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  • Question

  • Consider the systems with following open loop transfer functions

    1. Consider the systems with following open loop transfer functions If unity feedback is used, the incr
    2. Consider the systems with following open loop transfer functions If unity feedback is used, the incr
    3. Consider the systems with following open loop transfer functions If unity feedback is used, the incr
    If unity feedback is used, the increasing order of time taken for unit step response to settle is


  • Options
  • A. 1, 2, 3
  • B. 3, 1, 2
  • C. 2, 3, 1
  • D. 3, 2, 1

  • Correct Answer
  • 2, 3, 1 

    Explanation
    Consider the systems with following open loop transfer functions If unity feedback is used, the incr. For the three systems the values of ??n are 1.8, 2.5 and 2 respectively.

    Hence values of T are 0.55, 0.4 and 0.5 respectively.

    Automatic Control Systems problems

    Search Results

    • 1. First column elements of Routh's tabulation are 3, 5, , 2. It means that there

    • Options
    • A. is one root in left half s plane
    • B. are two roots in left half s plane
    • C. are two roots in right half s plane
    • D. is one root in right half s plane
      • Discuss
    • 2. For the control system in the given figure, the value of K for critical damping is

    • Options
    • A. 1
    • B. 5.125
    • C. 6.831
    • D. 10
      • Discuss
    • 3. In the given figure, the input frequency is such that R = XC. Then

    • Options
    • A. v0 lags vi by 45°
    • B. v0 lags vi by 90°
    • C. v0 leads vi by 45°
    • D. v0 leads vi by 90°
      • Discuss
    • 4. For the circuit in the given figure, V2(s)/V1(s) =

    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss
    • 5. For the given figure C(s)/R(s)

    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss
    • 6. When a unit step voltage drives a lag network the output

    • Options
    • A. remains constant at unit step value
    • B. increases exponentially from zero to final value
    • C. decreases exponentially from 1 to 0
    • D. either (b) of (c) depending on values of R and C
      • Discuss
    • 7. In a minimum phase system

    • Options
    • A. all poles lie in the left half plane
    • B. all zeros lie in the left half plane
    • C. all poles lie in the right half plane
    • D. all except one pole or zero lie in the left half plane
      • Discuss
    • 8. For the system in the given figure the characteristic equation is

    • Options
    • A.
    • B.
    • C. K(s + 1)(s + 3) = 0
    • D. s(s + 2) = 0
      • Discuss
    • 9. Mechanical impedance is the ratio of

    • Options
    • A. rms force to rms velocity
    • B. rms force to rms displacement
    • C. rms velocity to rms displacement
    • D. none of the above
      • Discuss
    • 10. In a radio receiver with simple AGC

    • Options
    • A. the highest AGC voltage is produced between stations
    • B. the faster the AGC time constant, the more accurate the output
    • C. an increase in signal strength produces more AGC
    • D. the audio stage gain is normally controlled by AGC
      • Discuss

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