VTU Electronics and Communication Engineering (Semester 3)
Electronic Instrumentation
June 2014
Total marks: --
Total time: --
INSTRUCTIONS
(1) Assume appropriate data and state your reasons
(2) Marks are given to the right of every question
(3) Draw neat diagrams wherever necessary


1 (a) Explain with a neat block diagram of TRUE RMS voltmeters.
10 M
1 (b) Convert a basic D'Arsonval movement with an internal resistance of 50Ω and a full scale deflection current of 2mA into a multi range DC voltmeter with voltage range of 0-10V, 0-50V, 0-100V and 0-250V. Connect the multiplier resistance in series with D'Arsonval movement.
10 M

2 (a) With a neat block diagram, explain the successive approximation DVM.
10 M
2 (b) With a neat block diagram, explain the digital frequency meter.
10 M

3 (a) With a neat block diagram, explain the general purpose CRO.
10 M
3 (b) With a neat block diagram, explain the typical CRT connections.
10 M

4 (a) With a neat block diagram, explain the digital storage oscilloscope.
10 M
4 (b) With a neat block diagram, explain the sampling oscilloscope.
10 M

5 (a) With a neat block diagram, explain the working principle of pulse generator.
10 M
5 (b) With a neat block diagram, explain the working principle of function generator.
10 M

6 (a) With a neat block diagram, explain the Wien's bridge to measure the frequency.
10 M
6 (b) With a neat block diagram, explain the Wagner's earth connections.
10 M

7 (a) Explain the construction and working of LVDT.
10 M
7 (b) Explain the construction and working thermistor, what are the salient features of it.
10 M

Explain the following with relevant sketch:
8 (a) Photo electric transducer.
7 M
8 (b) Piezo electro transducer.
6 M
8 (c) RTD.
7 M



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