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Posted By: Sra1 Member Level: Diamond Posted Date: 27 May 2008
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2007 Jawaharlal Nehru Technological University B.Tech Electronics & Communications Engineering ELECTRONIC MEASUREMENTS AND INSTRUMENTATION (Supplimentary Examinations, Aug/Sep 2007) Question paper
Set No 1
--------------------
Time: 3 hours Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks
1. (a) What is meant by circuit loading when measurements are made in electronic circuits lab, indicate steps to avoid the same.
(b) Is it necessary that every digital voltmeter should have a high input impedance? Give reasons.
(c) How are digital voltmeters are classified? Explain with examples. [3+6+7]
2. (a) Discuss the bridge which is used for the precision measurement of capacitors and their insulating properties. How does the balancing conditions help in finding the reactance of the unknown component and its dissipation factor.
(b) A bridge has 2000 ohm in one arm and its opposite arm has a capacitor of value 0.5µF The arm to the right of resistor arm is having 1000 ohm in shunt with a 0.5 µF The arm opposite to this arm is connected with the unknown component. Find the value of the component and its dissipation factor. [8+8]
3. (a) Why is Wagner’s additional ground connection made?
(b) Why does not this connection affect the balance conditions?
(c) What are problems associated with shielding? How they are handled.[5+5+6]
4. (a) Explain briefly about frequency synthesizer using PLL.
(b) What is a comparator? Explain how it is used in frequency measurement? [8+8]
5. Describe the following:
(a) Sources of Synchronisation.
(b) Blanking circuit
(c) Focus control. [6+5+5]
6. (a) Explain the two types of Spectrum Analyzers. [2x3=6]
(b) Explain the following terms associated with Spectrum Analyzer. [3x2=6]
i. Sensitivity
ii. Dynamic Range
iii. Harmonic Mixing
(c) Compare the selectivity characteristics of the Spectrum Analyzer and Wave
Analyzer. [4]
7. (a) Show and explain the capacitive transducer arrangement to measure angular velocity and what are its limitations? [2+4+2=8]
(b) What are the disadvantages of capacitive transducers? [4]
(c) What are the uses of capacitive transducers? [4]
8. (a) With neat sketches and suitable equations explain the working of a capacitive transducer?
(b) Explain the operation of a potentiometric transducer. [8+8]
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