8/16/2019 EUREC-606

1/2

[April-15]

[EUREC 606A]

B.Tech. Degree Examination

Electronics & Communication Engineering

VI SEMESTER

ELECTRONIC MEASUREMENTS AND INSTRUMENTATION

(Effective from the admitted batch 2012 – 

13)

Time: 3 Hours Max.Marks: 60

--------------------------------------------------------------------------------------Instructions: Each Unit carries 12 marks.

Answer all units choosing one question from each unit.

All parts of the unit must be answered in one place only.Figures in the right hand margin indicate marks allotted.

---------------------------------------------------------------------------------------------

UNIT-I

1. a) Explain about sources of errors of different types of errors and

precautions to minimize them 6b) The accuracy of five digital voltmeters are checked by using

each of them to measure a standard 1.0000V from a calibration

instrument. The voltmeter readings are as follows:

V1=1.001v, V2=1.002v, V3=0.999v, V4=0.998v and V5=1.0000v.Calculate the average measured voltage and the average deviation 6

OR

2. a) Explain the basic principle of a shunt type ohmmeter 6

b) Calculate the maximum percentage error in the sum and difference

of two voltage measurements when V1=100v1% and V2=80v5% 6

UNIT-II

3. a) Draw the circuit diagram of voltmeter using an op-amp

voltage-to-current converter and explain the operation 6

b) A 20 V DC voltage is measured by digital multimeter. The

digital meter has 3 ½ digit display and an accuracy of  (0.6+1).

Determine the measurement accuracy 6

8/16/2019 EUREC-606

2/2

OR

4. a) With a neat diagram, explain the working of a True RMS

responding volt meter 6

b) A PMMC instrument has FSD of 100 A and a coil resistance of 

1K. Calculate the required shunt resistance value to convert theinstrument into an ammeter with

i) FSD=100mA and ii) FSD=1A 6

UNIT-III

5. a) Explain how Lissajous figures are used to determine the

characteristics of unknown input. Show how to estimateinput if the pattern is

i) Circle ii) Ellipse iii) Parabola 6

b) Derive an expression for electrostatic deflection sensitivity of 

a CRO 6OR

6. a) Draw the block diagram of storage oscilloscope and explain the

function of each block 6

b) Derive the expression for vertical deflection of electron beamin CRT 6

UNIT-IV

7. a) What is the principle of harmonic distortion analyzer? Explain its

operation with the help of a functional block diagram 6

b) Compare the selectivity characteristics of the Spectrum Analyzerand Wave Analyzer 6

OR

8. a) With a neat sketch explain the operation of a heterodyne type

wave analyzer 6

b) Explain the following terms associated with Spectrum Analyzer:

i) Sensitivity ii) Dynamic Range iii) Harmonic Mixing 6

UNIT-V

9. a) Explain the construction and operation of an ECG recorder 6

b) What is multiplexing? Using multiplexing, explain multi-channel

data acquisition system 6

OR

10. a) State and explain bus interface standards 6

b) Explain different steps adopted by a controller in data acquisitionin asynchronous mode. When asynchronous method of data

acquisition is required 6

[04/VI S/115]