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Roll No.
Total No. of Pages : 02
Total No. of Questions : 09

B.Tech.(ETE) / (ECE) / (Electronics & Computer Engg.) (2011 Onwards)/
B Tech.(Electronics Engg.) (2012 Onwards)
(Sem.?4)
ELECTRONIC MEASUREMENT & INSTRUMENTATION
Subject Code : BTEC-404
M.Code : 57596
Time : 3 Hrs. Max. Marks : 60
INSTRUCTIONS TO CANDIDATES :
1.
SECTION-A is COMPULSORY consisting of TEN questions carrying T WO marks
each.
2.
SECTION-B contains FIVE questions carrying FIVE marks each and students
have to attempt any FOUR questions.
3.
SECTION-C contains T HREE questions carrying T EN marks each and students
have to attempt any T WO questions.




SECTION-A
1.
Answer briefy :
(2?10=20)

a. Compare Hay's Bridge and Maxwell's Bridge.

b. Write the working principle of a non planar display device.


c. Describe the terms: resolution and hysteresis.


d. What will be the output on screen of CRO if a sinusoidal voltage is applied to vertical

deflection plates but no voltage is applied to horizontal deflection plate?

e. Explain the ter www.FirstRanker.com
ms: Dissipation Factor and Q factor.


f. What is the principle of photoelectric transducers? Give examples.


g. What controls the frequency of the displayed signal on CRO?

h. What are the various dynamic characteristics of instrumentation system?


i. What do you understand by LVDT?


j. Find the series equivalent inductance and resistance of the network that causes such a

bridge to null with following bridge arms: = 3KHz, R and C in series of 2K and

lF in one arm, two other opposite arms have 10K in one and 1Kin other arm.
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SECTION-B
2.
With the help of Block diagram and suitable waveforms explain Integrating type digital
voltmeters.
5
3.
Explain the working and applications of Piezoelectric crystal.
5
4.
Explain the principle and various components used for magnetic recorders?
5
5.
How can the frequency be measured? Give its circuit and derive the relations.
5
6.
What is telemetry? Explain any two applications of telemetry.
5

SECTION-C
7.
a) Give construction and working of PMMC instruments with torque equation.
7

b) A PMMC has a coil dimension of 17mm ? 13mm. the flux density in the sir gap is

1.9 ? 10?3 Wb/m2 and spring constant is 0.17 ? 10?6 Nm/rad. Determine the number

of turns required to produce an angular deflection of 90? when a current of 7mA

flowsthrough the coil.
3
8.
a) Explain the working of Schering bridge and derive an expression for measurement of

unknown capacitance and its loss angle. Draw the phasor diagram under null

conditions.
6

b) Determine the value of R1 and L1 of the inductor connected in Maxwell capacitance

bridge circuit. One arm has C4 and R4 in parallel of 0.5F and 1 K. Other two

opposite arms have resistance of R2 = 400 and R3 = 600. Also find the Q factor of

the coil if f = 1 KHz.
4
9.
a) Explain the block diagram of CRO in detail. Give the application of CRO for

measurement of phase and frequency.
7

b) Describe Harmwww.FirstRanker.com
onic distortion analyzer.
3



NOTE : Disclosure of Identity by writing Mobile No. or Making of passing request on any
page of Answer Sheet will lead to UMC against the Student.
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