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Seat No.: Enrolment No.
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GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER-VIII(NEW) EXAMINATION - SUMMER 2019
Subject Code:2182604 Date:17/05/2019
Subject Name:Automation & control in Rubber Industries
Time:10:30 AM TO 01:00 PM Total Marks: 70
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Instructions:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Draw figures wherever necessary
- Figures to the right indicates full marks.
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Q.1 (a) Define the given terms:(i) Dead Zone (ii) Drift (iii) Dynamic Error
(b) Explain the classification of instrument according to it’s function.
(c) Discuss in detail about circular chart recorder. Which process variables of rubber industries are recorded by it?
Q.2 (a) Which characteristic features would be included in rubber extruder instrumentation?
(b) List different types of sensors used to carry out the temperature measurement in rubber extruder. Write on any two.
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(c) Write down the different types of sensors used to carry out the gauge measurement in rubber calendering process. Write on any two.
OR
Q.2 (c) Give the principle sources of variations in calendered gauge. Discuss any one.
Q.3 (a) Give examples of industrial thermocouples used in rubber industries.
(b) List various types of elastic pressure transducer. Write on any one.
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(c) Discuss in detail about,construction and working of strain gauge load cell.
OR
Q.3 (a) Draw various configurations of thermistors.
(b) Explain any one method to carry out pressure measurement under vacuum.
(c) Discuss in detail about the construction and working of in-line stationary torque transducer.
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Q.4 (a) List out the terms which are used in controlled configurations.
(b) Define the term ‘time constant’. A mercury thermometer of first order characteristics take 5 seconds to indicate 70% of final temperature. Calculate time constant of thermometer.
(c) Which softwares are used in data acquisition and analysis in rubber industries? Write in brief on any two.
OR
Q.4 (a) Write in brief on comparator.
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(b) A mercury thermometer of first order characteristics having time constant of 4.5 seconds. Calculate the time needed to indicate 75% of the final temperature.
(c) Discuss about the errors in data acquisition and analysis in rubber industries.
Q.5 (a) Give the advantages of pneumatic controller.
(b) Explain the servo problem with suitable example.
(c) A unit step change in error is introduced into a PID controller. If Kc=10, Ti=1 and TD=0.5, plot the response of controller against time.
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OR
Q.5 (a) Write a brief note on transmission lines.
(b) Explain the regulatory problem with suitable example.
(c) A PID controller is at steady state with an output pressure of 10Psi. The set point and pen point are initially together. At time t=0, the set point is removed away form the pen point at rate of 0.5inch/minute. The motion of the set point is in the direction of lower readings. If the knob settings are K=2Psi/inch of pen travel, Tr=1.5 mins, and Tp=0.5. Plot the graph of output pressure vs. time
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