.8 power factor, and the heater is a resistor that draws 15KW power. Find the complex power, real power, reactive power and the total power factor that must be supplied by source. If a capacitor will be used to supply a reactive power in the circuit in order that the net load will have a unity power factor, what reactive power must be supplied by the capacitor? Draw the circuit.

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

3. A 12020⁰ Vrms is to supply power to a welder, heater and an induction motor. A welder is a
coil of (4+j3) ohm, the induction motor draws 60KW with 0.8 power factor, and the heater is a
resistor that draws 15KW power. Find the complex power, real power, reactive power and the
total power factor that must be supplied by source.
If a capacitor will be used to supply a reactive power in the circuit in order that the net load will
have a unity power factor, what reactive power must be supplied by the capacitor? Draw the
circuit.

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