process technology

Q1. On-off control is a particular case of [+ provide explanation] (1 mark) A. Proportional-integral-derivative control B. Proportional-derivative control C. Proportional-integral control D. Proportional control Q2. The transfer-function of a transportation lag (time delay) is [+ provide explanation] (1 mark) A. e6 B. en C. 1/(s+1) D. none of the above answers Q3. The transfer function of a process is 1/(16s2+8s+4). If a step change is introduced into the system, then the response will be [+ provide explanation] (1 mark) A. Under damped B. Critically damped C. Over damped D. None of these Q4. Block diagram of a simple standard control system is shown below in the figure. Which of the following statement about the above control system is wrong? [+ provide explanation] (1 mark) A. The transfer functions of the measuring element and the process is represent by H and G2 respectively B. The overall transfer function for the change in load (X=0) is given by Y/X1= (Gc,G1,G2)(1+Gc,G1,G2,H) C. The overall transfer function for the change in set point (X1=0) is given by YXX= (Gc,G1,G2)(1+Gc,G1,G2,H) D. Manipulated variable is represented by C