IMPORTANT QUESTIONS FOR PUT
ELECTRONIC INSTRUMENTATION (EC-303)
UNIT I
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Explain accuracy and precision.
What do you understand by sensitivity of an instrument?
Explain the following errors: (i) Instrument error (ii) Limiting error (iii) Random error.
Briefly describe the principle of bolometer power meter.
Explain the working of electronic chopper type DC voltmeter.
UNIT II
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Differentiate dual trace and dual beam CRO.
What do you meant by post and pre deflection acceleration?
Draw the block diagram of CRO.
Explain the functioning of time base generator in CRO.
Describe in details the construction and working of an analog type storage oscilloscope.
What is Oscillator?
UNIT III
12. Which bridge is used for measurement of audio frequency .Also write the formula for
frequency obtained by same bridge.
13. What do you meant by transducer?
14. What are the advantages and disadvantages of LVDT?
15. Explain the construction and working principle of a linear variable differential transformer
(L.V.D.T).Explain how the magnitude and direction of the displacement of core of an
L.V.D.T is detected?
16. Derive the equation of balance for a Schering bridge with its phasor diagram. Also discuss
the advantages and disadvantages of the bridge.
17. What do you mean by the balanced bridge.
18. What is the use of Wagner Earth Devices.
UNIT IV
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What is the use of sweep frequency generator?
What is beat frequency oscillator?
Give the comparison between LED & LCD.
Explain the working of function generator with the aided of block diagram.
Describe the working of a sweep frequency generator using Heterodyne Frequency
Generator.
24. Explain the working of function generator with the aided of block diagram.
25. Describe the working of a sweep frequency generator using Heterodyne Frequency
Generator.
UNIT V
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A 4 2 digital voltmeter is used for voltage measurements. Find its resolution.
Draw the block diagram of Dual slop integrating type DVM.
Give the advantages of digital instrument over analog instruments.
Draw and explain the architecture of PLC.
Explain successive approximation method.
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