D1073 Pages: 2

Reg No.: Name:

Max. Marks: 100

ॐ ~ ॐ ~ ~+ ~ ‏تم‎

10

11

12

13

14

APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY
FOURTH SEMESTER B.TECH DEGREE EXAMINATION(R&S), MAY

2019
Course Code: EE208

Course Name: MEASUREMENTS AND INSTRUMENTATION (EE)
PARTA
Answer all questions, each carries 5 marks
The weight of 5g is used as control weight in a gravity controlled instrument. Find its
distance from the spindle, if the deflecting torque for a deflection of 60° is 1.13x 10°.
Explain the measurement of insulation resistance by loss of charge method.
How high voltage is tested using the method of sphere gaps?
Explain the measurement of flux in a ring specimen.
How frequency is measured using a Wien’s bridge?
Draw the diagram of a Cathode Ray Tube.
Explain the flow measurement using ultrasonic transducer.
Explain the working of piezoelectric transducer.
PART 8
Answer any two questions, each carries 10 marks
Explain the working of attraction type and repulsion type of moving iron instrument
with the help of neat diagrams
a) Explain any two errors that occur in electrodynamometer type wattmeter and its

compensation.
b) Explain the working of electronic energy meter.

a) Write short note on deflecting, damping and controlling torque
b) Write short note on 3 phase induction type energy meter
PART C
Answer any two questions, each carries 10 marks

Draw the phasor diagram of a current transformer. Derive the expressions for ratio
and phase angle errors.
a) How high voltage is measured using electrostatic voltmeter?

b) Explain the measurement of rotational speed by optical sensors.

What is a Lloyd- Fisher square? Explain the measurement of iron losses in a
magnetic material employing Lloyd-Fisher square using wattmeter method.

Page 1 of 2

Duration: 3 Hours

Marks

(5)

(5)
(5)
(5)
(5)
(5)
(5)
(5)

(10)
(5)

(5)
(5)
(5)

(10)

(5)
(5)
(10)