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Posted By: muzeeb khan Member Level: Bronze Posted Date: 28 Mar 2008
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2007 Andhra Pradesh State Jawaharlal Nehru Technological University B.Tech Electrical and Electronics Engineering 3-2 EEE INSTUMENTATION Question paper
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Filename : G:\EEE1\RR320204-INSTRUMENTATION.pdf
Title : INS
Author : JNTU
Subject : EEE
Keywords : INS
Creator : MUZEEB
Producer : AFPL Ghostscript 8.11
Created Date : D:20070502150412
Modified Date: D:20070502150412
SavedBy :
Encrypt : No
Version : 1.3
Filesize : 95055
Page Count : 6
The trial version is can only convert first a few pages from PDF file to text file,
if you need convert more pages, please purchase it from 'www.verypdf.com' site.
--------------------------------------- 1
Code No: RR320204 Set No. 1
III B.Tech II Semester Regular Examinations, Apr/May 2007
INSTRUMENTATION
(Electrical & Electronic Engineering)
Time: 3 hours Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks
Æ Æ Æ Æ Æ
1. Distinguish between systematic and random errors in a measurement and how they
are usually minimized. [16]
2. Distinguish between analog modulation and digital modulation and explain the
situations under which each is preferred. [16]
3. (a) How does the sampling oscilloscope increase the apparent frequency response
of an oscilloscope.
(b) Voltage E1 is applied to the horizontal input and E2 to the vertical input of a
CRO. E1 and E2 have same frequency. The trace on the screen is an ellipse.
The slope of major axis is negative. The maximum vertical value is 3 divi-
sions and the point where the ellipse crosses the vertical axis is 2.6 divisions.
The ellipse is symmetrical about horizontal and vertical axis. Determine the
possible phase angle E2 with respect to E1 . [8+8]
4. Explain with a neat circuit diagram of a RMS voltmeter. [16]
5. (a) Discuss in detail about the principle of operation of a capacitive transducer?
(b) What is the relation between sensitivity and area of plates? [8+8]
6. (a) Explain the operation of a thermocouple for the measurement of temperature?
(b) Explain in detail about photo voltaic and photo conductive cells? [8+8]
7. (a) Explain the measurement of di
(b) Explain how load cells are used in weight measurement with a suitable sketch.
[8+8]
8. What is the principle of ultrasonic ow meter? Explain the operation of ultrasonic
ow meter with neat sketch. [16]
Æ Æ Æ Æ Æ
1 of 1
--------------------------------------- 2
Code No: RR320204 Set No. 2
III B.Tech II Semester Regular Examinations, Apr/May 2007
INSTRUMENTATION
(Electrical & Electronic Engineering)
Time: 3 hours Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks
Æ Æ Æ Æ Æ
1. Draw the block diagram of the measuring system and explain the each stage with
their functions. [16]
2. Describe the process of modulation and the techniques usually adopted. [16]
3. (a) What precautions must be taken when using a sampling oscilloscope?
(b) A lissajous pattern on the oscilloscope is stationary and has 6 vertical maxi-
mum values and ve horizontal maximum values. The frequency of the hori-
zontal input is 1500HZ. Determine the frequency of vertical input
(c) If a digitizing oscilloscope is to have a 6-bit resolution in both the horizontal
6
and vertical axis and is to display transients at a rate of 1 × 10 sec per
division for a display of 10 divisions, what is the speed required of the input
A/D converter?
[6+5+5]
4. Explain with a neat circuit diagram of a RMS voltmeter. [16]
5. (a) What are the various types of inductive transducers?
(b) Explain in detail the working of inductive transducers operating on the prin-
ciple of eddy currents? [8+8]
6. Explain in detail the applications of photodevices? [16]
7. (a) Explain the construction of di
(b) Explain in general how pressure is measured with electrical transducer as
secondary transducers. [8+8]
8. (a) Discuss the merits demerits of constant temperature method over constant
current method of measurement at ow using hot wire anemometer .
(b) With a neat sketch explain the measurement by constant - temperature anemome-
ter. [8+8]
Æ Æ Æ Æ Æ
1 of 1
--------------------------------------- 3
Code No: RR320204 Set No. 3
III B.Tech II Semester Regular Examinations, Apr/May 2007
INSTRUMENTATION
(Electrical & Electronic Engineering)
Time: 3 hours Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks
Æ Æ Æ Æ Æ
1. Distinguish the important characteristics of instrument that are totally electrical
and totally electronic in nature. [16]
2. Write short notes on:
(a) Continuous wave signals.
(b) Amplitude modulation. [8+8=16]
3. (a) An electro statically deected cathode ray tube has plane parallel deecting
plates which are 2.5cm long and 0.5cm apart, and the distance from their
centre to the screen is 20cm. The electron beam is accelerated by a potential
di
the deecting voltage required to cause the beam to strike a deecting voltage
and nd the corresponding deection of the screen.
(b) What is the relationship between the period of a waveform and its frequency?
How is an oscilloscope used to determine frequency? [8+8]
4. (a) Explain with an appropriate circuit for measurement of low impedance com-
ponent with respect to Q-meter.
(b) For measuring small values of capacitance, a 60 MHZ signal source is to be
used in a capacitance meter. What value of series resistance is required if the
phase shift is to kept below 5.7 degrees for full scale capacitance readings of
1, 10 and 100 PF.
[8+8]
5. (a) What are the various types of inductive transducers?
(b) Explain in detail the working of inductive transducers operating on the prin-
ciple of eddy currents? [8+8]
6. Explain in detail the applications of photodevices? [16]
7. (a) Explain the principle of thermo couple vaccume gauge.
(b) Explain the measurement of vaccume using pirani gauge. [8+8]
8. (a) Write short notes on post deection acceleration with respect to oscilloscope
tube.
(b) What is the minimum distance, L, that will allow full deection of 4cm at the
oscilloscope screen with a deection factor of 100v/cm and with an accelerating
potential of 2000v. [8+8]
1 of 2
--------------------------------------- 4
CodeNo:RR320204 SetNo.3
ÆÆÆÆÆ
2of2
--------------------------------------- 5
Code No: RR320204 Set No. 4
III B.Tech II Semester Regular Examinations, Apr/May 2007
INSTRUMENTATION
(Electrical & Electronic Engineering)
Time: 3 hours Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks
Æ Æ Æ Æ Æ
1. (a) Dene Instrumentation and the importance of the Instrumentation systems.
(b) Explain the role of electronic circuits in the eld of modern Instrumentation.
(c) Distinguish a meter from an instrument and state the primary role of each.
[5+5+6]
2. (a) Distinguish between periodic and a periodic signals and give examples for
each.
(b) Derive from fundamentals the expression representing a rectangular wave by
Fourier series. [8+8]
[LId Ed]
3. Derive the equation D = with respect to the concept of electrostatic de-
[2dEa]
ection of a cathode ray oscilloscope, where D= deection of electron beam on
the screen in Y direction; mtr, L= distance between screen and the centre of the
deecting plates; mtrs; Id = length of the deecting plates, Ed = potential be-
tween deecting plates, d= distance between deecting plates, Ea = voltage of the
pre-accelerating anode. [16]
4. (a) Write short notes on:
i. Resolution in digital meters
ii. Sensitivity of digital meters
(b) A 4 1/2 digit voltmeter is used for voltage measurements.
i. Find its resolution
ii. How would 12.98 volts be displayed on 10 volt range?
iii. How would 0.6973 be displayed on 1 volt range?
iv. How would 0.6973 be displayed on 10 volt range? [10+6]
5. (a) A single strain gauge is mounted to measure the axial strain in a simple tensile.
member. If the recorded strain is 380 micro strain what is the axial stress.
i. if the member is steel?
ii. if the member is aluminium?
(b) What are the advantages of electrical transducers? [8+8]
6. (a) Discuss specications of LVDT ?
?2 0
Code No: RR320204 mv/ c and % = 4.5x
5 0 0
10 mv/ c. If T1 = 100 c and the cold junction T2 is kept in ice compute
the resulting emf?
[8+8]
1 of 2
--------------------------------------- 6
Code No: RR320204 Set No. 4
7. (a) Explain the construction of di
(b) Explain in general how pressure is measured with electrical transducer as
secondary transducers. [8+8]
8. (a) Explain in general, the measurement of torque using digital technique com-
pare the merits of multi toothed ange over single toothed ange. Give the
necessary sketch.
(b) Explain the measurement of torque using strain gauge torque method. Also
give the advantages of this method. [8+8]
Æ Æ Æ Æ Æ
2 of 2
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