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Posted By: Sra1 Member Level: Gold 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
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Set No 3
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Time: 3 hours Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks
1. (a) Draw the block diagram of a successive approximation type of DVM with the help of neat schematic diagram.
(b) How is the time taken to complete one measurement cycle in case of a successive approximation A/D converter is estimated. Illustrate with neat logic diagram. [6+10]
2. The standard resistor arm of a Wheatstone bridge has a range from 0 to 100 ohm with a resolution of 0.001 ohm. The galvanometer has an internal resistance of 100 ohm and can be read to 0.5 µA. The other two arms have each 1 kohm. The bridge is supplied with a 10 V DC source. When the unknown resistance is 50 ohm, what is the resolution of the bridge in
(a) ohms and
(b) per cent of the unknown. [16]
3. (a) Discuss how a Q-meter can be employed to determine the distributed capacitance Cd of a coil.
(b) Compute the self-capacitance of a coil when the following measurements are made At f1 = 2 MHz the tuning capacitor is set at 450pF. When the frequency is increased to 5 MHz, the tuning capacitor is tuned to 60pF. [8+8]
4. (a) Explain briefly with a block diagram the operation of a temperature compensated crystal oscillator.
(b) Distinguish between asynchronous and synchronous counters. [8+8]
5. (a) Derive the equations for Resistive voltage divider and capacitive voltage divider of compensated attenuator .
(b) Explain the method of finding phase, frequency relationship of two waveforms using Lissajous figures.
(c) What are the advantages of using an active probe. [6+6+4]
6. (a) Draw the block diagram of a spectrum analyzer of the swept-receiver design and explain it. [4+6]
(b) Discuss the applications of Spectrum analyzer. [6]
7. (a) Explain how a load cell is employed to measure static and dynamic forces.
(b) Derive the expression for gauge factor for a strain guage. [8+8]
8. (a) What are the main characteristics of a high vacuum gauge? How are they used for measurement? [10]
(b) Enumerate the principles behind an inductive transducer. [6]
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