THAPAR UNIVERSITY PROCESS INSTRUMENTATION & CONTROL,UCH506 DEC. 2014 PAPER Electronics and Communication Engineering (ECE) Notes | EduRev

Electronics and Communication Engineering (ECE) : THAPAR UNIVERSITY PROCESS INSTRUMENTATION & CONTROL,UCH506 DEC. 2014 PAPER Electronics and Communication Engineering (ECE) Notes | EduRev

 Page 1


Thapar University, Patiala 
Department of Chemical Engineering 
END SEMESTER TEST 
UCH 506: Proc 
1 
al controller. 
d transfer function, show 
troller. 
f time constant t, and a 
e control loop. 
6 
6 
6 
le diagram for the 
	 6 
B.E.(Chemical) (5th Semester) 
Date: 19 Dec-2014 
Time: 03 Hours; MM: 36 
s Instrumentation & Control 
Day: Friday 
Name of Facul : Alok Gar 
Note: Attempt all questions. Assume any missing (relevant) data. 
5e-35  
Find Y(t) if 
Y(s) = 	 , 
sketch Y(t) and find Y(t) for t =0, 2, 3. 
s(s+ 
2)(s+ 4) 
4.5, 5.5 and co. 
2 
3 
An ideal controller had the transfer function 
= KC(TDS + 1). 
An actual PD controller had the transfer function 
(TDS+1) 
= K C 	 , 
Where 13 is a large constant in an industr 
(..D /13)s+1  
If a unit step change in error is introduced into a controller having the secoi 
that 
P(0= K
c(1+ Ae
—fl tIrD) 
Where A is a function of J3 which you are to determine. 
For 13= 5 and K
e 
 = 0.5, plot 
P(t) vs 
t/TD. 
As 13 	 oo, show that the unit step response approaches that for the ideal coil 
A PD controller is used in a control system having a first-order 
	 ss proc 
first-order measurement lag with time constant 
'rm. 
There is no other lag e 
in t (a) 
Find the expression for and t for the closed-loop response. 
(b) 
If tt= 2 min, Trn = 20 sec, TD = 6 sec, find K
c 
 so that = 0.7. 
(c) 
For a servo problem, find the offset animilma
nimmesine  
14 	 - 
A system with two-tank, liquid level (T1 = 20 and 
t2 
= 10) having PID contr 
gain = Kc) and a first-order measuring lag (t, = 0.5). Plot the root locus dia 
of KC so that the system will be unstable. 
Plot the asymptotic 
amplitude ratio and phase angle versus frequency 
Bo 
1 
G(s)= 
s(s+1) 2(0.1s +1) 
Label corner frequency and give slopes of asymptotes. 
Explain the following: 
(a) 
Calibration of Instruments 
(b) 
Three methods of measurement of temperature 
c T es of Manometers 
Note: 
Evaluated answer sheets will be shown on 24-12.2014 in my office fro 10:00 to 11:00 AM. 
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