III Semester Diploma Examination, November 2009 E & C. Board, BASIC PROCESS INSTUMENTATION Question paper

Time : 3 Hours Max. Marks : 100

Instructions : 1. Section – I is compulsory
2. Answer any six full questions choosing two questions each from Section II, III and IV.

SECTION – I

1. (a) Fill in the blanks with appropriate word / words :
(i) The ___ is a curved metallic tube having an elliptical cross-section and sealed at one end.
(ii) A strain gauge is a passive transducer that converts a mechanical displacement into a change in ______
(iii) The thermistor is a short name for ____ .
(iv) Capacitive transducers are mainly used for ____ measurement.
(v) Piezo-electric transducers are ___ transducers.

(b) Explain the block diagram of Dead Weight Tester.

SECTION – II

2. (a) Explain the each block of generalized measurement system
(b) Define error and mention the types of error.
(c) Explain the static and dynamic characteristics.

3 (a) Explain zero order system with an example
(b) List the classification of electrical transducer.
(c) Explain in briefly : (i) Bellows (ii) Capsule

4. (a) Explain the working of LVDT displacement transducer.
(b) Explain the working principle of variable capacitance type displacement transducer.
(c) Define instrumentation.

SECTION – III

5. (a) Explain briefly unbounded train gauge with neat sketch.
(b) List the material used for the strain gauge.
(c) Mention the classification of electrical strain gauge.

6. (a) Explain the measurement of liquid level by capacitive probe method.
(b) What is level measurement? Explain Direct Method.
(c) What are the merits and demerits of mechanical strain gauge ?

7. (a) Explain the working of force-balance type pressure transducer with neat sketch?
(b) Explain the construction of Bourdon tube with neat sketch.
(c) Give the merits and demerits of potentiometric pressure transducer.

SECTION – IV

8. (a) Explain the principle of operation of
(i) Mechanical gauges & (ii) Optical gauges
(b) Explain the factors affecting strain measurements..
(c) Define gauge factor.

9. (a) Explain the working of optical pyrometer with neat sketch.
(b) Explain the construction of thermocouple with sketch.
(c) Explain piezoelectric pressure transducer.

10. (a) Explain the working of Radiation Pyometer with neat sketch.
(b) Explain the construction of Platinum Resistance Thermometer.
(c) Define temperature.