Looking for B.Tech JNTUA 1st semester 9A02501 - Electrical and Electronic Measurements 2012 question paper? Look below to collect all contents in text format for this 9A02501 - Electrical and Electronic Measurements question paper.
Jawaharlal Nehru Technlogical University , Anantapur
B.Tech Supplementary Examination , May 2012
Third Year
First Semester
Department of Electrical and Electronics Engineering
9A02501 - Electrical and Electronic Measurements
(Regulation 2009)
Code: 9A02501
B.Tech III Year I Semester (R09) Supplementary Examinations, May 2012
ELECTRICAL AND ELECTRONIC MEASUREMENTS
(Electrical and Electronics Engineering)
Time: 3 hours Max Marks: 70
Answer any FIVE questions
All questions carry equal marks
1 (a) Describe the construction details of an attraction type moving iron instrument with the help of a diagram. Derive the equation for deflection of spring control used.
(b) Describe the construction details and working of electrodynamometer type instrument. Derive the equation for deflection under a.c operation.
2 (a) Draw the equivalent circuit and phasor diagram of a current transformer. Derive the expressions for ratio and phase angle errors.
(b) Describe the errors in electrodynamometer type wattmeter.
3 (a) Derive the expression for deflecting torque in single phase induction type meters.
(b) Describe a current for testing of a single phase induction type energy meter at different loads and power factors.
4 (a) Describe the basic principle of operation of a d.c potentiometer. Explain why potentiometer does not load the voltage source whose voltage is being determined.
(b) Explain how true zero is obtained Crompton’s potentiometer.
5 (a) Draw the circuit of a Kelvin double bridge used for measurement of low resistance. Derive the condition for balance.
(b) Derive the equations for balance in the case of Maxwell’s bridge.
6 (a) Describe a method of experimental determination of flux density in a specimen of magnetic material using Ballistic galvanometer.
(b) Describe the method of determining B-H curve of a magnetic material using method of reversals.
7 (a) Describe how the following parameters can be made with the use of a CRO.
(i) Frequency. (ii) Phase angle.
(b) Describe the details of vertical amplifier used in a CRO.
8 (a) Explain in detail about successive approximation type DVM.
(b) Describe in detail about digital tachometer.
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