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Seat No.: Enrolment
GUJARAT TECHNOLOGICAL UNIVERSITY
PDDC SEMESTER VII- EXAMINATION SUMMER 2017
Subject Code: X71904 Date: 05/05/2017
Subject Name: Control Engineering
Time: 02.30PM to 05.00PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
Q.1

With the help of suitable examples discuss open loop and closed loop control system.
07

Draw equivalent mechanical and electrical system to relate force voltage or force current analogy.
07
Q.2

Define the various terms used for specifying the transient response of a control system. Explain them on the response curve of any one of test signal.
07

Draw schematic block diagram for control of D.C motor and derive its transfer function.
07
OR

What do you mean by micro-processor based digital control. What is PLC? State its industrial applications.
07
Q.3

Reduce block diagram as show in figure 1 and obtain overall transfer function
07

Determine the stability of the following equation
S5 S4 2S3 2S2 3S 5 0
07
OR
Q.3

For figure 2 find overall transfer function. Solve using masons rule.
07

With the help of a neat sketch explain the working of a pneumatic nozzle flapper amplifier and hence determine its transfer function.
07
Q.4

What are the basic components of a hydraulic system? Explain any three of them.
07

Compare between hydraulic and pneumatic control system.
07
OR
Q.4

With a schematic diagram explain a hydraulic lift.
07

What is the main function of a pressure relief valve? Explain the constructional details of a pressure relief valve with neat sketch.
07
Q.5

Write a short note on 'Digital to Analog converter'.
07

Draw and explain detail block diagram of fuzzy logic controller.
07
OR
Q.5

Define.
Rise time, Delay time, Peak time, Maximum overshoot, Steady state error.
07

Explain boiler feed control system using neat sketch.
07
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Figure.1 Q.3(a)
Figure.2 Q.3(a) OR