About Control System

Following are some of the multiple choice questions on the Control System with answers that will help the students in developing their knowledge.

Control System MCQ

1. Zero initial condition for a system means

  • input reference signal is zero
  • zero stored energy
  • ne initial movement of moving parts
  • system is at rest and no energy is stored in any of its components

2. Which notation represents the feedback path in closed loop system representation

  • e(t)
  • c(t)
  • r(t)
  • s(t)
  • b(t)

3. The initial response when tne output is not equal to input is called

  • Transient response
  • Error response
  • Dynamic response
  • Either of the above

4. Mass, in force-voltage analogy, is analogous to

  • charge
  • current
  • inductance
  • resistance

5. An increase in gain, in most systems, leads to

  • smaller damping ratio
  • larger damping ratio
  • constant damping ratio
  • none of the above

6. Insertion of negative feedback in control system affects:

  • the transient response to vanish uniformly
  • the transient response to decay very fast
  • no change in transient response
  • the transient response decays at slow rate

7. Which of the following will not decrease as a result of introduction of negative feedback?

  • instability
  • bandwidth
  • overall gain
  • distortion

8. Which of the following are the not characteristics of the closed loop systems?

  • it does not compensate for disturbance
  • it reduces the sensitivity of plant-parameter variations
  • it does not involve output measurements
  • it does not has the ability to control the system transient response

9. Conventional control theory is applicable to              systems

  • siso
  • mimo
  • time varying
  • non-linear

10. State space analysis is applicable even if the initial conditions are            

  • zero
  • non-zero
  • equal
  • not equal

11. Which among the following are the interconnected units of state diagram representation?

  • scalars
  • adders
  • integrator
  • all of the mentioned

12. Which among the following plays a crucial role in determining the state of dynamic system?

  • state variables
  • state vector
  • state space
  • state scalar

13. Which among the following constitute the state model of a system in addition to state equations?

  • input equations
  • output equations
  • state trajectory
  • state vector

14. State model representation is possible using                    

  • physical variables
  • phase variables
  • canonical state variables
  • all of the mentioned

15. Which mechanism in control engineering implies an ability to measure the state by taking measurements at output?

  • controllability
  • observability
  • differentiability
  • adaptability

16. According to the property of state transition method, e0 is equal to            

  • i
  • a
  • e-at
  • -eat

17. Stability of a system implies that :

  • small changes in the system input does not result in large change in system output
  • small changes in the system parameters does not result in large change in system output
  • small changes in the initial conditions does not result in large change in system output
  • all of the above mentioned

18. Real distinct and negative.

  • center
  • focus point
  • saddle point
  • stable node

19. Real and equal but with opposite sign.

  • center
  • focus point
  • saddle point
  • stable node

20. Pure imaginary pair:

  • centre
  • focus point
  • saddle point
  • stable node

21. Servomotor:

  • armature controlled fhp dc motor
  • a pair of synchronous transmitter and control transformer
  • tach generator
  • amplidyne

22. The addition of open loop zero pulls the root loci towards:

  • the left and therefore system becomes more stable
  • the right and therefore system becomes unstable
  • imaginary axis and therefore system becomes marginally stable
  • the left and therefore system becomes unstable

23. If root loci plots of a particular control system do not intersect the imaginary axis at any point, then the gain margin of the system will be:

  • 0
  • 0.707
  • 1
  • infinite

24. When the number of poles is equal to the number of zeroes, how many branches of root locus tends towards infinity?

  • 1
  • 2
  • equal to number of zeroes

25. When the number of poles is equal to the number of zeroes, how many branches of root locus tends towards infinity?

  • 1
  • 2
  • equal to number of zeroes

26. System transformation on function H(z) for a discrete time LTI system expressed in state variable form with zero initial condition

  • -1b+d
  • c(zi-a)-1
  • (zi-a)-1z
  • (zi-a)-1

27. System transformation on function H(z) for a discrete time LTI system expressed in state variable form with zero initial condition

  • -1b+d
  • c(zi-a)-1
  • (zi-a)-1z
  • (zi-a)-1

28. State space analysis is applicable for non- linear systems and for multiple input and output systems.

  • true
  • false

29. State space analysis is applicable for non- linear systems and for multiple input and output systems.

  • true
  • false

30. When human being tries to approach an object, his brain acts as,

  • an error measuring device
  • a controller
  • an actuator
  • an amplifier

31. For two-phase AC servomotor, if the rotor’s resistance and reactance are respectively R and X, its length and diameter are respectively L and D then,

  • x/r and l/d are both small
  • x/r is large but l/d is small
  • x/r is small but l/d is large
  • x/r and l/d are both large

32. Complex conjugate pair:

  • center
  • focus point
  • saddle point
  • stable node

33. A transfer function of the system does not have pole-zero cancellation? Which of the following statements is true?

  • system is neither controllable nor observable
  • system is completely controllable and observable
  • system is observable but uncontrollable
  • system is controllable and unobservable

34. Consider a system if represented by state space equation and x1 (t) =x2 (t), then the system is:

  • controllable
  • uncontrollable
  • observable
  • unstable

35. Kalman’s test is for :

  • observability
  • controllability
  • optimality
  • observability and controllability

36. Kalman’s test is for :

  • observability
  • controllability
  • optimality
  • observability and controllability

37. A system is said to be                           if it is possible to transfer the system state from any initial state to any desired state in finite interval of time.

  • controllable
  • observable
  • cannot be determined
  • controllable and observable

38. A system is said to be                           if it is possible to transfer the system state from any initial state to any desired state in finite interval of time.

  • controllable
  • observable
  • cannot be determined
  • controllable and observable

39. With feedback            reduces.

  • system stability
  • system gain
  • system stability and gain
  • none of the mentioned

40. In a control system integral error compensation                steady state error

  • increases
  • minimizes
  • does not have any effect on
  • all of the mentioned

41. Amplifier:

  • armature controlled fhp dc motor
  • a pair of synchronous transmitter and control transformer
  • tach generator
  • amplidyne

42.                         directly converts temperature into voltage.

  • thermocouple
  • potentiometer
  • gear train
  • lvdt

43. When human being tries to approach an object, his brain acts as,

  • an error measuring device
  • a controller
  • an actuator
  • an amplifier

44. Error detector:

  • armature controlled fhp dc motor
  • a pair of synchronous transmitter and control transformer
  • tach generator
  • amplidyne

45. Root locus of s(s+2)+K(s+4) =0 is a circle. What are the coordinates of the center of this circle?

  • -2,0
  • -3,0
  • -4,0
  • -5,0

46.                        is a quantitative measure of how fast the transients die out in the system.

  • absolutely stable
  • conditionally stable
  • unstable
  • relative stability

47. A linear system can be classified as :

  • absolutely stable
  • conditionally stable
  • unstable
  • all of the mentioned

48. If root of the characteristic equation has positive real part the system is :

  • stable
  • unstable
  • marginally stable
  • linear

49. If the roots of the have negative real parts then the response is                          

  • stable
  • unstable
  • marginally stable
  • bounded

50. If the impulse response in absolutely integrable then the system is :

  • absolutely stable
  • unstable
  • linear
  • stable

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