Linear Control Systems — MCQs – EE

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1. : What is the main purpose of a control system?



2. : A system in which output has no effect on the input signal is called:



3. : The open-loop transfer function of a system is given by:



4. : Which of the following is a closed-loop control system?



5. : Feedback in control systems is used to:



6. : The transfer function of a system gives the relationship between:



7. : The steady-state error of a Type-0 system for a step input is:



8. : The addition of poles to a transfer function generally:



9. : Which plot shows how the roots of the characteristic equation vary with system gain?



10. : For stability, the real parts of all closed-loop poles must be:



11. : The time constant of a first-order system is the time taken for the response to reach:



12. : The damping ratio (ζ) determines:



13. : The steady-state error for a ramp input in a Type-1 system is:



14. : A root locus branch always starts at:



15. : The Nyquist stability criterion is used to determine:



16. : The Bode plot is a graph between:



17. : If all poles of the transfer function lie in the left half of the s-plane, the system is:



18. : Which component introduces a phase lead in a system?



19. : The root locus branches terminate at:



20. : A system is said to be marginally stable if:



21. : Which test can be used to determine the stability of a system without calculating roots?



22. : The effect of derivative control is to:



23. : The integral control action reduces:



24. : The order of a system is determined by the:



25. : A second-order system has two poles at -2 and -3. The system is:



26. : The phase margin is the additional phase required to reach:



27. : The gain margin is the factor by which gain can be multiplied before the system becomes:



28. : The damping ratio ζ = 1 indicates:



29. : If ζ = 0, the system response is:



30. : The bandwidth of a control system is a measure of:



31. : A lag compensator is used to:



32. : The phase lag introduced by a lag compensator is usually:



33. : The gain crossover frequency is the frequency where:



34. : The purpose of a PID controller is to:



35. : The steady-state error of a Type-2 system to a ramp input is:



36. : The rise time is defined as the time required for the response to rise from:



37. : Which of the following improves the speed of response?



38. : The steady-state error for a parabolic input in a Type-1 system is:



39. : The transient response of a system depends on:



40. : A system with more number of poles than zeros is:



41. : The final value theorem is used to determine:



42. : The open-loop system becomes oscillatory at the frequency where:



43. : In a Bode plot, each pole contributes:



44. : The unit impulse response of a system is the:



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