Process Control- Design, Analysis and Assessment MCQ

4) For a process with only time delay term. 1 point the frequency response shows 1) Controller parameters for the system 1 point 2e 25 G(S) = (103 - 1)(88 +1) is determined assuming the desired closed-loop time constant to be te=5 sec using direct synthesis approach. If the time delay is approximated using 19 order Taylor series approximation, the integral time constant (in seconds) for the controller is no phase lag but there is a magnitude change no change in magnitude but there could be a phase lag 05 both phase and magnitude change in output 10 Oneither phase nor magnitude change in output 18 08 5) Consider the processes given below. 1 point Choose the process which can be best approximated as a pure time delay process. Tank system with level as controlled variable 2) For a closed loop system, the delay to 1 point the plant is 1 second, the time constant of the plant is 5 seconds and the plant gain is 3.5. Approximate the delay by Taylor series expansion and evaluate the response to unit step Boiler with temperature of steam as controlled variable 3.5 - 4.211e-0.22 a very Temperature of water at the end long pipe in which water flows fast enough to neglect any effect of heat transfer O 12 13.432 0.22 O 0.7 -0.5e -0.21 Temperature of water in a solar heater operated during day time. O 0.778 - 3.112e-34 3) Using Gdce(s) = in direct 1 point synthesis design method, identify a PID controller structure for the system G(8) = 32 +138114 (Use first order Pade's approximation) 6) Using an appropriate Gden(s) in a 1 point direct synthesis design method, identify the controller structure for the system G(s) = -33-6. (Use first order Pade's 251-6 approximation). 10 Go(s) = 3 + 25 +1 S O K=1, T1 = 12 O G (s) = O Kc = 3,71 = 1,70 = 1 2 + 8 +3 s 1 O Kc = 6, TI = TD =1 Ge(s) = +2s + 3 O Kc = 7,1 = 3 Ge(s) = 8+1+ 1+ S