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. The frequency and time domain are related through which of the following?

  • Laplace Transform and Fourier Integral
  • Laplace Transform
  • Fourier Integral
  • Either (B) or (C)

2. 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

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

  • e(t)
  • c(t)
  • r(t)
  • s(t)

4. A phase lag lead network introduces in the output

  • lag at all frequencies
  • lag at high frequencies and lead at low frequencies
  • lag at low frequencies and lead at high frequencies
  • none of the above

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

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

6. When the initial conditions of a system are specified to be zero it implies that thesystem is

  • at rest without any energy stored in it
  • working normally with reference input
  • working normally with zero reference input
  • at rest but stores energy

7. Hydraulic torque transmission system is analog of

  • amplidyne set
  • resistance-capacitance parallel circuit
  • motor-generator set
  • any of the above

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

  • charge
  • current
  • inductance
  • resistance

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

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

10. Routh Hurwitz criterion is better than root locus.

  • true
  • false

11. 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
  • none of the above

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

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

13. The effect of error damping is to

  • provide larger settling lime
  • delay the response
  • reduce steady state error
  • any of the above

14. A differentiator is usually not a part of a control system because it

  • reduces damping
  • reduces the gain margin
  • increases input noise
  • increases error

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

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

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

  • scalars
  • adders
  • integrator
  • all of the mentioned

17. 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

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

  • controllability
  • observability
  • differentiability
  • adaptability

19. Which one of the following is not the property of root loci?

  • the root locus is symmetrical about imaginary axis
  • they start from the open loop poles and terminate at the open loop zeroes
  • the breakaway points are determined from dk/ds = 0
  • segments of the real axis are the part of the root locus if and only is the total number of real poles and zeroes to their right is od

20. 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

21. 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

22. What is the number of the root locus segments which do not terminate on zeroes?

  • the number of poles
  • the number of zeroes
  • the difference between the number of poles and zeroes
  • the sum of the number of poles and the number of the zeroes

23. Which one of the following are correct? The root locus is the path of the roots of the characteristic equation traced out in the s- plane?

  • as the input of the system is changed
  • as the output of the system is changed
  • as a system parameter is changed
  • as the sensitivity is changed

24. The breakaway point calculated mathematically must always lie on the root locus.

  • true
  • false

25. 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

26. With feedback___________reduces.

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

27. _____________directly converts temperature into voltage.

  • Thermocouple
  • Potentiometer
  • Gear train
  • LVDT

28. In a control system integral error compensation_____________steady state error

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

29. 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

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

  • i
  • a
  • e-at
  • -eat

31. State model representation is possible using____________

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

32. State space analysis is applicable even if the initial conditions are_______

  • zero
  • non-zero
  • equal
  • not equal

33. Conventional control theory is applicable to____________systems

  • siso
  • mimo
  • time varying
  • non-linear

34. An amplidyne can give which of the following characteristics ?

  • Constant current
  • Constant voltage
  • Constant current as well as constant voltage
  • Constant current, constant voltage and constant power

35. Technique is not applicable to nonlinear system ?

  • Nyquist Criterion
  • Quasi linearization
  • Functional analysis
  • Phase-plane representation

36. 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

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

  • instability
  • bandwidth
  • overall gain
  • distortion

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

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

39. 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

40. Real distinct and negative.

  • center
  • focus point
  • saddle point
  • stable node

41. Real and equal but with opposite sign.

  • center
  • focus point
  • saddle point
  • stable node

42. Pure imaginary pair:

  • centre
  • focus point
  • saddle point
  • stable node

43. Servomotor:

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

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

  • controllable
  • uncontrollable
  • observable
  • unstable

45. Amplifier:

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

46. Kalman’s test is for :

  • observability
  • controllability
  • optimality
  • observability and controllability

47. Kalman’s test is for :

  • observability
  • controllability
  • optimality
  • observability and controllability

48. 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

49. 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

50. Complex conjugate pair:

  • center
  • focus point
  • saddle point
  • stable node

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