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Stability MCQs

Practice Stability MCQs with four options, answers and explanations for focused Electronics & Telecommunication Engineering revision.

Question 1
Control SystemsStability

For a stable continuous-time linear system, poles of the closed-loop transfer function should generally lie in which region of the s-plane?

  • ARight half-plane
  • BLeft half-plane
  • COnly on the imaginary axis
  • DAt the origin only
Report an error
Correct Answer: B. Left half-plane
Explanation: For an asymptotically stable continuous-time LTI closed-loop system, its poles lie in the left half of the s-plane.
Reference: Classical control-system stability criterion
Question 2
Signals & SystemsStability

A causal rational continuous-time system has poles at -2 and +1. It is BIBO stable?

  • AYes, because one pole is negative
  • BNo, because a pole lies in the right half-plane
  • CYes, because it is causal
  • DAlways stable if rational
Report an error
Correct Answer: B. No, because a pole lies in the right half-plane
Explanation: For a causal rational CT system, all poles must lie strictly in the left half-plane for BIBO stability.
Reference: Standard signals and systems: stability
Question 4
Signals & SystemsStability

A causal discrete-time system has a pole at z=1.2. Its BIBO stability is?

  • AStable
  • BUnstable
  • CMarginally stable in every sense
  • DIndependent of pole location
Report an error
Correct Answer: B. Unstable
Explanation: For a causal rational DT system, a pole outside the unit circle prevents the unit circle from being in the ROC, so it is not BIBO stable.
Reference: Standard signals and systems: stability