Reg No.:_ Name:

FOURTH SEMESTER B.TECH DEGREE EXAMINATION(S), DECEMBER 2019

Max. Marks: 100

10

11 a)
b)

12
13

D192079 Pages:2

APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY

Course Code: EE208
Course Name: MEASUREMENTS AND INSTRUMENTATION

PARTA

Answer all questions, each carries 5 marks
What are the different methods of obtaining the controlling torque in an
indicating instrument?
What is meant by creeping? What are the causes of creeping and how it can be
eliminated?
Define the following terms of an instrument transformer? (i) Burden (ii) Nominal
ratio
Explain how BH curve can be determined using Ballistic galvanometer?

Explain the working of a Vernier potentiometer?.

What is Maxwell’s bridge? Derive the equation of balance for the bridge?.
What are primary and secondary transducers?
Discuss the working of a load cell?
PART ‏تا‎
‎Answer any two questions, each carries 10 marks
Explain the construction and principle of operation of Permanent Magnet
Moving Coil Instrument? Derive it’s torque equation?
Explain the construction and working principle of an induction type energy
meter. Show that number of revolutions of the disc in induction type energy
meter is proportional to energy consumed?
Explain the general requirements for ammeter shunts.
Explain any two errors that occur in electrodynamometer type wattmeter and its
compensation?
PART C
Answer any two questions, each carries 10 marks
Derive the expression for Ratio and Phase angle error in a Current Transformer?

What do you mean by Lloyd -Fisher square? How it can be used for

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Duration: 3 Hours

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