USN 10IT35

Third Semester B.E. Degree Examination, Dec.2013 / Jan.2Ol4 :: ::

Electronic lnstrumentation . ',

Time: 3 hrs. Max. Markg:100

Note: .4nswer any FIVEfull questions, selecting atleast TWO questionsfrdmeach part.:::.

PART-A ."t"".'.,,

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I a. Define the following terms as applied to an instrument : i) Accuracy and Precisionii) Random error iiil Absolute and relative error ir) ,Gxoss error v) Systematicerror. ,,

' (06 Marks)b. Determine the vaiue of the multiplier resistance on the 50V range of a dc voltmeter that uses

a250pA meter movement with an internal resistance of 100Q. (06 Marks)c. Explain in detail the working of true RMS volt rrrcter and give the difference between peak

(08 Marks)

2 a. Explain in detail the working of successive approximation tlpe digital voltmeter and givethe O/P for 4 bit control word. (08 Marks)

b. A 4% digit DUM is used for voltage measurements, i) Find its resolution ii) How would67.50Y be displayed on a 5V range iii) How would 0.716V be displayed on lV and10V ranges.

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c. Explain in detail the working of digital multimetet.

Explain in detail the generation of time base signal for the horizontal deflecting plates.(05 Marks)

What is an electroflrd'*n.n and explain in detail lt, *.iAi..*odes of operation? (05 Marks)List the various control knobs on the front panel of CRO. (04 Marks)

(06 Marks)(06 Marks)

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An electrically deflected CRT has a final anode voltage of 2000V and parallel deflectingplates 1.59m apart. If the screen is 50cm from the center of t'h€ deflecting plates, findi) Beam speed ii) Deflection sensitivity of the tube iiD Deflection factor. (06 Marks)

4 a. ,,E4plain in detail the working of sampling oscilloscope, with necessary waveforms.' ''' (10 Marks)Explain in detail the working of digital storage oscilloscope and list the advantages of DSO.

(10 klarks)

PART _ B

Explain in detail the working of function generator.

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5a.b.c.

Explain in detail the working of square and pulse generator.Explain in detail the working of sine and square wave generator. (04

a. Explain in detail the working of wien bridge oscillator and find the parallel 'R' and 'C' thatcauses a wien bridge to null with the following components values. (12 Marks)R1 :2.7kC) , R2:22KA, Cl :5lrF , Rq: l00k0andtheoperating frequency is2.2KJ{2.

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10IT35

For the wheat stone bridge shown in fig. Q6(b), the galvanometer has a current sensitivity ofl2mmlpA. The internal resistance of galvanometer is 200Q. Calculate the deflection of thegalvanometer caused due to 5Q unbalance in the arm AD.

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Explain in detail the working of resistive position transducer afld f,i;o calculate the outputvoltage when,wjper is 10cm from extreme end for the applied voltage of 5V and if theresistive positid.tiansducer uses a shaft with a stroke

?{tOcm The total resistance of the

potentiometer is 5kQ. ,,,,, r,,,.. (10 Marks)Explain the construCtion principle and operation of LVDT. (10 Marks)

8a.b.c.

Write a short note on signal,eonditioning system.Explain the working of piezo eleCulc transdlmerwith circuit diagram.Compare LED displays and LCDdip,plafs.

(06 Marks)(10 Marks)(04 Marks)

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