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Posted By: Nitin Bajaj - Editor Member Level: Diamond Posted Date: 14 Apr 2008
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2007 Jawaharlal Nehru Technological University B.Tech Applied Electronics and Instrumentation ELECTRICAL AND ELECTRONICS MEASUREMENTS (Instrumentation & Control Engineering) Question paper
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II B.Tech I Semester Regular Examinations, November 2007 ELECTRICAL AND ELECTRONICS MEASUREMENTS (Instrumentation & Control Engineering) Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ?????
1. Explain in detail the Permanent magnet moving coil mechanism with construction and temperature compensation. [8+4+4]
2. (a) Explain in detail the measurement of power using electrodynamometer. (b) Write short notes on watt-hour meter. [8+8]
3. (a) Give the schematic diagram of a balanced bridge DC ampli?er used in electronic analog voltmeters and explain its working. (b) What would true RMS reading meter indicate if a pulse wave from of 5 volts peak and a 25% duty cycle applied? What would the meter indicate if a 5volt DC input were applied (assume the meter has DC capability). [8+8]
4. (a) What do you understand by Q of an inductor, explain with reference to series resonant circuit? (b) Give one method of measurement of Q of a coil. [8+8]
5. (a) With neat circuit diagram, explain the function of associated circuits that are used for CRT operation. (b) Explain how the light is emitted on the screen of a CRO.
6. (a) What is oscilloscope probe compensation? How is this adjusted? (b) How does the digital storage oscilloscope di?er from the conventional storage oscilloscope using a storage cathode ray tube? [8+8]
7. (a) Mention di?erent types of signal generators and explain their working principles. (b) Explain in detail about conventional standard signal generator. [10+6] [10+6]
8. (a) What minimum gate time is required for a frequency counter capable of measuring an unknown frequency, to within 10 Hz, by measuring frequency rather than period? Justify your answer. (b) Explain the display technique used frequency counters, with an example.[8+8]
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