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.Read More

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