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# 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

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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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