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MU Electronics Engineering (Semester 3)
Electronic Instruments and Measurements
December 2012
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) Define sensitivity of an analog instrument. For PMMC instrument with FSD=100 mA find sensitivity
5 M
1 (b) What is Megger? Explain its working
5 M
1 (c) For ADC define resolution. Give suitable example
5 M
1 (d) Explain the working principle of DC Motor
5 M
1 (e) Explain the function of delay line in oscilloscope. What are the types of delay lines?
5 M

2 (a) What is intensity modulation? For what it is used? Can phase and frequency be measured using intensity modualtion?
10 M
2 (b) What is Q meter? Explain any one of the types of Q meter with the help of circuit diagram
10 M

3 (a) Draw and explain Kelvin's Bridge
10 M
3 (b) Explain the operating principle of 3-phase induction motor
10 M

4 (a) Draw and explain the block diagram of digital storage oscilloscope
10 M
4 (b) Explain R-2R ladder techniques of digital to analog converter
10 M

5 (a) Draw and explain any one of the types of electronic voltmeter. State its two advantages over analog voltmeter
10 M
5 (b) Explain digital phase meter using flip flop. Draw relevant waveforms at each point in a block diagram to illustrate
10 M

6 (a) Explain Schering bridge for measurement of capacitance. Derive the equation of unknown capacitance at balanced condition
10 M
6 (b) What is energy meter? Draw its constructional view and explain
10 M

Write short notes on (any two) :-
7 (a) Variable reluctance stepper motor
10 M
7 (b) A.F. signal generator
10 M
7 (c) Digital frequency meter
10 M

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