Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2018 Winter 4th Sem New 2141003 Electronics Measurement And Instrumentation Previous Question Paper
1
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?IV (NEW) EXAMINATION ? WINTER 2018
Subject Code:2141003 Date:01/12/2018
Subject Name:Electronics Measurement and Instrumentation
Time: 02:30 PM TO 05:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
MARKS
Q.1 Fill in the blanks 14
1 The repeat accuracy of an instrument can be judged from its _____ of
error.
2 A _____ device prevents the oscillation of the moving system and
enables the latter to reach its final position quickly.
3 A _____ is a passive transducer and is employed for converting
mechanical displacement into a change of resistance.
4 LVDT windings are wound on _____ material.
5 A permanent magnet moving coil instrument can be used as _____ by
using a low resistance shunt.
6 A null type of bridge with DC excitation is commonly known as _____
bridge.
7 Storage oscilloscope operates on _____ principle.
8 To avoid the effect of _____ in AC bridges we can use magnetic
screening.
9 To measure the flux, devices used are based on _____ effect.
10 A spectrum analyzer is used to measure _____ .
11 _____ shape signals are generated by Wien-bridge oscillators.
12 Most suitable material for a thermocouple is _____ .
13 Focusing and accelerating anodes are of _____ shape.
14 _____ technique is most widely used in the single channel data
acquisition system.
Q.2 (a) Define: (1) Sensitivity, (2) Reproducibility, (3) Repeatability. 03
(b) Give the difference between Systematic error and Random error. 04
(c) What are the difficulties associated with low resistance measurement?
Explain working principle of Kelvin?s double bridge.
07
OR
(c) Elaborate the Maxwell?s induction-capacitance bridge and give its
advantages and disadvantages.
07
Q.3 (a) What is deflection defocusing and its causes? 03
(b) Why phosphor screen is provided with an aluminum layer in Cathode
Ray Tube?
04
(c) Explain Digital frequency meter. 07
OR
Q.3 (a) Define: (1) gating error, (2) time base error, (3) trigger level error. 03
(b) Explain constant current mode and constant voltage mode with respect
to Vector impedance meter.
04
(c) Draw and explain neat schematic diagram of Cathode Ray Tube. 07
Q.4 (a) Write advantages of Wien Bridge Oscillator. 03
(b) Explain the two types of delay line in CRO. 04
(c) Explain the sweep frequency generator. 07
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1
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?IV (NEW) EXAMINATION ? WINTER 2018
Subject Code:2141003 Date:01/12/2018
Subject Name:Electronics Measurement and Instrumentation
Time: 02:30 PM TO 05:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
MARKS
Q.1 Fill in the blanks 14
1 The repeat accuracy of an instrument can be judged from its _____ of
error.
2 A _____ device prevents the oscillation of the moving system and
enables the latter to reach its final position quickly.
3 A _____ is a passive transducer and is employed for converting
mechanical displacement into a change of resistance.
4 LVDT windings are wound on _____ material.
5 A permanent magnet moving coil instrument can be used as _____ by
using a low resistance shunt.
6 A null type of bridge with DC excitation is commonly known as _____
bridge.
7 Storage oscilloscope operates on _____ principle.
8 To avoid the effect of _____ in AC bridges we can use magnetic
screening.
9 To measure the flux, devices used are based on _____ effect.
10 A spectrum analyzer is used to measure _____ .
11 _____ shape signals are generated by Wien-bridge oscillators.
12 Most suitable material for a thermocouple is _____ .
13 Focusing and accelerating anodes are of _____ shape.
14 _____ technique is most widely used in the single channel data
acquisition system.
Q.2 (a) Define: (1) Sensitivity, (2) Reproducibility, (3) Repeatability. 03
(b) Give the difference between Systematic error and Random error. 04
(c) What are the difficulties associated with low resistance measurement?
Explain working principle of Kelvin?s double bridge.
07
OR
(c) Elaborate the Maxwell?s induction-capacitance bridge and give its
advantages and disadvantages.
07
Q.3 (a) What is deflection defocusing and its causes? 03
(b) Why phosphor screen is provided with an aluminum layer in Cathode
Ray Tube?
04
(c) Explain Digital frequency meter. 07
OR
Q.3 (a) Define: (1) gating error, (2) time base error, (3) trigger level error. 03
(b) Explain constant current mode and constant voltage mode with respect
to Vector impedance meter.
04
(c) Draw and explain neat schematic diagram of Cathode Ray Tube. 07
Q.4 (a) Write advantages of Wien Bridge Oscillator. 03
(b) Explain the two types of delay line in CRO. 04
(c) Explain the sweep frequency generator. 07
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2
OR
Q.4 (a) Give applications of Wave analyzer. 03
(b) Compare standard signal generator with modern signal generator. 04
(c) Explain Resistance Temperature Detector and its lead compensation
method.
07
Q.5 (a) What are the piezoresistive and piezoelectric effects? 03
(b) What is Lock-in amplifier? 04
(c) Elaborate Hall-effect transducer. 07
OR
Q.5 (a) Note the importance any three components of Digital Acquisition
System.
03
(b) What are the advantages of opto-couplers? 04
(c) Explain principle, operation, working, applications of LVDT. 07
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This post was last modified on 20 February 2020