Home / ECE / Automatic Control Systems :: Section 2

ECE :: Automatic Control Systems

  1. Assertion (A): Positive feedback is not used in any circuit.

    Reason (R): Positive feedback leads to instability.

  2. A.
    Both A and R are correct and R is correct explanation of A
    B.
    Both A and R are correct but R is not correct explanation of A
    C.
    A is correct but R is wrong
    D.
    R is correct but A is wrong

    View Answer

    Workspace

    Discuss Discuss in Forum


  3. For the equation where Q is heat energy Gt is thermal conductance and θ is temperature, analogous electrical equation is

  4. A.
    i = G(v1 - v2)
    B.
    C.
    D.

    View Answer

    Workspace

    Discuss Discuss in Forum


  5. If the Nyquist plot does not encircle the (-1 + j0) point the system is always stable.

  6. A.
    True
    B.
    False

    View Answer

    Workspace

    Discuss Discuss in Forum


  7. In op-amp circuit of the given figure, Eo(s)/Ei(s) =

  8. View Answer

    Workspace

    Discuss Discuss in Forum


  9. A system hasFor unit step input the settling time for 2% tolerance band is

  10. A.
    1.6
    B.
    2.5
    C.
    4
    D.
    5

    View Answer

    Workspace

    Discuss Discuss in Forum


  11. A system has transfer function. If a sinusoidal input of frequency ω is applied the steady state output is of the form

  12. A.
    B.
    K1 K2 (1 + jω/T)
    C.
    K1K2/jωT
    D.

    View Answer

    Workspace

    Discuss Discuss in Forum


  13. For the given figure C(s)/R(s) =

  14. View Answer

    Workspace

    Discuss Discuss in Forum


  15. For a quadratic factor in transfer function the phase angle is not a function of damping factor.

  16. A.
    True
    B.
    False

    View Answer

    Workspace

    Discuss Discuss in Forum


  17. The current rating of dc tachogenerator is usually

  18. A.
    small
    B.
    high
    C.
    medium
    D.
    either (b) or (c)

    View Answer

    Workspace

    Discuss Discuss in Forum


  19. For the compensator in the given figure the maximum phase lead is

  20. A.
    sin-1 (1/3)
    B.
    30°
    C.
    45°
    D.
    60°

    View Answer

    Workspace

    Discuss Discuss in Forum