Introduction to Control Theory: Master the Fundamentals of Feedback Systems

Question 1

In a feedback control system, which component compares the system's output to a desired reference value?

Accepted Answer

Comparator

Answer

Sensor

Answer

Controller

Answer

Actuator

Question 2

Which characteristic is NOT a feature of a closed-loop control system?

Accepted Answer

System response is unaffected by external disturbances

Answer

Continuous comparison of output to reference input

Answer

Control adjustments based on system output

Answer

Feedback loop enhances system stability

Question 3

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

Accepted Answer

Open-loop control

Answer

Positive feedback

Answer

Negative feedback

Answer

Proportional-integral-derivative (PID) feedback

Question 4

In a closed-loop control system, which of the following occurs?

Accepted Answer

The output is used to adjust the input.

Answer

The system is unaffected by external influences.

Answer

The system's gain is always above 1.

Answer

The system is always stable.

Question 5

Which of the following is NOT a characteristic of a closed-loop control system?

Accepted Answer

Open-loop behavior

Answer

Feedback

Answer

Stability

Answer

Error correction

Question 6

In a block diagram representation of a control system, which component's output serves as the input to the controller?

Accepted Answer

Sensor

Answer

Actuator

Answer

Controller

Answer

Plant

Question 7

Which control strategy is primarily designed to eliminate steady-state error?

Accepted Answer

Integral control

Answer

Proportional control

Answer

Derivative control

Answer

PID control

Question 8

In a stable control system, how does the output response behave in response to a step input?

Accepted Answer

Gradually reaches a steady state

Answer

Continuously oscillates

Answer

Decreases to zero

Answer

Increases indefinitely

Question 9

Which advantage is associated with feedback control systems?

Accepted Answer

Enhanced disturbance rejection

Answer

Increased complexity

Answer

Open-loop response

Answer

Reduced cost

Question 10

A system with a transfer function of G(s) = 1/(s²+2s+1) has how many poles?

Accepted Answer

Two

Answer

One

Answer

Zero

Answer

Three

Question 11

Which of the following is NOT a type of actuator employed in control systems?

Accepted Answer

Resistor

Answer

Motor

Answer

Solenoid

Question 12

In a PI controller, the purpose of the integral term is to:

Accepted Answer

Reduce steady-state error

Answer

Accelerate transient response

Answer

Eliminate overshoot

Answer

Enhance system stability

Question 13

Which characteristic is essential for a well-designed control system?

Accepted Answer

Acceptable transient response

Answer

Infinite gain

Answer

Zero steady-state error

Answer

No overshoot

Question 14

In a control system with a closed-loop transfer function of G(s) = K/(s²+2s+1), what does parameter K represent?

Accepted Answer

Steady-state gain

Answer

Transient response

Answer

Pole locations

Answer

Stability

Question 15

Which of the following is a characteristic of a feedback control system?

Accepted Answer

Corrective action is taken based on the system's output

Answer

Open-loop operation

Answer

Absence of a sensor

Question 16

What is the primary purpose of using a block diagram in control theory?

Accepted Answer

To graphically represent the interactions between components

Answer

To derive the mathematical model of the system

Answer

To simulate the physical layout of the system

Question 17

Which of the following is an advantage of using feedback in a control system?

Accepted Answer

Improved system accuracy

Answer

Simplified system design

Answer

Increased system speed

Answer

Reduced cost of implementation

Question 18

Which of the following is an example of a practical application of control theory?

Accepted Answer

Regulating the speed of a motor

Answer

Designing bridges

Answer

Analyzing financial markets

Answer

Predicting weather patterns

Question 19

What type of control system relies solely on internal mechanisms to adapt to changes without external feedback?

Accepted Answer

Open-loop

Answer

Autonomous

Answer

Closed-loop

Answer

Adaptive

Question 20

Which component of a typical feedback control system is responsible for generating the control signal?

Accepted Answer

Controller

Answer

Sensor

Answer

Plant

Answer

Actuator

Question 21

What is the function of a regulator in a control system?

Accepted Answer

Maintaining a constant output despite input variations

Answer

Converting the control signal to a physical action

Answer

Tracking a desired trajectory

Answer

Comparing the actual output to the reference

Question 22

Which condition is necessary for a control system to effectively reject disturbances?

Accepted Answer

Negative feedback

Answer

Open-loop operation

Answer

Positive feedback

Answer

Adaptive control

Question 23

A system where the output is not fed back to influence the input is known as a(n):

Accepted Answer

Open-loop system

Answer

Feedback system

Answer

Adaptive system

Answer

Closed-loop system

Question 24

Which of the following is NOT a characteristic of a closed-loop control system?

Accepted Answer

Less sensitive to disturbances

Answer

Increased complexity

Answer

Improved accuracy

Answer

Ability to adapt to changing conditions

Question 25

The process of using the output of a system to adjust the input is called:

Accepted Answer

Feedback

Answer

Feedforward

Answer

Control

Answer

Optimization

Question 26

A block diagram is a graphical representation of a control system that shows:

Accepted Answer

The components and their relationships

Answer

The mathematical equations governing the system

Answer

The physical layout of the system

Answer

The historical development of the system

Question 27

In a block diagram, a summing junction represents:

Accepted Answer

The addition or subtraction of signals

Answer

The delay of signals

Answer

The amplification of signals

Answer

The filtering of signals

Question 28

Which of the following is an example of a real-world application of control theory?

Accepted Answer

Cruise control in a car

Answer

Calculating the area of a triangle

Answer

Solving a quadratic equation

Answer

Predicting the weather

Question 29

The difference between the desired output and the actual output of a control system is called:

Accepted Answer

Error signal

Answer

Control variable

Answer

Feedback signal

Answer

Setpoint

Question 30

A control system designed to maintain a constant temperature in a room is an example of:

Accepted Answer

Regulation

Answer

Tracking

Answer

Optimization

Answer

Compensation

Question 31

A control system that uses a predetermined input signal to achieve a desired output is classified as:

Accepted Answer

Open-loop

Answer

Closed-loop

Answer

Feedback

Answer

Adaptive

Question 32

Which of the following is NOT a key component of a typical closed-loop control system?

Accepted Answer

Actuator

Answer

Sensor

Answer

Controller

Answer

Reference input

Question 33

A system where the output is not fed back to the input is known as:

Accepted Answer

Open-loop system

Answer

Feedback system

Answer

Control system

Answer

Closed-loop system

Question 34

Which of the following is NOT a component of a typical feedback control system?

Accepted Answer

External disturbance

Answer

Process

Answer

Sensor

Answer

Controller

Question 35

A block diagram is used to:

Accepted Answer

Visually represent the relationships between different components of a control system.

Answer

Calculate the exact output of a system.

Answer

Simulate the dynamic behavior of a system.

Question 36

A control system aims to:

Accepted Answer

Maintain a desired output despite disturbances.

Answer

Eliminate all errors in the system.

Answer

Increase the speed of system response.

Answer

Minimize the cost of system operation.

Question 37

Which of the following is an example of a closed-loop control system?

Accepted Answer

Cruise control in a car

Answer

A traffic light system

Answer

A washing machine with a timer

Answer

A simple thermostat in a house

Question 38

The difference between the desired output and the actual output is known as:

Accepted Answer

Error

Answer

Setpoint

Answer

Disturbance

Answer

Feedback

Question 39

In a feedback control system, the controller adjusts the input based on:

Accepted Answer

The measured output

Answer

The disturbance

Answer

The desired output

Answer

The control signal

Question 40

A control system is considered stable if:

Accepted Answer

The output remains bounded despite disturbances.

Answer

The output reaches the desired setpoint quickly.

Answer

The system is immune to external noise.

Answer

The system operates with minimal energy consumption.

Question 41

In a block diagram, a summing junction represents:

Accepted Answer

Addition or subtraction of signals

Answer

Multiplication of signals

Answer

Differentiation of signals

Answer

Integration of signals

Question 42

Which of the following is NOT a characteristic of a closed-loop control system?

Accepted Answer

Insensitivity to disturbances

Answer

Use of feedback to adjust the system

Answer

Improved accuracy and stability

Answer

Ability to maintain a desired output

Question 43

A system where the output is not fed back to the input is known as:

Accepted Answer

Open-loop system

Answer

Control system

Answer

Feedback system

Answer

Closed-loop system

Question 44

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

Accepted Answer

To compare the desired output with the actual output and generate a corrective signal

Answer

To measure the system's output

Answer

To provide the system with power

Question 45

In a block diagram, which of the following symbols represents a summation point?

Accepted Answer

Circle with a plus sign inside

Answer

Rectangle

Answer

Diamond

Answer

Triangle

Question 46

Which of the following is NOT a common application of control theory?

Accepted Answer

Predicting weather patterns

Answer

Controlling the temperature in a building

Answer

Stabilizing an aircraft in flight

Answer

Regulating the speed of a motor

Question 47

A system's ability to maintain a desired output despite disturbances is called:

Accepted Answer

Robustness

Answer

Stability

Answer

Accuracy

Answer

Responsiveness

Question 48

What does the gain of a system represent in control theory?

Accepted Answer

The ratio of output change to input change

Answer

The maximum output value

Answer

The time it takes for the system to reach a steady state

Answer

The rate of change of the output

Question 49

Which type of control system is generally more sensitive to noise and disturbances?

Accepted Answer

Open-loop system

Answer

Closed-loop system

Answer

Both are equally sensitive

Question 50

What is the purpose of a feedback loop in a control system?

Accepted Answer

To monitor the system's output and adjust the input to maintain the desired output

Answer

To provide power to the system

Answer

To measure the system's input

Question 51

A system with a negative feedback loop typically exhibits:

Accepted Answer

Improved stability and reduced error

Answer

Increased sensitivity to disturbances

Answer

Faster response time

Answer

Higher output values