Control Systems MCQ & Objective Questions
Control Systems play a crucial role in various engineering and science disciplines, making them an essential topic for students preparing for exams. Mastering this subject not only enhances your understanding but also boosts your confidence in tackling objective questions. Practicing MCQs related to Control Systems helps you identify important questions and solidifies your exam preparation, ensuring you are well-equipped to score better.
What You Will Practise Here
Fundamentals of Control Systems
Types of Control Systems: Open-loop and Closed-loop
Key concepts of feedback and stability
Transfer functions and their applications
Block diagrams and signal flow graphs
Time response analysis and performance metrics
Common control system components and their functions
Exam Relevance
Control Systems is a significant topic in various educational boards, including CBSE and State Boards, as well as competitive exams like NEET and JEE. Questions often focus on theoretical concepts, numerical problems, and application-based scenarios. Familiarity with common question patterns, such as identifying system types or analyzing stability, is essential for success in these assessments.
Common Mistakes Students Make
Confusing open-loop and closed-loop systems
Misunderstanding the concept of feedback and its effects
Errors in deriving transfer functions from block diagrams
Overlooking the significance of time response metrics
Neglecting to practice numerical problems related to stability
FAQs
Question: What are the main types of Control Systems?Answer: The main types are open-loop and closed-loop control systems, each serving different applications.
Question: How can I improve my understanding of Control Systems for exams?Answer: Regular practice of Control Systems MCQ questions and reviewing key concepts will enhance your understanding and retention.
Now is the time to take charge of your exam preparation! Dive into our collection of Control Systems MCQs and practice questions to test your knowledge and boost your confidence. Remember, consistent practice is the key to success!
Q. Which of the following indicates an underdamped system in a second-order transfer function?
A.
Damping ratio less than 0.
B.
Damping ratio equal to 0.
C.
Damping ratio between 0 and 1.
D.
Damping ratio greater than 1.
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Solution
An underdamped system has a damping ratio between 0 and 1, resulting in oscillatory behavior.
Correct Answer:
C
— Damping ratio between 0 and 1.
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Q. Which of the following indicates that a system is stable?
A.
All poles of the transfer function are in the right half of the s-plane.
B.
All poles of the transfer function are in the left half of the s-plane.
C.
Poles are on the imaginary axis.
D.
Poles are complex with positive real parts.
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Solution
A system is stable if all poles of its transfer function are located in the left half of the s-plane.
Correct Answer:
B
— All poles of the transfer function are in the left half of the s-plane.
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Q. Which of the following is a characteristic of a closed-loop control system?
A.
It does not require a reference input.
B.
It uses feedback to compare the output with the desired input.
C.
It is always faster than an open-loop system.
D.
It cannot handle disturbances.
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Solution
A closed-loop control system uses feedback to compare the actual output with the desired input, allowing for adjustments.
Correct Answer:
B
— It uses feedback to compare the output with the desired input.
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Q. Which of the following is a characteristic of a second-order underdamped system?
A.
No oscillations
B.
Oscillations with decreasing amplitude
C.
Oscillations with constant amplitude
D.
Instantaneous response
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Solution
A second-order underdamped system exhibits oscillations that gradually decrease in amplitude over time.
Correct Answer:
B
— Oscillations with decreasing amplitude
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Q. Which of the following is a characteristic of a stable system?
A.
All poles are in the right half of the s-plane.
B.
All poles are in the left half of the s-plane.
C.
Poles are on the imaginary axis.
D.
Poles can be anywhere in the s-plane.
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Solution
A stable system has all its poles located in the left half of the s-plane, ensuring that the system response decays over time.
Correct Answer:
B
— All poles are in the left half of the s-plane.
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Q. Which of the following is a characteristic of an open-loop control system?
A.
It requires feedback.
B.
It is less complex than closed-loop systems.
C.
It is always stable.
D.
It can automatically correct errors.
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Solution
Open-loop systems do not use feedback, making them generally less complex than closed-loop systems.
Correct Answer:
B
— It is less complex than closed-loop systems.
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Q. Which of the following is a common application of open-loop control systems?
A.
Temperature control in a furnace.
B.
Cruise control in vehicles.
C.
Washing machines on a fixed cycle.
D.
Robotic arms with sensors.
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Solution
Washing machines often operate on a fixed cycle without feedback, making them a typical example of an open-loop control system.
Correct Answer:
C
— Washing machines on a fixed cycle.
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Q. Which of the following is a disadvantage of open-loop systems?
A.
They are simple to design.
B.
They can be less expensive.
C.
They cannot correct for disturbances.
D.
They are always stable.
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Solution
Open-loop systems cannot correct for disturbances, making them less robust compared to closed-loop systems.
Correct Answer:
C
— They cannot correct for disturbances.
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Q. Which of the following is a key advantage of open-loop systems?
A.
Higher accuracy due to feedback.
B.
Simplicity and ease of design.
C.
Better stability in all conditions.
D.
Ability to adapt to changing conditions.
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Solution
Open-loop systems are simpler and easier to design since they do not require feedback mechanisms.
Correct Answer:
B
— Simplicity and ease of design.
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Q. Which of the following is NOT a characteristic of a closed-loop control system?
A.
Feedback
B.
Reference input
C.
Open-loop control
D.
Control action
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Solution
Open-loop control is not a characteristic of closed-loop systems, which rely on feedback to adjust control actions.
Correct Answer:
C
— Open-loop control
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Q. Which of the following is NOT a characteristic of a first-order system?
A.
It has one energy storage element.
B.
It has a single pole.
C.
It exhibits exponential response.
D.
It can oscillate indefinitely.
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Solution
First-order systems do not oscillate indefinitely; they have a single pole and exhibit an exponential response without oscillations.
Correct Answer:
D
— It can oscillate indefinitely.
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Q. Which of the following is NOT a characteristic of closed-loop systems?
A.
They can automatically correct errors.
B.
They require a reference input.
C.
They are always faster than open-loop systems.
D.
They can be more complex than open-loop systems.
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Solution
Closed-loop systems are not necessarily faster than open-loop systems; their speed depends on the design and parameters of the system.
Correct Answer:
C
— They are always faster than open-loop systems.
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Q. Which of the following is true about a second-order system with a damping ratio less than 1?
A.
It is critically damped.
B.
It is underdamped and exhibits oscillatory behavior.
C.
It is overdamped and returns to equilibrium slowly.
D.
It is stable and does not oscillate.
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Solution
A second-order system with a damping ratio less than 1 is underdamped, leading to oscillations in its response.
Correct Answer:
B
— It is underdamped and exhibits oscillatory behavior.
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Q. Which of the following represents a closed-loop system?
A.
Open-loop control
B.
Feedback control
C.
Feedforward control
D.
Open-loop feedback
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Solution
A closed-loop system uses feedback to compare the actual output with the desired output.
Correct Answer:
B
— Feedback control
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Q. Which of the following represents a transfer function?
A.
G(s) = Y(s)/U(s)
B.
G(s) = U(s)/Y(s)
C.
G(s) = Y(s) + U(s)
D.
G(s) = U(s) - Y(s)
Show solution
Solution
The transfer function is defined as the ratio of the Laplace transform of the output to the Laplace transform of the input, G(s) = Y(s)/U(s).
Correct Answer:
A
— G(s) = Y(s)/U(s)
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Q. Which type of system is typically more robust to disturbances?
A.
Open-loop systems
B.
Closed-loop systems
C.
Both are equally robust
D.
Neither is robust
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Solution
Closed-loop systems are generally more robust to disturbances because they use feedback to adjust and maintain the desired output.
Correct Answer:
B
— Closed-loop systems
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