# JNTU Kakinada B-Tech 4-1 INSTRUMENTATION (Open Elective) R13 March 2018 Question Paper

IV B.Tech I Semester Supplementary Examinations, February/March – 2018
INSTRUMENTATION (Open Elective)Time: 3 hours Max. Marks: 70
Question paper consists of Part-A and Part-B
Answer ALL sub questions from Part-A
Answer any THREE questions from Part-B
*****

PART ?A (22 Marks)1. a) List out the static characteristics of an instrument. [3]
b) What are the various types of transducers? [4]
c) Define gauge sensitivity [4]
d) What are the specifications of digital voltmeters? [4]
e) What is the function of phosphor screen in CRO? [4]
f) What is a Q meter? Discuss [3]

PART ?B (3×16 = 48 Marks)2. a) What is pulse code modulation? Give an example? [8]
b) The current through a resistor is 5A, but the measurement yields a value of 4.9A.
Calculate the absolute error and the percentage error of the measurement.
[8]

3. a) Discuss in detail about the advantages of electrical transducers [8]
b) A certain crystal has a coupling coefficient of 0.32. How much electrical energy
must be applied to produce an output of 1 oz.in. of mechanical energy.
[8]

b) Discuss in detail about various methods of measuring angular velocity. [8]

5. a) Explain the advantages and disadvantages of microprocessor based ramp type
digital voltmeters.
[8]
b) A 3 ? digital voltmeter is used for measuring voltage. Find the resolution of the
instrument. How would a voltage of 14.42 be displaced on 10 V range? How
would be a reading 14.42 be displaced on 100 V range?

[8]

6. a) Draw various lissajous patterns and explain their significance. [8]
b) A CRO with a sensitivity of 5 V/cm is used. AC voltages of different magnitudes
are applied to the y-input each time. Determine the AC voltages if the length of
the straight lines observed are (i) 5 cm (ii)12 cm

[8]

7. a) Discuss about various types of Harmonic distortion analyzers. [8]
b) Discuss in detail about the operation of RMS voltmeters in detail. [8]

Code No: RT41025
Set No. 1
R13
1 of 1

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