Dr.A.P.J.Abdul Kalam University Old Question Papers
Bachelor of Engineering
Third Semester Main Examination, Dec-2020
Electrical Measurements and Instrumentation [EX-221]
Branch: EX
Time: 3:00 Hrs Max Marks 70
Note : 1. Attempt any five questions out of eight.
2. All questions carry equal marks.
Q.1 (a) Define the terms:
(i) Accuracy (ii) Precision
(iii) Static sensitivity (iv) Reliability
(b) What do you mean by calibration curve? Explain loading effects due to shunt connected and
series connected instruments.
Q.2 (a) Explain the construction and working of D’arsonal Galvanometer.
(b) Expalin why PMMC instruments are the most widely used instruments. Discuss their
advantages and disadvantages.
Q.3 (a) Explain with the help of block diagram the working of Digital voltmeter.
(b) Write down the difference between current transformer and potential transformer. Also
explain their working.
Q.4 (a) Describe the constructional details and working of an electrodynamometer type of
wattmeter. Discuss the main sources of errors in electrodynamometer type instruments
(b) Explain the measurement of power using:
(i) Three wattmeter method
(ii) CTs and PTs
Q.5 (a) Explain the construction and operation of single phase and three phase electronic energy
meter.
(b) What is Phantom loading? Explain with example. Also describe the testing by phantom
loading for energy meters
Q.6 (a) Describe the circuit diagram of a series type ohm meter. Explain how is it designed. Why are
series type ohm meter preferred over shunt type ohm meters?
(b) What is a B-H curve in terms of magnetic material? Write down its characteristics?
Q.7 Write short notes on (any two):
(a) Lloyd fisher square method
(b) Economics of measurement system
(c) Kelvin’s double bridge
(d) Maximum demand meter
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