Type of Control System

Type of Control System


There are three basic types control system that are:

  • Feed Forward Control System
  • Open Loop Control System
  • Closed Loop or Feedback Controls System

Feed Forward Control System

  • Feed forward is a type of system which counters the changes in its surroundings.
  • It is used to maintain the wanted status of the system.
  • The biggest advantage of this system is that it does not permit the huge disturbance in the output.
  • The objective of feed forward control, also known as predictive control, is tom measure or predict and potential open-loop disturbances and compensate for them manually before the controlled variable devices too for from the original set point. 
Open Loop Control System


Definition: An open-loop control system is one where the control action is independent of the "output" or the desired result. In other words, the system does not use feedback to determine if the desired outcome has been achieved.

Operation: The system takes an input, processes it through a controller, and then drives the actuators to produce an output. The system does not measure or react to the output in any way to adjust the input or control action.

Characteristics:

  • No Feedback: The system does not have a feedback loop to monitor the output and make adjustments accordingly.
  • Pre-Set Control Actions: The control actions are predetermined and follow a fixed sequence regardless of the actual output or disturbances.
  • Simplicity: Open-loop systems are generally simpler and less expensive to design and implement compared to closed-loop systems.

Examples:

  • Washing Machines: A washing machine that runs for a pre-set time without sensing the cleanliness of the clothes.
  • Toasters: A toaster that toasts bread for a specific time period without checking the actual level of toasting.
  • Irrigation Systems: An irrigation system that waters plants based on a timer rather than the moisture level of the soil.

Limitations:

  • Lack of Accuracy: Since there is no feedback, the system cannot correct any errors or deviations from the desired output.
  • Susceptibility to Disturbances: Any changes in external conditions or disturbances can affect the performance without the system compensating for them.
Closed Loop or Feedback Control System

  • Closed loop control system is a control system where its control action depends on both of its input signal and output response.
  • Closed loop control also known as feedback control system.
  • Open loop control system can be converted into closed loop control system by providing a feedback. This feedback automatically makes the suitable changes in the output due to external disturbance.
  • In this way closed control loop control system is called Automatic control system.
  • Some example of Closed control system are:
    • Automatic Electric Iron, Water Level Controller
    • An air Conditioner, Missile Launched and auto tracked by Radar.




Qus. 1 : This output signal is feedback so that it subtract from the input signal

  1. Negative Feedback
  2. Positive Feedback
  3. Both A and B
  4. None of the Above
Qus. 2 : A system the utilize a device to control the process without using feedback

  1. Open-Loop control system
  2. Closed-Loop feedback control system
  3. Regulator
  4. All of above
Qus. 3 : A system that uses a measurement of the output and compares it with the desired output:

  1. Open-Loop control system
  2. Closed-Loop feedback control system
  3. Both A and B
  4. All of the above
Qus. 4 : It is control system that has only one input and one output

  1. SISO
  2. MIMO
  3. Both A and B
  4. None of the above
Qus. 5 : open loop control system is also referred as

  1. Feedback control system
  2. Non-Feedback control system
  3. Multiple Feedback control system
  4. Loop Feedback control system
Qus. 6 : Manual control system is Also Known as

  1. Open Loop control system
  2. Close Loop Control System
  3. Feedback Control System
  4. All of These
Qus. 7 : Bread Toaster is a Example of

  1. Open Loop Control System
  2. Closed Loop Control System
  3. Both Open and Close Loop Control System
  4. None of These
Qus. 8 : Automatic control system is Also Known As

  1. Open Loop or Feedback Control System
  2. Open Loop or Non Feed back Control System
  3. Closed Loop or Feedback Control System
  4. None of these
Qus. 9 : Closed loop control also known as

  1. Non-feedback control system
  2. Feedback control system
  3. Open Control System
  4. None of These
Qus. 10 : In which the control system action is totally independent of output of the system.

  1. Closed Loop Control System
  2. Open Loop Control System
  3. Feedback Control System
  4. All of above
Qus. 11 : Which of the following is not passive transducer?

  1. Thermistor
  2. Transformer
  3. Thermocouple
  4. Robot
Qus. 12 : During embedded design, which design considers both hardware and software

  1. Memory Design
  2. Software/ hardware Design
  3. Platform-based Design
  4. Peripheral Design
Qus. 13 : How can you throw an error with preprocessor directives to Arduino Compiler, forcing to stop compilation ?

  1. #warning
  2. #stop
  3. #cut
  4. #error
Qus. 14 : In IoT, Transport layer set up connections without handshakes/acknowledgements using:

  1. UDP
  2. TCP
  3. FTP
  4. HTTP
Qus. 15 : These applications take data or input from various devices and convert it into viable actions or clear patterns for human analysis

  1. Real Time Analytics
  2. Data Collection
  3. Device Integration
  4. Real Time Collection
Qus. 16 : Which of the following is NOT a data type?

  1. sbit
  2. dbit
  3. bit
  4. unsigned int
Qus. 17 : Closed Loop Control System has one or more ___________ between its output and input.

  1. Control loops
  2. Controller loops
  3. Feedback loops
  4. None of the above
Qus. 18 : Traffic light system is the example of :

  1. Open-loop system
  2. Closed-loop system
  3. Both A and B
  4. None of these
Qus. 19 : Which of the following is an open loop control system

  1. Field controlled D.C motor
  2. ward leonard control
  3. Metadyne
  4. Stroboscope
Qus. 20 : In closed loop control system, with positive value of feedback gain the overall gain of the system will ______

  1. decrease
  2. increase
  3. be unaffected
  4. none of the mentioned
Qus. 21 : In open loop system

  1. the control action depends on the size of the system.
  2. the control action depends on system variables.
  3. the control action depends on the input signal.
  4. the control action is independent of the output,
Qus. 22 : Which of the following is an open loop control system ?

  1. Field controlled D.C. motor
  2. Ward leonard control
  3. Metadyne
  4. Stroboscope

Programs

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