Download AKTU (Dr. A.P.J. Abdul Kalam Technical University (AKTU), formerly Uttar Pradesh Technical University (UPTU)) B-Tech 4th Semester (Fourth Semester) 2017-18 REC403 Electronic Measurement And Instrumentation Question Paper
Paper Id: 131413 Roll No.
B TECH
(SEM-IV) THEORY EXAMINATION 2017-18
ELECTRONIC MEASUREMENT & INSTRUMENTATION
Time: 3 Hours Total Marks: 70
Note: 1. Attempt all Sections. If require any missing data; then choose suitably.
SECTION A
1. Attempt all questions in brief. 2 x 7 = 14
a. Define primary and secondary standards.
b. What do mean by Dissipation factor?
c. How emitter follower structure reduces voltmeter loading effect?
d. Define importance of Kelvin double bridge over Wheatstone bridge.
e. The measured value of a resistance is 10.25?, whereas its value is 10.22?. Determine the
absolute error of measurement.
f. What are the essential components of a CRT?
g. What do you understand by instrument calibration?
SECTION B
2. Attempt any three of the following: 7 x 3 = 21
a. Explain the construction of PMMC instrument. Mathematically prove that the scale of
such an instrument is linear.
b. Draw and explain the FET input voltmeter circuit with range changing.
c. Derive an expression for finding unknown resistance and inductance for Maxwell Bridge.
d. Draw and explain the block diagram of Oscilloscope automatic time base with proper
waveforms at the output of each block.
e. Write a short note on working and applications of X ?Y recorder.
SECTION C
3. Attempt any one part of the following: 7 x 1 = 7
a. Define systematic errors in details. A batch of resistors that each have a nominal
resistance of 330? are to be tested and classified as ?10% components at 25
o
C. If their
temperature coefficient is -300ppm/
o
C, calculate the maximum and minimum resistance
for these components at 75
o
C.
b. Explain the concept of Swamping resistance. What are the materials generally used for
manufacturing these resistances? A PMMC instrument with FSD of 0.2mA and the coil
resistance of 10? is to be converted into a voltmeter. Determine the required multiplier
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Printed Pages: 02 Sub Code: REC403
Paper Id: 131413 Roll No.
B TECH
(SEM-IV) THEORY EXAMINATION 2017-18
ELECTRONIC MEASUREMENT & INSTRUMENTATION
Time: 3 Hours Total Marks: 70
Note: 1. Attempt all Sections. If require any missing data; then choose suitably.
SECTION A
1. Attempt all questions in brief. 2 x 7 = 14
a. Define primary and secondary standards.
b. What do mean by Dissipation factor?
c. How emitter follower structure reduces voltmeter loading effect?
d. Define importance of Kelvin double bridge over Wheatstone bridge.
e. The measured value of a resistance is 10.25?, whereas its value is 10.22?. Determine the
absolute error of measurement.
f. What are the essential components of a CRT?
g. What do you understand by instrument calibration?
SECTION B
2. Attempt any three of the following: 7 x 3 = 21
a. Explain the construction of PMMC instrument. Mathematically prove that the scale of
such an instrument is linear.
b. Draw and explain the FET input voltmeter circuit with range changing.
c. Derive an expression for finding unknown resistance and inductance for Maxwell Bridge.
d. Draw and explain the block diagram of Oscilloscope automatic time base with proper
waveforms at the output of each block.
e. Write a short note on working and applications of X ?Y recorder.
SECTION C
3. Attempt any one part of the following: 7 x 1 = 7
a. Define systematic errors in details. A batch of resistors that each have a nominal
resistance of 330? are to be tested and classified as ?10% components at 25
o
C. If their
temperature coefficient is -300ppm/
o
C, calculate the maximum and minimum resistance
for these components at 75
o
C.
b. Explain the concept of Swamping resistance. What are the materials generally used for
manufacturing these resistances? A PMMC instrument with FSD of 0.2mA and the coil
resistance of 10? is to be converted into a voltmeter. Determine the required multiplier
resistance if the voltmeter is used to measure 100V at full scale. Also determine the
applied voltage when the instrument indicates 0.75, 0.5 ,0.25 and 0.1FSD.
4. Attempt any one part of the following: 7 x 1 = 7
a. Explain Digital Multi meter. A 4
Digit voltmeter is used to measure voltage. Find ( i)
Resolution (ii) How would 16.58 be displayed on a10V range.
b. Define dual-slope integrator and zero crossing detector. Sketch the block diagram and
system waveforms for a digital voltmeter that uses a dual slope integrator.
5. Attempt any one part of the following: 7 x 1 = 7
a. Show how an ammeter, a voltmeter, and a DC supply can be used to measure a
resistance. Show the two possible connection, write the resistance equation for each and
discuss the error.
b. Draw the circuit of a kelvin bridge, explain its operation, and derive the equation for the
unknown resistance.
6. Attempt any one part of the following: 7 x 1 = 7
a. Explain the following in detail with their diagram:
(i) Attenuator probe
(ii) 1:1 Probe
b. Write short note on DSO. Compare it with Sampling Oscilloscope.
7. Attempt any one part of the following: 7 x 1 = 7
a. Sketch the basic construction of a pen type galvanometer strip chart recorder. Briefly
explain the instrument operation.
b. What is importance of calibration in instrumentation sketch the circuit for calibrating a
wattmeter and explain the calibration procedure.
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This post was last modified on 29 January 2020