GTU Industrial Automation - December 2014 Exam Question Paper

GTU Electrical and Electronic Engineering (Semester 7)
Industrial Automation
December 2014

Total marks: --
Total time: --

INSTRUCTIONS
(1) Assume appropriate data and state your reasons
(2) Marks are given to the right of every question
(3) Draw neat diagrams wherever necessary

1 (a) Draw a block diagram of a PLC showing the main functional items. Explaining the functions of each block, also.

7 M

1 (b) Define following terms with respect to Process control:
(1) Offset (2) Variable Range (3) Neutral Zone (4) Control Lag (5) Dead Time (6) Cycling (7) Error.

7 M

2 (a) What is a controller mode? Explain characteristics of two position and multi-position discontinuous controller modes.

7 M

Answer any two question from Q2 (b) or Q2 (c)

2 (b) Discuss the characteristics and applications of Proportional control mode.

7 M

2 (c) Discuss the characteristics and applications of PI composite control mode.

7 M

Answer any two question from Q3 (a), (b) or Q3 (c), (d)

3 (a) Explain ladder diagram elements and its applications.

7 M

3 (b) What kind of automation would you recommend for manufacturing? (Fixed/Flexible/Programmable): (1) Light bulbs (2) Garments (3) Textile (4) Cement (5) Printing (6) Toys (7) Pharmaceuticals.

7 M

3 (c) Explain Timer and Counter instructions with timing diagram for PLC.

7 M

3 (d) Explain Various types of Automation Techniques applied in Production Systems with suitable example.

7 M

Answer any two question from Q4 (a), (b) or Q4 (c), (d)

4 (a) What is DCS? Draw a hierarchical DCS structure and explain function of each level.

7 M

4 (b) Explain different types of displays in DCS.

7 M

4 (c) Explain the concept of networking in DCS. Also explain various network topologies.

7 M

4 (d) Explain in detail the input-output module used in PLC.

7 M

Answer any two question from Q5 (a), (b) or Q5 (c), (d)

5 (a) Define the variables in the system of Figure-1 that constitutes the process load.

7 M

5 (b) Develop a ladder diagram for temperature measurement and control system shown in Figure-2.

7 M

5 (c) Explain the three main components of SCADA.

7 M

5 (d) A controlling variable is a motor speed that varies from 800-1750 rpm. If the speed is controlled by a 25 to 50v dc signal, calculate (1) the speed produced by an input of 38v, (2) an input voltage require for speed 1446 rpm and (3) the speed calculated as a percent of span.

7 M

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