Model question paper of ELECTRONIC MEASUREMENTS AND INSTRUMENTATION of Diploma 3rd Sem - E & CE

DERARTMENT OF TECHNICAL EDUCATION

DIPLOMA COURSE IN ELECTRONICS & COMMUNICATION ENGG.

THIRD SEMESTER

    ELECTRONIC MEASUREMENTS AND INSTRUMENTATION                                                 

MODEL QUESTION PAPER

MAX MARKS:100                                                               TIME :3Hrs

       
INSTRUCTIONS:-
1) SECTION-I IS COMPULSORY   
2 ) ANSWER ANY TWO FULL QUESTIONS FROM EACH OF THE REMAINING    
    SECTIONS.

SECTION –I

1(a) Fill in the Blanks                                                                           5 X 1 = 5

1.                  Wein bridge is normally used for the measurement of ________

2.                  An example of inverse transducer is__________.

3.                  _________coating is used to collect secondary electrons in CRT.

4.                  The standards maintained at National standard labs are called ________

5.                  Errors due to human mistakes are called ____________.

  (b) Write a note on IEEE488 GPIB interfacing.          5

SECTION-II

2 (a)  Explain with  a block diagram, the operation of a generalized electronic

           measurement system.                  9

     (b)  Define (i) accuracy (ii) Precision (iii) Error w.r.t measurements     6

3(a) A 0-100Volt Voltmeter has an accuracy of 1% of full scale reading.
    If the voltage measured by this instrument is 83 volts, find the limiting error in percentage   5

   (b) Explain the use of wein's bridge in frequency measurement.
     Derive the equation for unknown frequency.       10

4(a) Explain the operation of the basic PMMC movement .     7

   (b) Explain the basic principle of  Electrodynamometer .        6

    (c) Define voltmeter sensitivity.                      2

SECTION-III

5(a) With the help of a block diagram, explain the operation of Digital Storage

        Oscilloscope.           9

(b) What are lissajous patterns?. Explain how they can be used for phase difference

       measurement.        6

6(a) Explain the working of Heterodyne wave analyzer.     6

   (b)  list the uses of Spectrum analyzer.                 3

   (c) What are active , passive and inverse transducers? Give example for each.   6

7(a)     Explain the principle of LVDT displacement transducer.   6

  (b)  List the advantages and disadvantages of thermistors.   4

   (c)  write a note on digital optical Encoders.             5

                                                                                                                                   

SECTION-IV

8(a) Explain the working of Chopper DC amplifier type voltmeter.       7

   (b) Explain the operation of Q meter.              8

9(a) Explain the working of Successive approximation type DVM.     10

   (b) List the advantages of digital instruments.      5

10(a) Explain the principle of digital time interval measurement.    5

     (b) List the precautions to prevent instrument damage.    5

     (c)Write a note on shielding.          5