EE6404 Measurements and Instrumentation Important Questions

UNIT – I

INTRODUCTION

PART – A

1. What are the functional elements of an instrument? (2)

2. What is meant by accuracy of an instrument? (2)

3. Define international standard for ohm? (2)

4. What is primary sensing element? (2)

5. What is calibration? (2)

6. Define the terms precision & sensitivity. (2)

7. What are primary standards? Where are they used? (2)

8. When are static characteristics important? (2)

9. What is standard? What are the different types of standards? (2)

10. Define static error. Distinguish reproducibility and repeatability. (2)

11. Distinguish between direct and indirect methods of measurements. (2)

12. With one example explain “Instrumental Errors”. (2)

13. Name some static and dynamic characteristics. (2)

14. State the difference between accuracy and precision of a measurement. (2)

15. What are primary and secondary measurements? (2)

16. What are the functions of instruments and measurement systems? (2)

17. What is an error? How it is classified? (2)

18. Classify the standards of measurement? (2)

19. Define standard deviation and average deviation. (2)

20. What are the sources of error? (2)

PART – B

1. Describe the functional elements of an instrument with its block diagram. And illustrate them

with pressure gauge, pressure thermometer and D’Arsonval galvanometer. (16)

2. What are the three categories of systematic errors in the instrument and explain in detail.

(16)

3. (i) What are the basic blocks of a generalized instrumentation system. Draw the various

blocks and explain their functions. (10)

Important Questions from annauniverzity.com

EE6404 Measurements and Instrumentation

(ii) Explain in detail calibration technique and draw the calibration curve in general. (6)

4. (i) Discuss in detail various types of 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)

a) Mean value, b) Deviation, c) Average deviation, d) Variance e) Standard deviation.

5. (i) Define and explain the following static characteristics of an instrument. (8)

a) Accuracy, b) Resolution, c) Sensitivity and d) Linearity

(ii) Define and explain the types of static errors possible in an instrument. (8)

6. Discuss in detail the various static and dynamic characteristics of a measuring system.

(16)

7. (i) For the given data, calculate

a) Arithmetic mean, b) Deviation of each value, c) Algebraic sum of the deviations (6)

X1 = 49.7, X2 = 50.1, X3 = 50.2, X4 = 49.6, X5 = 49.7 (ii) Explain in detail the types of static

error. (7)

(iii) Give a note on dynamic characteristics. (3)

8. (i) What is standard? Explain the different types of standards? (8)

(ii) What are the different standard inputs for studying the dynamic response of a system?

Define and sketch them. (8)

9. a) Define resolution. (4) b) What is threshold? (4)

c) Define zero drift. (4) d) What are random errors? (4)

10. Explain the Normal or Gaussian curve of errors in the study of random effects. (16)

UNIT – II

ELECTRICAL AND ELECTRONICS INSTRUMENTS

PART – A

1. State the principle of digital voltmeter. (2)

2. Give the importance of iron loss measurement. (2)

3. List two instruments for measurement of frequency. (2)

4. Write the function of instrument transformer. (2)

5. Brief the principle of digital phase meter. (2)

6. Write any two advantages and disadvantages of digital voltmeter. (2)

7. Explain the purpose of Schmitt trigger in digital frequency meter. (2)

8. Which torque is absent in energy meter? Why? (2)

9. What are the errors that take place in moving iron instrument? (2)

10. Explain the principle of analog type electrical instruments. (2)

11. How a PMMC meter can be used as voltmeter and ammeter? (2)

12. What is loading effect? (2)

13. State the basic principle of moving iron instrument. (2)

14. Why an ammeter should have a low resistance? (2)

15. Define the sensitivity of a moving coil meter. (2)

16. What are the precautions taken while using a DC voltmeter and DC Ammeter? (2)

17. What is the use of Multimeter? Write its advantages and disadvantages. (2)

18. Voltmeter has high resistance, why it is connected in series? (2)

19. What is an energy meter? Mention some advantages and disadvantages of energy

meter. (2)

20. What is meant by creep adjustment in three phase energy meter? (2)

PART – B

1. (i) Describe the construction and working of a permanent magnetic moving coil

instruments. (10)

(ii) Explain the design of three phase wattmeters and give the reactive power

measurement in 3 phase circuits. (6)

2. (i) How B-H curve is determined for a ring specimen. (8)

(ii) Explain the frequency measurement in Wien’s bridge (8)

3. Discuss why it is 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)

4. Explain the function of three phase wattmeter and energy meter. (16)

5. (i) Sketch the circuit and waveforms for ac voltmeter using a PMMC

Instrument and half wave rectifier. Explain the circuit operation. (10)

(ii) Develop the torque equation for a PMMC instrument and show its scale is linear (6)

6. (i) Discuss in detail the working of the successive approximation DVM.(8)

(ii) With a neat diagram, explain the various methods of magnetic measurements. (8)

7. (i) Explain with a neat sketch the construction and working principle of single-phase

induction type energy meter. (10)

(ii) How the range of d.c ammeter and d.c voltmeter can be extended?

Derive the expressions to calculate shunt resistance and multiplier resistance. (6)

8. (i) With a neat diagram explain the construction and working of electrodynamometer

type instruments. Also derive its torque equation. (10)

(ii) Explain with neat diagram the working of Linear ramp type DVM. (6)

9. (i) Explain the different methods of determination of B –H curve (8)

(ii) With block diagram explain the working principle of digital frequency meter. (8)

10. (i) Explain the working principle of moving iron instrument. (8)

(ii) Give a detailed notes on Instrument transformers. (8)

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