Control Engineering — Winter 2021

Write Requirements of a good control system. Critically compare Open loop and Closed loop systems. Is an automatic electric iron an open loop or closed loop control system?

Justify the following statements if true: (1) Feedback control systems are also referred to as closed–loop systems. (2) Fixed-time traffic light control system is an example of closed loop control system. (3) In a multivariable control system there is one input variable but variable outputs.

What is mathematical modeling? Explain the steps for mathematical modeling of any physical system.

Reduce block diagram as shown in Fig. 1 and obtain overall transfer function.

Derive a transfer function for a liquid level system. Explain resistance and capacitance of any liquid level system.

Explain and derive the transfer function for an armature controlled D.C. motor.

What is Transfer function? Obtain the transfer function of a liquid level system. Explain resistance and capacitance of any liquid level system.

What is a signal flow graph? What are Properties of signal flow graph? State explain Mason’s gain formula for signal flow graph.

What does a block diagram represent? Explain it in detail. List its salient characteristics. Explain the following: Summing point, takeoff point.

Draw a schematic diagram & block diagram for a hydraulic proportional plus derivative control system. Derive expression for transfer function for above mentioned hydraulic PD control systems. Explain how this can be converted to PID controller

Write short note on : control systems for thermal power plant OR1

Compare hydraulic control system with pneumatic control system in detail. State the different applications of pneumatic control system.

List the basic types of control actions and explain the PDI control action in detail.

Explain the transient response of second order system.

Explain the concepts of fuzzy logic and fuzzy control systems.

Explain unit step response of first order linear time invariant systems.

Define programmable logic controller. What are the components of PLC? State the Advantages & Disadvantages of it.