MU Instrumentation Engineering (Semester 3)
Transducers - 1
December 2014
Total marks: --
Total time: --
INSTRUCTIONS
(1) Assume appropriate data and state your reasons
(2) Marks are given to the right of every question
(3) Draw neat diagrams wherever necessary

1 (a) State True/False and justify-Bimetallic thermometer is unsuitable if the temperature changes are rapid.
5 M
1 (b) What do you mean by calibration? What is the need of calibration?
5 M
1 (c) The output of LVDT is connected to a 5V Voltmeter through an amplifier whose amplification factor is 250. An output of 2mV appears across the terminals of LVDT when the core moves through a distance of 0.5 mm. Calculate the sensitivity of LVDT.
5 M
1 (d) Write the criteria to be considered while selecting transducers.
5 M
1 (e) Explain Absolute humidity and relative humidity.
5 M

2 (a) Explain the flapper nozzle system and write its applications.
10 M
2 (b) Discuss the role of National Physical Laboratory in metrology. Write its advantages and disadvantages.
10 M

3 (a) Describe a rotational speed measurement system.
10 M
3 (b) Explain the following with respect to RTD -
i) Working principle
ii) Construction
iii) Materials used
iv) Self heating effect
10 M

Solve any two questions from Q4 (a), Q4 (b), Q4 (c).
4 (a) Explain the law of intermediate temperature and law of intermediate metals in case of thermocouple and give its significance.
10 M
4 (b) State different types of pyrometers. Explain with a neat sketch any one of them.
10 M
4 (c) Explain with a neat schematic diagram how the capacitance probe can be used for level measurement of non-conducting and conducting liquids.
10 M

5 (a) A thermistor has a resistance of 3980 Ω at the ice point (0°C) and 794 Ω at 50 °C. The resistance temperature relationship is given by RT=a R0 exp (b/T).
i) Calculate the constants a and b
ii) Calculate the range of resistance to be measured in case the temperature varies from 40°C and 100°C.
10 M
5 (b) Explain any five static characteristics of transducer with suitable example.
10 M

Write short notes on:
6 (a) Solid level detectors.
10 M
6 (b) Cold junction compensation in thermocouples.
10 M

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