As compared to an open loop system, a closed loop system is:
Open loop system always follows the input but closed loop system always reduces the error irrespective of the input applied. So closed loop system is more accurate but less stable.
Linear system obeys:
Linear system obeys both reciprocity theorem and principle of maximum power transfer.
The most commonly used input signal(s) in a control system is/are:
A step function is commonly used as a input signal in a control system because:
Step Function:
The Laplace transform of a transportation Iag of 10 seconds is:
Consider the following statements regarding control systems:
1. In open loop control system, the control action depends upon the desired output.
2. All control systems operated by present timing mechanism are open loop.
3. in a closed loop control system feedback signal is usually negative.
4. In openloop control system stability cannot be ensured.
Q. Which of the above statements are correct?
Assertion (A): Closed loop control systems are known as feedback control systems.
Reason (R): In closed loop control systems, the control action is dependent on the desired output.
As compared to a closed loop system, an open loop system is:
Which of the following are the not characteristics of the closed loop systems?
Feedback refers to the comparison of the final output to the desired output at respective input so as to get an accurate and errorfree results and in the system improves the transient response of the system.
Assertion (A): The control system which operates on the time basis is an open loop system.
Reason (R): A field control d.c. motor is an example of open loop system.
A ramp function occurs at t = a. It's Laplace transform is:
Ramp function occurring at t = 0 is denoted by r(t) = tu(t).
Ramp function occurring at t  a will be denoted:
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