Control System Analysis: Master the Fundamentals for Electrical Engineering

Question 1

Which component is NOT found in a standard feedback control system?

Accepted Answer

Filter

Answer

Input

Answer

Output

Answer

Controller

Question 2

A control system with a high damping ratio exhibits:

Accepted Answer

Slow response and low overshoot

Answer

Fast response and high overshoot

Answer

Oscillatory response

Answer

Unstable response

Question 3

Which type of controller combines proportional, integral, and derivative actions?

Accepted Answer

PID

Answer

P-only

Answer

PI

Answer

PD

Question 4

A phase compensator in a control system is used to:

Accepted Answer

Increase phase margin

Answer

Decrease gain margin

Answer

Improve transient response

Answer

Reduce steady-state error

Question 5

A type 1 control system is defined by its:

Accepted Answer

Zero steady-state error to a unit step input

Answer

Zero steady-state error to a unit ramp input

Answer

Zero steady-state error to a unit parabolic input

Answer

Non-zero steady-state error for all inputs

Question 6

Which characteristic is NOT associated with a stable control system?

Accepted Answer

Excessive gain

Answer

Bounded output with bounded input

Answer

No sustained oscillations

Answer

Presence of negative feedback

Question 7

Which transfer function represents an integrator?

Accepted Answer

1/s

Answer

s

Answer

1

Answer

s^2

Question 8

What is the primary purpose of using the root locus technique?

Accepted Answer

Determining the stability of a control system

Answer

Designing controllers for improved system performance

Answer

Analyzing the frequency response of a system

Answer

Calculating the gain margin of a system

Question 9

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

Accepted Answer

All the options are types of feedback control systems.

Answer

Positive feedback

Answer

Negative feedback

Answer

Proportional feedback

Question 10

Identify the main advantage of using a proportional-integral-derivative (PID) controller:

Accepted Answer

All the options are advantages of using a PID controller.

Answer

Improved transient response

Answer

Reduced steady-state error

Answer

Increased stability

Question 11

What is the Bode plot primarily used to represent?

Accepted Answer

Frequency response of a control system

Answer

Root locus of a control system

Answer

Nyquist plot of a control system

Answer

Time response of a control system

Question 12

Which of the following is a type of disturbance in a control system?

Accepted Answer

All the options are types of disturbances in control systems.

Answer

Step disturbance

Answer

Ramp disturbance

Answer

Parabolic disturbance

Question 13

What is the definition of the open-loop transfer function of a control system?

Accepted Answer

Transfer function from the input to the output without considering feedback

Answer

Transfer function from the output to the input without considering feedback

Answer

Transfer function from the input to the output with feedback

Answer

Transfer function from the output to the input with feedback

Question 14

What is the primary purpose of a root locus plot in control system analysis?

Accepted Answer

To determine the stability of a system

Answer

To calculate the system's gain margin

Answer

To optimize the system's phase margin

Answer

To generate the system's Nyquist plot

Question 15

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

Accepted Answer

All poles in the left-half of the s-plane

Answer

Positive loop gain

Answer

Unstable open-loop poles

Answer

Infinite steady-state error

Question 16

What is the main benefit of adding damping to a control system?

Accepted Answer

Improved stability

Answer

Increased bandwidth

Answer

Reduced steady-state error

Answer

Faster rise time

Question 17

Which of the following is NOT a type of PID controller?

Accepted Answer

Integral-derivative (ID)

Answer

Proportional-integral-derivative (PID)

Answer

Proportional-only (P)

Answer

Proportional-integral (PI)

Question 18

What is the primary function of a frequency response analyzer in control system testing?

Accepted Answer

Measuring the system's response to a sinusoidal input

Answer

Determining the system's open-loop poles

Answer

Designing the system's feedback loop

Answer

Simulating the system's closed-loop behavior

Question 19

The frequency at which the magnitude of the frequency response is 3 dB below the maximum value is known as the:

Accepted Answer

Corner frequency

Answer

Cutoff frequency

Answer

Natural frequency

Answer

Resonance frequency

Question 20

A key characteristic of a good feedback control system is:

Accepted Answer

Low sensitivity

Answer

High sensitivity

Answer

High bandwidth

Answer

Low gain

Question 21

The transfer function of a system with a gain of 5 and a time constant of 0.2 is:

Accepted Answer

5 / (s + 5)

Answer

1 / (s + 5)

Answer

5 / s

Answer

1 / s

Question 22

Identify the characteristic that is NOT associated with a stable control system:

Accepted Answer

Negative damping

Answer

Positive phase margin

Answer

Stable equilibrium point

Answer

Positive gain margin

Question 23

What is the primary objective of using a root locus plot?

Accepted Answer

Determining the stability of a control system

Answer

Analyzing the frequency response of a system

Answer

Designing a compensator for a control system

Answer

Plotting the poles and zeros of a transfer function

Question 24

Which compensator type is employed to enhance the stability of a control system?

Accepted Answer

Lead compensator

Answer

Lag compensator

Answer

PI compensator

Answer

PID compensator

Question 25

Identify the time-domain analysis technique:

Accepted Answer

State-space analysis

Answer

Root locus

Answer

Bode plot

Answer

Nyquist plot

Question 26

What is the appropriate unit of measurement for gain in a control system?

Accepted Answer

dB

Answer

rad/s

Answer

Hz

Answer

seconds

Question 27

Which option represents a non-linear control system?

Accepted Answer

Fuzzy logic controller

Answer

PID controller

Answer

Proportional controller

Answer

Integral controller

Question 28

Which technique is used exclusively for analyzing control systems in the time domain?

Accepted Answer

Step Response

Answer

Root Locus

Answer

Bode Plot

Answer

Nyquist Plot

Question 29

Which of the following is NOT a common type of control system design technique?

Accepted Answer

Deterministic

Answer

Classical

Answer

Modern

Answer

Adaptive

Question 30

What is the significance of the Nyquist stability criterion in control system analysis?

Accepted Answer

It provides a graphical method to determine the stability of a closed-loop control system based on its frequency response.

Answer

It calculates the gain and phase margin of a system.

Answer

It predicts the transient response of a system.

Question 31

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

Accepted Answer

To control a process variable based on proportional, integral, and derivative feedback.

Answer

To amplify the error signal in a control system.

Answer

To provide a reference input for a control system.

Question 32

Which of the following is a desirable characteristic of a well-designed control system?

Accepted Answer

Stability, accuracy, and fast response time.

Answer

High gain and low bandwidth.

Answer

Large overshoot and settling time.

Answer

Excessive noise and distortion.

Question 33

What is the fundamental difference between a closed-loop and an open-loop control system?

Accepted Answer

In a closed-loop system, the output is measured and fed back to the controller, while in an open-loop system, it is not.

Answer

Open-loop systems are always more stable than closed-loop systems.

Answer

Closed-loop systems are always more accurate than open-loop systems.

Question 34

What is the primary application of the Laplace transform in control system analysis?

Accepted Answer

To convert time-domain equations into frequency-domain equations, enabling the analysis of system behavior in the frequency domain.

Answer

To solve differential equations governing control systems.

Answer

To determine the stability of control systems.

Question 35

Which of the following is a key benefit of using simulation software in control system design?

Accepted Answer

It allows engineers to test and evaluate control systems virtually without the need for physical prototypes.

Answer

Simulation software can only be used for simple control systems.

Answer

Simulation software is always more accurate than real-world testing.

Question 36

What is the main purpose of a Bode plot in control system analysis?

Accepted Answer

To graphically represent the frequency response of a control system in terms of gain and phase shift over a range of frequencies.

Answer

To determine the stability of a control system.

Answer

To design controllers for control systems.

Question 37

Which of the following types of control systems is characterized by its continuous operation in the time domain?

Accepted Answer

Continuous-time

Answer

Discrete-time

Answer

Stochastic

Answer

Nonlinear

Question 38

Which of the following equations represents the closed-loop transfer function of a control system with open-loop transfer function G(s) and feedback transfer function H(s)?

Accepted Answer

T(s) = G(s) / (1 + G(s)H(s))

Answer

T(s) = H(s) / (1 + G(s)H(s))

Answer

T(s) = G(s) + H(s)

Answer

T(s) = G(s) - H(s)

Question 39

What is the primary purpose of the Nyquist stability criterion?

Accepted Answer

To determine the stability of a control system using its frequency response

Answer

To determine the bandwidth of a control system

Answer

To determine the phase margin of a control system

Question 40

Which of the following is a type of root locus plot?

Accepted Answer

Asymptotic plot

Answer

Nyquist plot

Answer

Bode plot

Answer

Polar plot

Question 41

What does a negative phase margin in a control system indicate?

Accepted Answer

The system is unstable

Answer

The system has a low gain margin

Answer

The system has a high gain margin

Answer

The system is stable

Question 42

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

Accepted Answer

To adjust the control input based on the system error

Answer

To provide feedback to the system

Answer

To amplify the system output

Question 43

Which of the following is a type of control system architecture?

Accepted Answer

Cascade control

Answer

Nyquist plot

Answer

Bode plot

Answer

Root locus plot

Question 44

What is the typical shape of the step response of a first-order control system?

Accepted Answer

Exponential decay

Answer

Sinusoidal oscillation

Answer

Step function