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2003 Course Process Instrumentation (Elective I)

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Total No. of Questions : 12] [Total No. of Pages : 3 [3764]-246 P1353 B.E. (Electronics) PROCESS INSTRUMENTATION (Elective - I) (2003 Course) Time : 3 Hours] [Max. Marks : 100 Instructions to candidates : 1) Answers to the two sections should be written in separate books. 2) Neat diagrams must be drawn wherever necessary. 3) Figures to the right indicate full marks. 4) Use of logarithmic tables slide rule, Mollier charts, electronic pocket calculator and steam tables is allowed. 5) Assume suitable data, if necessary. SECTION - I Q1) a) Draw the block diagram of a SMART TRANSMITTER with differential pressure signal as its input. Explain the function of each block. [10] b) With suitable example distinguish between SERVO problem and REGULATOR problem in process control. [6] OR Explain any four sensors used for pressure measurement with sketches. [12] Q2) a) b) Q3) a) Sensor resistance changes linearly from 100 ohm to 180 ohm as temperature changes from 20 C to 120 C. Find the relationship between resistance and temperature. [4] Define the following for a control valve. i) Actuator. ii) [8] Positioner. iii) Cavitation. iv) Flashing. b) Design a process control system that regulates light level by outputting 0-10V signal to a lighting system that provides 30-180 lux. The sensor has a transfer function of 120 ohm / lux with a 10 K resistance at 100 lux. The set point is 75 lux and proportional controller with a 75% proportional band has been selected. [8] P.T.O.

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