The Lapiace transform of a transportation Iag of 10 seconds is
As compared to an open loop system, a closed loop system is
Linear system obeys
The most commonly used input signal(s) in control system is/are
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 open-loop 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
The main difference between an open-loop system and a closed-loop system is that the closed-loop system has the ability to self-correct while the open-loop system doesn't. Consequently, closed-loop systems are often called feedback control systems while open-loop systems are also known as non-feedback controls.
Match List-I with List-ll and select the correct answer using the codes given below the lists:
A. Immersion rod
B. Air conditioner
C. Automatic washing machine
D. Automatic control of traffic
1. Open loop control system
2. Closed loop control system
3. Neither a closed loop nor an open loop 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.
The control system which operates on the time basis is an open loop system. For example, in automatic control of traffic, the time for each lamp (red, yellow and green) is fixed. The operation of each lamp does not depends upon the density of the traffic but depends upon the fixed time. Hence, assertion is true.
Reason is also true but, it is not the correct explanation of assertion.
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