What is the automatic control system?
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Description : Draw and explain schematic of PLC based automatic car parking barrier system.

Answer : Explanation: Automatic car parking system allow to park maximum numbers of car in parking zone according to size of parking zone. parking zone number of vehicle parked in parking zone is less ... available parking space then automated parking system does not allow enter next car in parking zone. 

Description : What are the advantages of open loop control system?

Answer : Open loop control system are simple to design. Open loop control system are generally stable.

Description : Draw the labeled block diagram of process control system and explain each block.

Answer : Explanation - Process control system consists of process or plant, sensor, error detector, automatic Controller, actuator or control element. 1) Process or plant- process means some manufacturing sequence ... process which changes the process variable. Output of this block is denoted by u .

Description : A differentiator is not usually used in control system, because it : - (A) reduces damping  (B) increases error  (C) reduces gain margin  (D) increases input noise

Answer : A differentiator is not usually used in control system, because it : - increases input noise

Description : A unity negative feedback control system is found to have a gain margin of 20 dB. The Nyquist plot of the system (A) crosses the real axis at +0.1 (B) crosses the real axis at -0.1. (C) crosses the imaginary axis at -0.1 (D) crosses the imaginary axis at +0.1

Answer : A unity negative feedback control system is found to have a gain margin of 20 dB. The Nyquist plot of the system crosses the real axis at -0.1.