# Measurements and Instrumentation 3rd ND11 131301

B.E./B.Tech. DEGREE EXAMINATION, NOVEMBER/DECEMBER 2011.
B.E – Electrical and Electronics Engineering
Third Semester
131301 - MEASUREMENTS AND INSTRUMENTATION
(Regulation 2010)

Programming Questions  |  Travel Tips | Mobile Review | Placement Papers

PART A — (10 ´ 2 = 20 marks)

1. Define gross error with an example.
2. A meter reads 127.50 V and the true value of the voltage is 127.43 V determine the static error correction for this instrument.
3. Find the angle between the voltage and current when the readings of two watt meters are 2000 W and 500 W.
4. Mention any two advantages of Moving Iron Instruments.
5. Mention the applications of AC potentiometers.
6. Why the earth pin in the 3 pin socket is larger is size?
7. Mention any four important specifications of CRO.
8. What are the disadvantages of magnetic tape recorder?
9. What is meant by smart sensors?
10. What are the applications of LVDT?

PART B — (5 ´ 16 = 80 marks)

11. (a) (i) Draw the fundamental block diagram of the analog and digital instrumentation systems and explain each block in details. (14)
(ii) Classify the static characteristics. (2)
Or
(b) (i) Explain the secondary standard of emf (Westoncell) with necessary diagram. (8)
(ii) Classify and explain the various types of errors. (8)

12. (a) (i) Explain the principle of dual slope integrating type digital voltmeter with neat diagram. (10)
(ii) Compare and contrast the analog and digital meters. (6)
Or
(b) (i) Explain the construction of single phase energy meter. (8)
(ii) Explain the principle of Vibrating reed frequency meter in detail. (8)

13. (a) (i) Explain with necessary diagram how the resistance can be measured using the D.C. potentiometer. (6)
(ii) How the power can be measured using self balancing bridge explain with necessary diagram? (10)
Or
(b) (i) What are the methods available for reducing earth resistance? How to measure earth resistance and soil resisitivity? (8)
(ii) Write short notes on electrostatic interference and electromagnetic interference. (8)

14. (a) With neat diagram explain the principle of operation of Digital CRO with sampling methods in detail. (16)
Or
(b) (i) Compare the LED and LCD display. (6)
(ii) Explain the working of Dot matrix printer. (10)

15. (a) (i) Explain the active and passive analog and digital transducers. (6)
(ii) Explain the principle of capacitive level sensor. (6)
(iii) What are the applications of piezoelectric transducer? (4)
Or
(b) (i) Explain the principle of successive approximation type ADC with neat sketch. (8)
(ii) What is data acquisition system? Explain the various types of signal conditioning in DAS. (8)