PART – AAnswer ALL the questions. Choose the correct answer: (20x1=20)

ANSWER1. In measurement systems, which of the static characteristics are desirable:

a) Accuracy b) Sensitivity c) Reproducibility d) All of the above

2. A pressure guage is calibrated from 0 to 50 kN/m2. It has uniform scale of 100 scale divisions. One fifth of a scale division can be read with certainty. The gauge has a:

a) Resolution of 0.1 kN/m2 b) Threshold of 0.1 kN/m2

c) Dead zone of 0.2 kN/m2 d) Resolution of 0.5 kN/m2

3. The sensitivity of a moving coil galvanometer is large if a) the magnetic field is small b) the area of the coil is small c) the torsional constant of the suspension strip is small d) number of turns of the coil is small.

4. A set of readings has a wide range and therefore it has:a) Low precision b) High precisionc) Low accuracy d) High accuracy

5. Electrostatic type instruments are primarily used asa) Ammeters b) Wattmetersc) Voltmeters d) Ohmmeters

6. Which instrument has the highest frequency range with accuracy within reasonable limits?a) Moving Iron b) Thermocouplec) Electrodynamometer d) Rectifier

7. The turn on and turn off times of a LCD are the order of a) 1 s b) 1 msc) 10 ms d) 10 ns

8. LEDs emit light a) Only in red color b) Only in green colorc) Only in amber color d) in red, green, yellow and amber color

9. Digital instruments have input impedance of the order ofa) Ω b) kΩc) MΩ c) mΩ

10. In spring controlled moving iron instruments, the scale isa) Uniformb) Cramped at lower end and expanded at upper endb) Expanded at lower end and cramped at upper endd) Cramped both at lower end and upper end

11. In a digital voltmeter, ‘over-ranging’ implies switchinga) OFF (1/2) digit b) ON (1/2) digitc) ON next 4 digits d) ON an indicator.

12. Measuring range of voltmeter can be extended by usinga) High shunt resistance b) Low shunt resistancec) High series resistance d) Low series resistance

13. The source of emission of electrons in CRT is:a) PN function diodeb) A barium and strontium oxide coated cathode

c) Accelerating anodesd) Post-accelerating anodes

14. Oscilloscopes can be used toa) View the shape of voltage waveformsb) Measure voltage over a period of time.

c) Measure resistance.d) Both a and b

15. In CRO sawtooth voltage is applied at thea) Horizontal deflecting plates b) Vertical deflecting platesc) Accelerating anode d) Cathode

16. The ‘Signal voltage’ to be observed _______________ a) is applied to the X-plates of CRT b) is applied to the Y-plates of CRTc) is applied to the control grid of CRTd) provides intensity control

17. The output voltage of a typical thermocouple isa) less than 100 mV b) greater than 1 Vc) Thermocouples vary resistance d) None of the above

18. What device is similar to an RTD but has a negative temperature coefficient?a) Strain gauge b) Thermistorc) Negative-type RTD d) Thermocouple

19. What is the moving part of a linear variable differential transformer?a) Primary b) Secondaryc) Diaphragm d) Core

20. Which of the following is a digital transducer?a) Strain gauge b) Encoderc) Thermistor d) LVDT

PART – BAnswer ALL the questions: (10x2=20)

21. What are the different systematic errors?22. List out the major parts of D’Arsonval galvanometer23. Define RMS24. What is meant by rectifier?25. What are the advantages of DVM?26. Define LED27. What is delay line?28. What is the role of vertical and horizontal deflection system in CRO?29. What is piezoresistive effect?30. Whether LVDT is an active or passive transducer? and justify your answer

PART – CAnswer ALL the questions: (3x5=15)

31. a) What is meant by environmental error and how it can be avoided?(or)

b) How the data was displayed in Liquid Crystal Display

32. a) Explain Lissajoues method for frequency determination(or)

b) List out the factors to be considered for selection of transducer

33. a) Explain Series type ohm meter(or)

b) Explain Chopper Stabilized AmplifierPART – D

Answer any THREE questions: (3x15=45)34. A circuit was tuned for resonance by eight different students, and the values of resonant

frequency in kHz were recorded as 532, 548, 543, 535, 535, 546, 531, 543 and 536. Calculate (a) arithmetic mean, (b) deviations from mean, (c) the average deviation, (d) standard deviation, and (e) variance.

35. Explain with neat diagram DC voltmeter with its sensitivity and loading effect 36. Discuss Electronic multimeter in detail37. Explain the operation of Cathode Ray Oscilloscope with its block diagram38. Explain with neat diagram Venturi tube and orifice plate for flow measurement