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Test: Introduction to Control Systems - 1 - Electrical Engineering (EE) MCQ


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10 Questions MCQ Test Control Systems - Test: Introduction to Control Systems - 1

Test: Introduction to Control Systems - 1 for Electrical Engineering (EE) 2025 is part of Control Systems preparation. The Test: Introduction to Control Systems - 1 questions and answers have been prepared according to the Electrical Engineering (EE) exam syllabus.The Test: Introduction to Control Systems - 1 MCQs are made for Electrical Engineering (EE) 2025 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Introduction to Control Systems - 1 below.
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Test: Introduction to Control Systems - 1 - Question 1

As compared to an open loop system, a closed loop system is:

Detailed Solution for Test: Introduction to Control Systems - 1 - Question 1

A closed loop system is:

  • More accurate: It uses feedback to correct errors, improving the precision of the system's output.
  • More stable: Feedback helps maintain desired performance despite disturbances or changes in system parameters.
  • Comparison to open loop: Open loop systems lack feedback, making them less capable of correcting deviations and maintaining stability

Thus, option A is correct: A closed loop system is more accurate and more stable than an open loop system.

 

Test: Introduction to Control Systems - 1 - Question 2

Linear system obeys:

Detailed Solution for Test: Introduction to Control Systems - 1 - Question 2

Linear system obeys both reciprocity theorem and principle of maximum power transfer.

Test: Introduction to Control Systems - 1 - Question 3

The most commonly used input signal(s) in a control system is/are:

Detailed Solution for Test: Introduction to Control Systems - 1 - Question 3

A step function is commonly used as a input signal in a control system because:

  • If we go through first order system, here we calculate steady-state error by providing input function then we got zero steady-state error.
  • Actually in step function, output follows input always that means steady error is minimum.

Step Function:

Step Function

Test: Introduction to Control Systems - 1 - Question 4

The Laplace transform of a 4 second transportation lag element is

Detailed Solution for Test: Introduction to Control Systems - 1 - Question 4

Correct answer is D. e−4s

Test: Introduction to Control Systems - 1 - Question 5

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.

Detailed Solution for Test: Introduction to Control Systems - 1 - Question 5
  • In closed loop system there is the presence of a feedback path and this feedback path has connected from output of the system to the input of the system.
  • The whole operation is controlled by the output of the system.
Test: Introduction to Control Systems - 1 - Question 6

As compared to a closed loop system, an open loop system is:

Detailed Solution for Test: Introduction to Control Systems - 1 - Question 6
  • 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.
Test: Introduction to Control Systems - 1 - Question 7

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.

Detailed Solution for Test: Introduction to Control Systems - 1 - Question 7
  • 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.
Test: Introduction to Control Systems - 1 - Question 8

Which of the following is an advantage of a closed-loop control system over an open-loop control system?

Detailed Solution for Test: Introduction to Control Systems - 1 - Question 8
  • A closed-loop system automatically corrects errors and disturbances by using feedback. so C is correct 
  • It continuously compares the output with the desired value and adjusts accordingly.
  • Open-loop systems do not correct errors since they lack feedback.
  • While closed-loop systems reduce steady-state error, they may not always eliminate it completely (hence D is incorrect).
  • They are more complex and costly than open-loop systems, making A incorrect.
  • Closed-loop systems require feedback, so B is incorrect.
Test: Introduction to Control Systems - 1 - Question 9

A ramp function occurs at t = a. It's Laplace transform is:

Detailed Solution for Test: Introduction to Control Systems - 1 - Question 9

Ramp function occurring at t = 0 is denoted by r(t) = tu(t).
Ramp function occurring at t - a will be denoted: 

Test: Introduction to Control Systems - 1 - Question 10

In open loop control systems, the control action is independent of the desired________.

Detailed Solution for Test: Introduction to Control Systems - 1 - Question 10

- In open loop control systems, the control action is independent of the desired output signal.
- The system operates without feedback, meaning it doesn't compare the output with the desired value.
- Control actions are predefined and do not adjust based on output changes.
- This can lead to inaccuracies if the system or external conditions change.
- Open loop systems are typically simpler but less accurate compared to closed loop systems, where feedback adjusts the control action.

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