Jawaharlal Nehru Technological University Hyderabad 2005-1st Sem B.Tech Applied Electronics and Instrumentation Code No: RR311004 Set No.2 IIIRegular s,- PROCESS CONTROL INSTRUMENTATIO

Code No: RR311004 Set No.2
III B.Tech. I Semester Regular Examinations, November -2005
PROCESS CONTROL INSTRUMENTATION
( Common to Electronics & Instrumentation Engineering and
Instrumentation & Control Engineering)
Time: three hours Max Marks: 80
ans any 5 ques.
All ques. carry equal marks
? ? ? ? ?
1. (a) elaborate single capacity systems? provide 1 example and discuss why it is
called so?
(b) Write the dierential formula of this system and determine the transfer func-
tion.
(c) Study the response of this pure capacity system to a step change in input.
[5+5+6]
2. (a) Is the Thermometer Bulb and well arrangement a non-interacting system?
Justify your ans.
(b) Write the dierential equations and determine the transfer function for
Thermometer bulb and well arrangement. [6+10]
3. (a) discuss with a neat sketch depicting the fault vs controller output, the prin-
ciple of a proportional controller action.
(b) With an example, discuss how oset fault in proportional controller occurs.
Suggest a way to overcome the oset fault. [8+8]
4. (a) discuss in detail, the realization of proportional-integral action with the aid
of bellows, flapper-nozzle etc.
(b) Draw a 3 mode electronic controller and derive the expression for the
output voltage. [8+8]
5. (a) What is a optimum - tuning control? elaborate its dierent approaches?
(b) How are the interactions in control being channelized to optimize the control
action in a boiler? [8+8]
6. (a) A 4-20mA control signal is loaded by a 100-
resistor and must produce a
20-40 volt motor drive signal. obtain an formula relating the input current to
the output voltage.
(b) discuss with an example the need of signal conditioning system in the final
control operation. [8+8]
7. (a) Briefly discuss valve sizing.
(b) A fully open valve passes 200gpm of water at a pressure dierential of 10.0psi
compute valve sizing.
8. explain the design techniques related to multiple input and multiple output (MIMO)
control system?

Earning:   Approval pending.