ELECTRONIC MEASUREMENT & INSTRUMENTATION

UTTARAKHAND TECH. UNIVERSITY

utu previous year question papers

B TECH (SEM III),2011-2012

SUB:- ELECTRONIC MEASUREMENT & instrumentation  

time : 3hr]

Total marks :100

SECTION A

Q1:- Attempt any four of the following :

1. Why springs are used in measuring instruments?
2. Why shunt resistance are used in an ammeter? How much its value should be?
3. If a voltmeter uses a meter with  I_Fs = 2 mA. Obtain its sensitivity.
4. In how many ways transducers can be classify?
5. What is working principle of piezoelectric transducers?
6. Explain the working principle and application of thermocouple.

SECTION B

Q2:- Attempt any two of the following :

1. List the advantages and disadvantages of a moving-iron instrument.
2. Draw the block diagram of digital frequency meter. Explain its principle of operation.
3. Difference between
   (i) Reproductivity and Drift
   (ii) Dead Zone and Hysteresis

SECTION C

Q3:- Attempt any two of the following :

1. Draw neat sketches showing position of electric resistance strain gauges, the bridge connection for max, output and full temperature compensation.What are the gauge factor and circuit sensitivity?
2.  Explain the working of Ohmmeter. Why shunts are used in series ohmmeter?
3. Compare and contrast the performance of successive approximation type ADC with that of counter type ADC.

SECTION D

Q4:- Attempt any two of the following :

1. Name four types of electrical pressure transducers and describe one application of each type.
2. For high temperature measurement, which technique is preferred and in what range? The resistance of a thermometer is 800 ohm at 50^oC and 4k ohm at the ice point. Calculate the characteristics constant (a,b) for the thermister and variation in resistance between30^oC and 100^oC.
3. What is use of dummy gauge? Explain that how they effect the output of a strain gauge bridge. A Strain gauge has a resistance of 120 ohm unstrained and the gauge factor is -12. What is the resistance value if the strain is 1%?

SECTION E

Q5:- Attempt any two of the following :

1. List the transducers which are essentially used for measuring very high temperatures. Also discuss their sensitivity and range of measurement.
2. Write in brief on display system. What are Numeric and Alpha number display using LCD and LED?
3. Differentiate between:
   (i) Dual-slope integrating method used in A/D converter and
   (ii) Electronic analog ohmmeter and multimeter.

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