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Reg No.: Name:

APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY
Fifth semester B.Tech degree examinations (S) September 2020

Course Code: AE303

Course Name: ELECTRICAL MEASUREMENTS AND MEASURING INSTRUMENTS

Max. Marks: 100

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PARTA
Answer any two full questions, each carries 15 marks.
Explain loading effect.
Briefly explain the classification of different types of errors in a measurement
systems.
Compare accuracy and precision.
Explain the operation of a rectifier type voltmeter.
Differentiate primary and secondary standards.
Sketch the basic construction of a typical permanent magnet moving coil
instrument and explain its operation.
Give the basic principle of electrostatic instruments. With the aid of a neat
diagram explain the working of a quadrant type electrostatic voltmeter.
PART ‏تا‎
‎Answer any two full questions, each carries 15 marks.
Explain the principle of operation of a Carey Foster Slide Wire Bridge.
Draw the Thevenin equivalent circuit of a Wheatstone bridge as seen from the
galvanometer. Derive the equation for galvanometer current.
Derive the general equation for an AC bridge at balance.
Differentiate coordinate and polar type AC potentiometers.
Describe a Kelvin’s bridge stating its advantage.
Explain the working of a Schering’s bridge with circuit diagram.
PART ட
Answer any two full questions, each carries 20 marks.
With a neat block diagram, explain the working of a digital storage oscilloscope.
Explain the oscilloscopic techniques to determine frequency and phase angle

measurement.

Duration: 3 Hours

Marks

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