Control Systems

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Q. What is the Routh-Hurwitz criterion used for?
  • A. To determine the frequency response of a system.
  • B. To analyze the stability of a linear time-invariant system.
  • C. To design PID controllers.
  • D. To plot Bode diagrams.
Q. What is the significance of the gain margin in control systems?
  • A. It indicates the speed of the system.
  • B. It measures how much gain can be increased before instability occurs.
  • C. It determines the steady-state error.
  • D. It shows the phase shift of the system.
Q. What is the significance of the gain margin in stability analysis?
  • A. It indicates the speed of the system.
  • B. It measures how much gain can be increased before the system becomes unstable.
  • C. It shows the phase shift of the system.
  • D. It determines the steady-state error.
Q. What is the significance of the Nyquist criterion in stability analysis?
  • A. It determines the time response of the system.
  • B. It provides a graphical method to assess stability based on the open-loop frequency response.
  • C. It calculates the steady-state error.
  • D. It is used to design PID controllers.
Q. What is the significance of the Nyquist plot in control systems?
  • A. It shows the time response of a system.
  • B. It helps in determining the stability of a system in the frequency domain.
  • C. It is used for root locus analysis.
  • D. It provides the transfer function of a system.
Q. What is the significance of the phase margin in control systems?
  • A. It indicates the speed of the system.
  • B. It measures the stability of the system.
  • C. It determines the system's bandwidth.
  • D. It indicates the type of controller used.
Q. What is the significance of the time constant in a first-order system?
  • A. It determines the system's stability.
  • B. It indicates how quickly the system responds to changes.
  • C. It is irrelevant to system performance.
  • D. It defines the system's frequency response.
Q. What is the stability condition for a system with the characteristic equation s^2 + 3s + 2 = 0?
  • A. Stable
  • B. Unstable
  • C. Marginally stable
  • D. Cannot be determined
Q. What is the stability condition for a system with the transfer function G(s) = 1/(s^2 + 4s + 5)?
  • A. All poles in the left half-plane
  • B. At least one pole in the right half-plane
  • C. Poles on the imaginary axis
  • D. All poles in the right half-plane
Q. What is the steady-state error for a type 1 system with a step input?
  • A. Zero
  • B. Finite
  • C. Infinite
  • D. Depends on gain
Q. What is the steady-state error for a unit step input in a type 1 system?
  • A. Zero
  • B. Infinity
  • C. Constant
  • D. Proportional to input
Q. What is the steady-state response of a first-order system to a step input?
  • A. Exponential decay
  • B. Linear growth
  • C. Constant value
  • D. Oscillatory response
Q. What is the time constant of a second-order system with a damping ratio of 0.5 and natural frequency of 2 rad/s?
  • A. 0.5
  • B. 1
  • C. 2
  • D. 4
Q. What is the time constant of a system with a transfer function G(s) = 1/(2s + 1)?
  • A. 0.5
  • B. 1
  • C. 2
  • D. 4
Q. What is the time constant of a system with a transfer function G(s) = 5/(2s + 5)?
  • A. 0.4
  • B. 2
  • C. 5
  • D. 10
Q. What is the time constant of a system with a transfer function of 1/(2s + 1)?
  • A. 0.5 seconds
  • B. 2 seconds
  • C. 1 second
  • D. 4 seconds
Q. What is the transfer function of a first-order system with a time constant of 2 seconds?
  • A. 1/(2s + 1)
  • B. 2/(s + 2)
  • C. 1/(s + 2)
  • D. 2/(2s + 1)
Q. What is the transfer function of a first-order system with a time constant of 5 seconds?
  • A. 1/(5s + 1)
  • B. 5/(s + 5)
  • C. 1/(s + 5)
  • D. 5/(5s + 1)
Q. What is the transfer function of a first-order system?
  • A. 1/(s + 1)
  • B. s/(s + 1)
  • C. 1/(s^2 + 1)
  • D. s^2/(s + 1)
Q. What is the transfer function of a system?
  • A. A mathematical representation of the system's output to input ratio.
  • B. A graphical representation of system stability.
  • C. A method to calculate PID parameters.
  • D. A type of feedback loop.
Q. Which component of a PID controller is responsible for eliminating steady-state error?
  • A. Proportional
  • B. Integral
  • C. Derivative
  • D. All of the above
Q. Which controller is best suited for eliminating steady-state error in a system?
  • A. Proportional controller
  • B. Integral controller
  • C. Derivative controller
  • D. PID controller
Q. Which controller is commonly used to improve the stability of a system?
  • A. Proportional controller.
  • B. Integral controller.
  • C. Derivative controller.
  • D. PID controller.
Q. Which controller is known for its ability to eliminate steady-state error?
  • A. Proportional controller
  • B. Integral controller
  • C. Derivative controller
  • D. PID controller
Q. Which controller is typically used to eliminate steady-state error in a system?
  • A. Proportional controller
  • B. Integral controller
  • C. Derivative controller
  • D. PID controller
Q. Which controller is used to eliminate steady-state error in a system?
  • A. Proportional controller
  • B. Integral controller
  • C. Derivative controller
  • D. PID controller
Q. Which of the following describes a closed-loop control system?
  • A. Output is independent of input.
  • B. Feedback is used to compare output with input.
  • C. No feedback is used.
  • D. Only feedforward control is applied.
Q. Which of the following indicates a stable system in a Bode plot?
  • A. The gain margin is positive.
  • B. The phase margin is negative.
  • C. The gain increases without bound.
  • D. The phase crosses -180 degrees.
Q. Which of the following indicates a stable system in the context of Bode plots?
  • A. The gain margin is negative.
  • B. The phase margin is positive.
  • C. The gain increases indefinitely.
  • D. The phase crosses -180 degrees at a low frequency.
Q. Which of the following indicates a stable system in the root locus plot?
  • A. All poles are in the right half-plane.
  • B. All poles are in the left half-plane.
  • C. Poles are on the imaginary axis.
  • D. Poles are outside the unit circle.
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