Download GTU BE/B.Tech 2018 Winter 5th Sem New 2151402 Food Process Instrumentation And Control Question Paper

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GUJARAT TECHNOLOGICAL UNIVERSITY

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

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Subject Code: 2151402 Date: 16/11/2018

Subject Name: Food Process Instrumentation & Control

Time: 10:30 AM TO 01:00 PM Total Marks: 70

Instructions:

1. Attempt all questions.

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2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
4. Use pencil to draw the diagram.

Q.1

1. (a) Draw the neat sketch of the elements used in pressure measuring devices. 03

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2. (b) Discuss different parts of mercury in glass thermometer with diagram. 04
3. (c) What are transducers? Explain active and passive transducers. Discuss different factors to be kept in mind for the selection of transducers. 07

Q.2

1. (a) Define Process variables, Linearity, Precision and Hysteresis 03
2. (b) Draw the neat sketch with pencil of the followings 04
   1. Bimetallic and Helical strip

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   2. Capacitance type level gauge
3. (c) Find Laplace transform of f (t) = sin(at) for t > 0 07

OR

1. (a) Explain the working principle of McLeod gauge with diagram. 03

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2. (b) Discuss the advantages and disadvantages of mercury and alcohol as a thermometric liquid. 04
3. (c) State dynamic properties of measuring instruments and explain any two of them in detail. 07

Q.3

1. (a) Explain resistance strain‘gauges. Discuss application of strain gauges. Explain working of Wheatstone Bridge circuit for resistance strain gauge-based measurement. 03

OR

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1. (a) Define the followings: 04
   1. Static Error
   2. Dynamic Error
   3. Random Error
2. (b) Describe the working of the followings 07
   1. Constant volume thermometer

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   2. Target flow meter

Q.4

1. (a) Describe Bode Plot and explain about stability condition of Bode plot. 03
2. (b) What do you mean by transducer? Explain selection criteria of transducer. 04

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3. (c) Why viscosity is important in food industry? Explain the working principle of Rotameter type viscometer. 07

Q.5

1. (a) Explain standard equation for first order system and derive system response for unit step input on first order system. 03

OR

1. (a) Give classification of various types of Control Valves used in process control. 04

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2. (b) Differentiate between the followings: 07
   1. Sensor and transducer
   2. Active and passive transducer

Q.4

1. (a) What do you understand by direct and indirect method of liquid level measurement? Discuss float gauge and purge method in detail with diagram. 03

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2. (b) Justify how can be a capacitive transducer used for level measurement application. 04
3. (c) Differentiate between balanced and unbalanced bridge with diagram. 07

Q.5

1. (a) Write in detail about feed forward control system. 03

OR

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1. (a) Draw and explain block diagram of close loop control system with an example. 04
2. (b) List out the advantages and disadvantages of thermocouple. Define See Beck and Peltier effect. 07
3. (c) Discuss different industrial methods of specific gravity measurement. Explain working of hydrometer and LVDT type hydrometer with diagram. 07

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