Feedback Control Quizzes: Test Your Understanding of Control Systems

Question 1

The primary objective of a feedback control system is to:

Accepted Answer

Maintain a specified output value

Answer

Reduce the error signal to zero

Answer

Enhance the system's speed

Answer

Minimize external disturbances

Question 2

The key distinction between closed-loop and open-loop control systems lies in the:

Accepted Answer

Use of feedback in closed-loop systems, absent in open-loop systems

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Stability of closed-loop systems, which is superior to open-loop systems

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Speed of open-loop systems, which is faster than closed-loop systems

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Complexity of open-loop systems, which is greater than closed-loop systems

Question 3

The operation of a proportional controller involves:

Accepted Answer

Reducing the error signal by a constant factor

Answer

Eliminating the error signal gradually

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Predicting future errors and adjusting the control signal accordingly

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Amplifying the error signal

Question 4

A key advantage of using feedback control in an engineering system is:

Accepted Answer

Enhanced accuracy in achieving the desired output

Answer

Reduced impact of noise on system performance

Answer

Faster response time to changes in the system

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Lower production costs

Question 5

In the context of feedback control systems, the Laplace transform of the function f(t) = e^(-at) is:

Accepted Answer

1 / (s + a)

Answer

s / (s + a)

Answer

a / (s + a)

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1 / (s - a)

Question 6

The primary goal of system identification in feedback control is to:

Accepted Answer

Determine the mathematical model representing the system

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Design the controller for the system

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Simulate the behavior of the system

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Evaluate the performance of the system

Question 7

The Nyquist stability criterion:

Accepted Answer

Provides a graphical method for determining the stability of a feedback control system

Answer

Involves using an algebraic equation to calculate stability

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Employs simulation techniques to analyze stability

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Relies on experimental methods to verify stability

Question 8

Which of the following is NOT a type of feedback control system in engineering?

Accepted Answer

Open-loop control

Answer

Negative feedback

Answer

Positive feedback

Answer

Closed-loop control

Question 9

In a closed-loop feedback control system, the transfer function is calculated as:

Accepted Answer

Closed-loop gain / (1 + Closed-loop gain)

Answer

(1 + Closed-loop gain) / Closed-loop gain

Answer

Closed-loop gain - 1

Answer

1 - Closed-loop gain

Question 10

The stability of a feedback control system is primarily determined by:

Accepted Answer

The location of the poles of the transfer function

Answer

The gain of the system

Answer

The type of feedback used

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The input signal

Question 11

The steady-state error in a feedback control system represents:

Accepted Answer

The difference between the desired output and the actual output

Answer

The difference between the input and output

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The difference between the error and the control signal

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The difference between the system gain and the feedback gain

Question 12

In a negative feedback control system, the feedback signal is:

Accepted Answer

Subtracted from the input signal

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Added to the input signal

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Multiplied by the input signal

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Divided by the input signal

Question 13

What is the core principle of feedback control and why is it crucial in engineering systems?

Accepted Answer

Feedback control involves continuously comparing the system's output to a desired value, using the difference (error) to adjust the input and maintain the desired output.

Answer

Feedback control is only used in digital systems.

Answer

Feedback control systems always guarantee stability.

Answer

Feedback control is only applicable to complex systems.

Question 14

The primary goal of a feedback control system is to:

Accepted Answer

Maintain the desired output, mitigating disturbances

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Amplify incoming signals

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Reduce system noise

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Generate random signals

Question 15

A limitation of proportional control is:

Accepted Answer

Possibility of steady-state error

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Exclusively applicable to systems with unchanging parameters

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Unsuitability for systems with significant time delays

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Requirement for a high-gain amplifier

Question 16

In a feedback control system, a sensor's role is to:

Accepted Answer

Measure the system's output

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Compare the output to the reference input

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Amplify the error signal

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Generate the control signal

Question 17

Identify the option that does NOT represent a type of feedback control system:

Accepted Answer

Open-Loop Control

Answer

Positive Feedback Control

Answer

Negative Feedback Control

Answer

Closed-Loop Control

Question 18

Which characteristic is attributed to negative feedback control?

Accepted Answer

Tendency to reduce error over time

Answer

Tendency to amplify error over time

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Tendency to cause system instability

Question 19

Define the gain of a feedback control system:

Accepted Answer

Ratio of output change to error change

Answer

Difference between desired output and actual output

Answer

Sum of input and output

Answer

Ratio of error change to output change

Question 20

Which of the following factors is crucial for maintaining the stability of a feedback control system?

Accepted Answer

Loop Gain

Answer

Environmental conditions

Answer

Type of feedback

Answer

Input signal characteristics

Question 21

What is the primary function of a PID controller in a feedback control system?

Accepted Answer

Adjusts proportional, integral, and derivative gains

Answer

Modifies set point and error

Answer

Modifies input and output signals

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Adjusts gain and stability

Question 22

Identify the key advantage of utilizing feedback control in engineering systems:

Accepted Answer

Enhanced accuracy and stability

Answer

Reduced cost

Answer

Improved aesthetics

Answer

Increased complexity

Question 23

Describe the behavior of an underdamped feedback control system:

Accepted Answer

Exhibits oscillations before reaching the desired output

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Overshoots the desired output before settling

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Becomes unstable and diverges from the desired output

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Reaches the desired output without oscillations

Question 24

What is the significance of a transfer function in feedback control?

Accepted Answer

Describes the mathematical relationship between input and output

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Defines the error signal

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Determines system stability

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Calculates controller gain

Question 25

In a feedback control system designed to maintain room temperature, identify the controlled variable:

Accepted Answer

Room temperature

Answer

Error signal between desired and actual temperatures

Answer

Input signal to the controller

Answer

Output signal from the controller