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Electrical Engineering

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Delmar's Standard Textbook Of Electricity

7th Edition

ISBN:9781337900348

Author:Stephen L. Herman

Publisher:Stephen L. Herman

Chapter30: Dc Motors

Section: Chapter Questions

Problem 6RQ: What is CEMF?

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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

QI:A: Design a multi-range ammeter of 0.5 and 1 Amp. using a PMMC(galvanometer) of 500 internal resistance and full-scale current of 1 ma. Show the way of connection with the load R.

1%Vo l.
Exam practically 2n..
Middle Technical University
Electrical Engineering Technical
College
Department of control Eng. Tech.
Subject: practical Instr.
Stage: 2 stage
Date: 5/ 3/2021
Lecturer: nabil
Time: 2 hours
2020-2021
Answer All Questions:
QI:A: Design a multi-range ammeter of 0.5 and 1 Amp. using a PMMC(galvanometer) of
500 internal resistance and full-scale current of 1 ma. Show the way of connection with the
load RL.
B: What are the things that must be taken into consideration practically when using the
ammeter.
Q2: Design series ohmmeter using PMMC of 1000 internal resistance and 0.4ma full-scale
deflection current. The required half-scale deflection is equal to 9k0.Juse a battery of 9v].
Sketch the internal circuit diagram of the ohmmeter. Sketch also roughly the scale of the
designed meter.
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