B.E/B.Tech DEGREE EXAMINATION NOVEMBER/DECEMBER 2007
Sixth Semester
Electrical and Electronice Engineering
EI 1361 -- MEASUREMENTS AND INSTRUMENTATION
(Regulation 2004)
Time: Three hours Maximum marks: 100
Answer ALL questions
PART A (10 x 2 =20 marks)
1. Distinguish between the direct and indirect methods of measurements.
2. With one example explain "Instrumental Errors"
3. Explain the principle of analog type electrical instruments.
4. How a PMMC meter can be used as voltmeter and ammeter?
5. Draw Maxwell's AC bridge and give the balance equation interms of resistance.
6. Explain any two technical parameters to be consider in grounding.
7. Explain the characteristics of Time domain output device using in measurements.
8. Explain the following term as applied to digital displays.
3½ digit and 4½ digit displays.
9. Define inverse transducer with example.
10. Explain the principle of piezoelectric transducers and name any two piezoelectric materials.
PART B (5 x 16 = 80)
11 (i) What are the basic blocks of a generalized instrumentation system. Draw the various blocks and explain their functions. (10)
(ii) Explain in detail calibration technique and draw the calibration curve in general. (6)
(or)
(b) (i) Discuss in detail various types errors associated in measurement and how these errors can be minimized? (10)
(ii)Define the following terms in the context of normal frequency distribution of data (6)
(1) Mean value
(2) Deviation
(3) Average deviation
(4) Variance
(5) Standard deviation.
12. (a) Describe the construction, principle of working and applications of synchro transformers. (16)
(or)
(b) Discuss why is it necessary to carry out frequency domain analysis of measurement systems? What are the two plots obtained when the frequency response of a system is carried out? (16)
13 (a) Explain voltage sensitive self balancing bridge, and derive the bridge sensitivity of voltage sensitive bridge with fundamentals. (16)
(or)
(b) (i) With fundamentals distinguish between DC and AC potentiometers, and give any two specific applications for each. (8)
(ii) Discuss the advantages and limitations of electromagnetic interference in measurements. (8)
14. (a) Describe the construction and working of LCDs, mention the difference between light scattering and field effect types of LCDs, also explain the advantages of LCDs. (16)
(or)
(b) (i) What is an XY recorders? How do you distinguish is from X - t and Y - t recorders? (8)
(ii) Describe the pulse duration modulation (PDM) as used in magnetic tape recording and explain its merits and demerits. (8)
15. (a) (i) Describe the different criteria for selection transducers for a particular application. (8)
(ii) Explain the different principles of working of capacitive transducers. (8)
(or)
(b) (i) How is a differential output taken from an inductive transducer?Explain the advantages when inductive transducers are used in push - pull configuration. (8)
(ii) Describe in detail the successive approximation method of analog to digital conversion. (8)
Sixth Semester
Electrical and Electronice Engineering
EI 1361 -- MEASUREMENTS AND INSTRUMENTATION
(Regulation 2004)
Time: Three hours Maximum marks: 100
Answer ALL questions
PART A (10 x 2 =20 marks)
1. Distinguish between the direct and indirect methods of measurements.
2. With one example explain "Instrumental Errors"
3. Explain the principle of analog type electrical instruments.
4. How a PMMC meter can be used as voltmeter and ammeter?
5. Draw Maxwell's AC bridge and give the balance equation interms of resistance.
6. Explain any two technical parameters to be consider in grounding.
7. Explain the characteristics of Time domain output device using in measurements.
8. Explain the following term as applied to digital displays.
3½ digit and 4½ digit displays.
9. Define inverse transducer with example.
10. Explain the principle of piezoelectric transducers and name any two piezoelectric materials.
PART B (5 x 16 = 80)
11 (i) What are the basic blocks of a generalized instrumentation system. Draw the various blocks and explain their functions. (10)
(ii) Explain in detail calibration technique and draw the calibration curve in general. (6)
(or)
(b) (i) Discuss in detail various types errors associated in measurement and how these errors can be minimized? (10)
(ii)Define the following terms in the context of normal frequency distribution of data (6)
(1) Mean value
(2) Deviation
(3) Average deviation
(4) Variance
(5) Standard deviation.
12. (a) Describe the construction, principle of working and applications of synchro transformers. (16)
(or)
(b) Discuss why is it necessary to carry out frequency domain analysis of measurement systems? What are the two plots obtained when the frequency response of a system is carried out? (16)
13 (a) Explain voltage sensitive self balancing bridge, and derive the bridge sensitivity of voltage sensitive bridge with fundamentals. (16)
(or)
(b) (i) With fundamentals distinguish between DC and AC potentiometers, and give any two specific applications for each. (8)
(ii) Discuss the advantages and limitations of electromagnetic interference in measurements. (8)
14. (a) Describe the construction and working of LCDs, mention the difference between light scattering and field effect types of LCDs, also explain the advantages of LCDs. (16)
(or)
(b) (i) What is an XY recorders? How do you distinguish is from X - t and Y - t recorders? (8)
(ii) Describe the pulse duration modulation (PDM) as used in magnetic tape recording and explain its merits and demerits. (8)
15. (a) (i) Describe the different criteria for selection transducers for a particular application. (8)
(ii) Explain the different principles of working of capacitive transducers. (8)
(or)
(b) (i) How is a differential output taken from an inductive transducer?Explain the advantages when inductive transducers are used in push - pull configuration. (8)
(ii) Describe in detail the successive approximation method of analog to digital conversion. (8)
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