Feedback and Open-Loop Systems MCQ & Objective Questions
Understanding Feedback and Open-Loop Systems is crucial for students preparing for various exams. These concepts are not only foundational in engineering but also frequently appear in objective questions and MCQs. Practicing MCQs on these topics can significantly enhance your exam preparation, helping you score better by reinforcing your grasp of important questions and concepts.
What You Will Practise Here
Definition and characteristics of feedback systems
Types of feedback: positive and negative
Open-loop system characteristics and examples
Transfer functions and their significance
Stability analysis of feedback systems
Applications of feedback and open-loop systems in real life
Key formulas related to system responses
Exam Relevance
Feedback and Open-Loop Systems are essential topics in the curriculum for CBSE, State Boards, NEET, and JEE. Students can expect questions that test their understanding of system behavior, stability, and real-world applications. Common question patterns include multiple-choice questions that require students to identify system types, analyze system responses, and apply theoretical concepts to practical scenarios.
Common Mistakes Students Make
Confusing the characteristics of feedback and open-loop systems
Misinterpreting stability criteria in feedback systems
Overlooking the significance of transfer functions
Failing to apply real-life examples to theoretical concepts
FAQs
Question: What is the difference between feedback and open-loop systems? Answer: Feedback systems use output information to adjust inputs, while open-loop systems do not use feedback for control.
Question: How do I determine the stability of a feedback system? Answer: Stability can be assessed using methods like the Routh-Hurwitz criterion or Nyquist plots.
Now is the time to enhance your understanding of Feedback and Open-Loop Systems! Dive into our practice MCQs and test your knowledge to excel in your exams.
Q. In a closed-loop system, what role does feedback play?
A.
It increases the system's complexity.
B.
It helps to correct errors in the output.
C.
It makes the system unstable.
D.
It is not necessary for system operation.
Solution
Feedback in a closed-loop system is used to compare the actual output with the desired output, allowing for error correction.
Correct Answer:
B
— It helps to correct errors in the output.
Q. What does the root locus technique help to analyze?
A.
The frequency response of a system.
B.
The stability of a system as gain varies.
C.
The time response of a system.
D.
The transfer function of a system.
Solution
Root locus is a graphical method used to analyze how the roots of a system's characteristic equation change with varying gain, helping to assess stability.
Correct Answer:
B
— The stability of a system as gain varies.
Q. What is the significance of the time constant in a first-order system?
A.
It determines the system's stability.
B.
It indicates how quickly the system responds to changes.
C.
It is irrelevant to system performance.
D.
It defines the system's frequency response.
Solution
The time constant in a first-order system indicates how quickly the system responds to changes in input, with a smaller time constant indicating a faster response.
Correct Answer:
B
— It indicates how quickly the system responds to changes.
Q. Which of the following indicates a stable system in a Bode plot?
A.
The gain margin is positive.
B.
The phase margin is negative.
C.
The gain increases without bound.
D.
The phase crosses -180 degrees.
Solution
A stable system in a Bode plot is indicated by a positive gain margin, which means the system can tolerate some increase in gain before becoming unstable.
