FACULTY OF ENGINEERING B.E. 2/4 (Inst.) II – Semester (Old) Examination, December 2012 Subject : Transducer Engineering Time : 3 hours
Max. Marks : 75
Note: Answer all questions from Part-A. Answer any FIVE questions from Part-B. PART – A (25 Marks) 1. What are transducers? Give examples.
(3)
2. Define the terms : Threshold and hysterisis.
(2)
3. Define transfer function.
(2)
4. What is meant by piezo resistive effect?
(2)
5. What are the advantages of semiconductor strain gauges over metallic strain gauges? (3) 6. Differentiate between the operating principles of the thermistor and RTD.
(3)
7. What is Peltier effect?
(2)
8. List any four applications of capacitive transducers.
(2)
9. Mention the operating principle of a photodiode.
(3)
10. With reference to the capacitive tranducers, what is meant by differential arrangement? (3) PART – B (50 Marks) 11.a) Derive and explain the mathematical model of a series RLC circuit. b) What are standard test signals? Explain with figures. 12. Derive the frequency response for a first order system with a) unit step input and b) unit ramp input. 13.a) Give the constructional details of a potentiometer. b) A linear resistance potentiometer is 75 mm long and has a resistance of 10 KΩ. The slide is at the center of the potentiometer. Find the linear displacement if the resistance of the potentiometer is (i) 1190Ω (ii) 6051Ω.
(6) (4) (10) (5) (5)
14.a) Derive the expression for the gauge factor of a strain gauge. b) A strain gauge beam is 0.25 m long and has a cross-sectional area of 0.6x10-4 m2. The young’s modulus of steel is 207 GN/m2. The strain gauge has an unstrained resistance of 240 Ω and a gauge factor of 2.2. When the load is applied, the gauge resistance changes by 0.1 Ω. Calculate the change in length of the beam.
(6)
15.a) Explain the different types of thermocouple. b) Discuss the advantages and disadvantages of thermocouples.
(5) (5)
16.a) Discuss in detail, the working principle of an LDVT. b) What are the various applications of LVDT?
(7) (3)
17. Write short notes on : a) Hall effect sensor b) Piezoelectric transducer
Vasavai CE BE Inst. 2nd Year Dec 2012 Transducer Engineering.pdf
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