automatic-control-system-mcqs - Set (1)

Correct Answer: Orange && Worng Answer: Red

1. A system with large time constant corresponds to a _____ system.

  • (A). Fast
  • (B). Sluggish
  • (C). Both (a) and (b)
  • (D). None of these
    • View Answer

    Explanation: Not Avilable

    2. The AC servomotor is basically a :

  • (A). Universal motor
  • (B). Capacitor motor
  • (C). 2-Phase induction motor
  • (D). 3-Phase induction motor
    • View Answer

    Explanation: Not Avilable

    3. Error or actuating signal is generated in a :

  • (A). Open loop system
  • (B). Closed loop system
  • (C). Both (a) and (b)
  • (D). None of these
    • View Answer

    Explanation: Not Avilable

    4. In a block diagram error detector _____

  • (A). Changes the input signal
  • (B). Compares the input & Output signal
  • (C). Changes the output signal
  • (D). None of these
    • View Answer

    Explanation: Not Avilable

    5. The drag up rotor employed in a 2-phase induction motor to give :

  • (A). High inertia
  • (B). Low inertia
  • (C). Low torque
  • (D). High torque
    • View Answer

    Explanation: Not Avilable

    6. Damping in a control system is a function of

  • (A). Gain
  • (B). √gain
  • (C). 1/√gain
  • (D). 1/gain
    • View Answer

    Explanation: Not Avilable

    7. Root locus is the plot of the roots of the characteristic equation of a closed loop system against variation in :

  • (A). Gain K
  • (B). Frequency
  • (C). S
  • (D). None of these
    • View Answer

    Explanation: Not Avilable

    8. Slope of factor K in plotting Bode Magnitude curve is :

  • (A). 0°
  • (B). 90°
  • (C). 45°
  • (D). 20°
    • View Answer

    Explanation: Not Avilable

    9. If a zero appears in the first column of the Routh table, the system is :

  • (A). Marginally stable
  • (B). Necessarily stable
  • (C). Necessarily unstable
  • (D). Conditionally stable
    • View Answer

    Explanation: Not Avilable

    10. Which of the following technique provide quick transient and stability response ?

  • (A). Nyquist criterion
  • (B). Nicholas plot
  • (C). Bode plot
  • (D). Root locus
    • View Answer

    Explanation: Not Avilable

    11. The characteristic equation of a closed loop system is given by S²+4S+16=0. The undamped natural frequency in rad/sec is :

  • (A). 2
  • (B). 2√3
  • (C). 4
  • (D). 2√2
    • View Answer

    Explanation: Not Avilable

    12. Which of the following may result in instability problem :

  • (A). Larger error
  • (B). High selectivity
  • (C). Noise
  • (D). High gain
    • View Answer

    Explanation: Not Avilable

    13. In time domain specification, the delay time is the time required for the response to reach :

  • (A). 75% of final value
  • (B). 25% of final value
  • (C). 50% of final value
  • (D). 100% of final value
    • View Answer

    Explanation: Not Avilable

    14. If all the roots of the characteristic equation lie in the left half of S-plane the system will be :

  • (A). Stable
  • (B). Unstable
  • (C). Critically stable
  • (D). None of the above
    • View Answer

    Explanation: Not Avilable

    15. Root locus is used to calculate :

  • (A). Marginal stability
  • (B). Absolute stability
  • (C). Conditional stability
  • (D). Relative stability
    • View Answer

    Explanation: Not Avilable

    16. Which of the test signal are best utilized by the stability analysis ?

  • (A). Impulse
  • (B). Step
  • (C). Ramp
  • (D). Parabolic
    • View Answer

    Explanation: Not Avilable

    17. The critical value of gain for the system is 40. The system is operating at a gain of 20. The gain margin of the system is :

  • (A). 2 dB
  • (B). 3 dB
  • (C). 6 dB
  • (D). 4 dB
    • View Answer

    Explanation: Not Avilable

    18. Addition of zero at the origin causes

  • (A). Improvement in transient response
  • (B). Reduction in steady state error
  • (C). Reduction in settling time
  • (D). Increase in damping constant
    • View Answer

    Explanation: Not Avilable

    19. Multiple signals as input can be used in which systems :

  • (A). Feedback systems
  • (B). Non-feedback systems
  • (C). Any of (a) or (b)
  • (D). Both (a) & (b)
    • View Answer

    Explanation: Not Avilable

    20. The characteristic equation of a system is given by 3S^4 +10S³+5S²+2=0. The system is :

  • (A). Stable
  • (B). Marginally stable
  • (C). Unstable
  • (D). Linear
    • View Answer

    Explanation: Not Avilable

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