In two wattmeter method, if the load powerfactor is equal to 0.5, then W2 indicates thetotal power and W1 indicates zero.Select one:O TrueO False In a CRO screen, the time/cm control switchdetermines the vertical axis of the waveform.Select one:TrueO False

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Answered: In two wattmeter method, if the load…

In two wattmeter method, if the load power factor is equal to 0.5, then W2 indicates the total power and W1 indicates zero.

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 9RQ: What is the power factor of the circuit in Question 6?

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Concept explainers

Power Measurement

According to Blondel's theorem, the total power is measured with one less number of wattmeters than the number of wires present in the system. So, a single-phase and two-wire system will require one wattmeter and a single-phase and the three-wire system will require two wattmeters, and a three-phase and the three-wire system will also require two wattmeters and a three-phase and the four-wire system will require three wattmeter devices. The wattmeter is a device that measures power using one voltage and one current input as shown in the above figure. Multiple current or voltage input pair cables are used by many power analyzers and digital storage oscilloscopes (DSOs) for measuring watts, in effect within a single instrument acting as multiple wattmeters. It is possible to measure three-phase and four-wire power with one correctly specified power analyzer.

Question

In two wattmeter method, if the load power
factor is equal to 0.5, then W2 indicates the
total power and W1 indicates zero.
Select one:
O True
O False

In a CRO screen, the time/cm control switch
determines the vertical axis of the waveform.
Select one:
True
O False

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