Controller Tuning and Advanced Control - Instrumentation and Process Control - Chemical Engineering Previous Year Questions

1

2011 · Chemical Engineering · Instrumentation and Process Control · Controller Tuning and Advanced Control

Chemical Engineering (CH) 2011

The transfer function of the controller is

A

\(\frac{5(12s^2+4s+1)}{3s}\)

B

\(\frac{5(12s^2+3s+1)}{3s}\)

C

\(\frac{5(12s^2+4s+1)}{4s}\)

D

\(\frac{5(12s^2+3s+1)}{4s}\)

Open complete paper

2

2013 · Chemical Engineering · Instrumentation and Process Control · Controller Tuning and Advanced Control

Chemical Engineering (CH) 2013

For the computation of Ziegler-Nichols settings, the ultimate period (in s/cycle) and the ultimate gain are

A

\(\pi and 0.8, respectively\)

B

\(4\pi and 0.8, respectively\)

C

\(4\pi and 1.25, respectively\)

D

\(\pi and 1.25, respectively\)

Open complete paper

3

2014 · Chemical Engineering · Instrumentation and Process Control · Controller Tuning and Advanced Control

Chemical Engineering (CH) 2014

Integral of the time-weighted absolute error (ITAE) is expressed as

A

\(\int_{0}^{\infty} \frac{|\varepsilon(t)|}{t^2} dt\)

B

\(\int_{0}^{\infty} \frac{|\varepsilon(t)|}{t} dt\)

C

\(\int_{0}^{\infty} t |\varepsilon(t)| dt\)

D

\(\int_{0}^{\infty} t^2 |\varepsilon(t)| dt\)

Open complete paper

4

2014 · Chemical Engineering · Instrumentation and Process Control · Controller Tuning and Advanced Control

Chemical Engineering (CH) 2014

Given below is a simplified block diagram of a feedforward control system.
The transfer function of the process is \( G_p = \frac{5}{s+1} \) and the disturbance transfer function is \( G_d = \frac{1}{s^2+2s+1} \). The transfer function of the PERFECT feedforward controller, \( G_f(s) \) is

A

\(\frac{-5}{(s+1)^2} \)

B

\(\frac{-5}{(s+1)} \)

C

\(\frac{-1}{5(s+1)} \)

D

\(-5(s+1) \)

Open complete paper

5

2022 · Chemical Engineering · Instrumentation and Process Control · Controller Tuning and Advanced Control

Chemical Engineering (CH) 2022

The appropriate feedforward compensator, \( G_{ff} \), in the shown block diagram is

A

\(G_{ff} = \frac{2}{3} \frac{8s+1}{5s+1} \)

B

\(G_{ff} = - \frac{2}{3} \frac{8s+1}{5s+1} \)

C

\(G_{ff} = \frac{3}{2} \frac{5s+1}{8s+1} e^{-s} \)

D

\(G_{ff} = - \frac{3}{2} \frac{5s+1}{8s+1} e^{-s} \)

Open complete paper

6

2022 · Chemical Engineering · Instrumentation and Process Control · Controller Tuning and Advanced Control

Chemical Engineering (CH) 2022

Consider the tank level control system shown in the figure, where the cross-section area of the tank is A. Assume perfect flow controllers (FC). The level controller (LC) is proportional-integral (PI). For an integral time, τ_I, the level controller gain, K_c, is tuned for critical damping. The value of K_cτ_I/A is ______ (rounded off to the nearest integer).

Check answer

Open complete paper

7

2024 · Chemical Engineering · Instrumentation and Process Control · Controller Tuning and Advanced Control

Chemical Engineering (CH) 2024

Consider the block diagram in the figure with control input u, disturbance d and output y. For the feedforward controller, the ordered pair (K, α/β) is

A

(0.5, 2)

B

(−0.5, 0.5)

C

(−2, 2)

D

(2, 0.5)

Open complete paper

8

2026 · Chemical Engineering · Instrumentation and Process Control · Controller Tuning and Advanced Control

Chemical Engineering (CH) 2026

Consider three identical non-interacting first order processes in series, each having unit gain and a time constant of 2 min. Tuning of proportional controller using closed loop Ziegler-Nichols technique is considered. Which one of the following is the ultimate period of sustained cycling (in min per cycle)?

A

4√3π

B

√3π/4

C

4π/√3

D

π/(4√3)

Open complete paper