Control systems question bank

  • Why negative feedback is preferred in the control system?

    Negative feedback reduces the overall gain of the system, with the degree of reduction being related to the open-loop gain.
    Negative feedback reduces distortion noise, sensitivity to external change, as well as improves the system bandwidth and input and output impedance..

  • An open-loop control system is a system in which the output is controlled by adjusting the input.
    In an open loop system, the control variable is set beforehand and doesn't take the system output into account.
    This means that the system output is not monitored or adjusted based on feedback from the output.
a. Compare open loop and closed loop control systems based on different aspects QUESTION BANK 2020-21. CONTROL SYSTEMS. Page 7. Q.3 a. Define and derive the 

How to design a control system?

The time domain specifications needed to design a control system are:- 1

Rise time, tr 2 Peak overshoot, Mp 3 Setting time, ts 4 Damping ratioζ 5

Natural frequency of oscillation, ωn 93

Write the necessary frequency domain specification for design of a control system

1 Phase margin 2 Gain margin 3 Resonant peak 4 Bandwidth 94

What are the two types of control system?

The two major types of control system are open loop and closed loop 37

Define open loop control system

The control system in which the output quantity has no effect upon the input quantity are called open loop control system

This means that the output is not feedback to the input for correction

38 Define closed loop control system

What is a feedback control system?

A feedback control system has the inherent capability that its parameters can be adjusted to alter both its transient and steady state behavior

16 Define type of a system

(April/May 2008) The number of poles of the loop transfer function lying at the origin decides the type number of the system

17

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