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1997 Course Industrial Instrumentation

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Total No. of Questions : 10] P1605 [Total No. of Pages : 02 [3764] - 1064 B.E. (Industrial Electronics) INDUSTRIAL INSTRUMENTATION (1997 Course) Time : 3 Hours] [Max. Marks : 100 Instructions to the candidates: 1) Answer any three questions from each section. 2) Answers to the two sections should be written in separate books. 3) Neat diagrams must be drawn wherever necessary. 4) Figures to the right indicate full marks. 5) Use of logarithmic tables, slide rule, Mollier charts, electronic pocket calculator and steam tables is allowed. SECTION - I Q1) a) b) Define the following: [10] i) Neutral zone. ii) Set point. iii) Proportional band. iv) Rate gain. v) Control Lag. Explain PID control for the temperature control application in detail. [8] Q2) a) b) Discuss different types of isolation circuits and compare. Describe the Ziegler - Nichol s method of tuning PID. [8] [8] Q3) a) b) With a neat sketch explain the operation of current to pressure converter.[8] In a proportional temperature control, input range is 4-20 mA and output varies from 40 C to 50 C. When input is 10 mA output is set at 35 C. When set point is changed to 37 C, input current required is 8 mA. Calculate proportional band of the controller. If the proportional band is adjusted to 120% how much is the input current required to set temperature at 38 C. Assume linear control. [8] P.T.O. Q4) a) b) Explain different types of lags in a process. Describe the selection criterion for the control valves. Q5) Write short notes (any three): a) Magnetic shielding and cabling. b) Ratio control system. c) ISO 9000-9001. d) Adaptive control. [8] [8] [16] SECTION - II Q6) a) b) Q7) a) b) Design a PD controller using Op-Amp. Derive the equation for the output. [8] Draw a PLC ladder diagram for the control of traffic signal lights. [8] With a neat block diagram explain the hardware of microprocessor based PLC. [8] With suitable example explain the significance of data acquisition control. [8] Q8) a) b) Explain the instrumentation involved in pollution control. Explain cascade control for controlling level in a tank. [8] [8] Q9) a) b) Give differences between RTD and thermocouple. With a neat sketch explain the construction of pneumatic valve. [8] [8] Q10)Write short notes (any three): a) Optical fiber in instrumentation. b) Actuator. c) Grounding and shielding. d) Supervisory control. EEE [3764]-1064 2 [18]

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