Download GTU BE/B.Tech 2018 Winter 5th Sem New 2150504 Instrumentation And Process Control Question Paper

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Subject Code: 2150504

GUJARAT TECHNOLOGICAL UNIVERSITY

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BE - SEMESTER-V (NEW) EXAMINATION - WINTER 2018

Subject Name: Instrumentation & Process Control

Time: 10:30 AM TO 01:00 PM

Instructions:

1. Attempt all questions.

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2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.

Q.1

1. (a) State and Prove final and initial Value theorem. (03)
2. (b) Derive the transfer function of U-tube manometer system. (04)

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3. (c) Derive the equation of unit step response for critically damped second order system. (07)

OR

1. (a) What do you mean by transportation lag? (03)
2. (b) What is first order system? Describe dynamic response of first order lag system to unit step change. (04)
3. (c) Derive the transfer function of mercury thermometer. Determine the response of mercury thermometer for step function and also mention the important features of step response. (07)

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Q.2

1. (a) A thermometer having a first order dynamic with a time constant 1 min is place in a temperature bath at 100°F. After the thermometer reaches steady state it is suddenly placed in a bath at 110°F at t = 0 and left there for 1 min, after which it is immediately returned to the bath at 100°F. Calculate the thermometer reading at 2 min. (07)
2. (b) Explain Servo and Regulator control with suitable examples. (03)
3. (c) Solve the following by using Laplace Transforms: d³x/dt³ - 4 d²x/dt² - 4x = 0; x(0)=0 x'(0)=0 x"(0)=0 (04)

OR

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1. (a) Derive overall transfer function for two tanks connected in series Non-interacting system. (07)
2. (b) With neat sketch explain the importance of transfer function. (03)
3. (c) Draw the general block diagram of a simple control system with positive feedback and explain each term. (04)

Q.3

1. (a) Solve the following by using Laplace Transforms: d³x/dt³ - d²x/dt² - 2 dx/dt - 2x=4+e^-t; x(0)=1 x'(0)=0 x"(0)= -1 (07)

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2. (b) Draw the P and I diagram of distillation column. (03)
3. (c) Discuss the transfer function for PID controller. (04)

OR

1. (a) Sketch the Root locus diagram for the control system. G(s) = Kc/s(s+1)(s+2) (07)
2. (b) Discuss the transfer function for P controller. (03)

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3. (c) What are Bode diagrams? Explain the graphical rules for Bode diagrams. (04)

Q.4

1. (a) Explain Bellow Pressure gauge for the Pressure measurement. (03)
2. (b) Describe the bubbler system for liquid level measurement with neat sketch. (04)
3. (c) Explain working and construction of bimetallic thermometers. (07)

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OR

1. (a) Classify the pressure measuring instruments. (03)
2. (b) Explain any two Static and dynamic characteristics of an instrument. (04)
3. (c) Explain principle, construction and working of rotameter. (07)

Date: 20/11/2018

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Total Marks: 70

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