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Total Questions : 604 | Page 59 of 61 pages
Question 581. 9. The dopen loop transfer function of a unity feedback system is given by 3e-2G(s) - s(s+ 2) The gain and phase crossover frequencies in rad/sec are, respectively
  1.    0.63 and 1.26
  2.    0.632 and 0.485
  3.    0.485 and 0.632
  4.    1.26 triA and 0.632 V
 Discuss Question
Answer: Option D. -> 1.26 triA and 0.632 V
Question 582. 0.  The dopen loop transfer function of a unity feedback system is given by 3e-2G(s) - s(s+ 2) Based on the above results, the gain and phase margins of the system will be
  1.    -7.09 and 87.5?
  2.    7.09 and 87.5?
  3.    7.09dB and -87.50
  4.    -7.09dB and -87.5?
 Discuss Question
Answer: Option D. -> -7.09dB and -87.5?
Question 583. 3.  Consider two transfer functions Gi(s)=s2+as+b and G2(s) =S2 -i-as+b The 3-dB bandwidths of their frequency responses are, respectively
  1.    Ara7-711) ,A/T-74b
  2.    , VT-71b
  3.    , Nra-f=111;
  4.    41) 421
 Discuss Question
Answer: Option B. -> , VT-71b
Question 584. 5.  The transfer function of a phase-lead compensator is given by 1+ 3Ts 1+Ts where T > 0 The maximum phase-shift provided by such a compensator is It
  1.    1
  2.    2
  3.    3
  4.    4
 Discuss Question
Answer: Option D. -> 4
Question 585. 4.  The Nyquist plot of G (Jm) H (Jo)) for a closed loop control system, passes through (-1, j0) point in the CH plane. The gain margin of the system in dB is equal to
  1.    infinite
  2.    greater than zero
  3.    less than zero
  4.    zero
 Discuss Question
Answer: Option D. -> zero
Question 586. 1.  The open-loop transfer function of a unity-gain feedback control system is given by G(s)= (s +1) (s + 2) The gain margin of the system in dB is given by
  1.    0
  2.    1
  3.    20
  4.    5
 Discuss Question
Answer: Option D. -> 5
Question 587. 2.  For the function of a complex variable W = In Z (where, W = u + jv and Z = x + jy), the u = constant lines get mapped in 1-plane as
  1.    set of radial straight lines
  2.    set of concentric circles
  3.    set of confocal hyperbolas
  4.    set of confocalellipses
 Discuss Question
Answer: Option B. -> set of concentric circles
Question 588. 6.  Consider a unity-gain feedback control system whose open-loop transfer function is as +1 G(s) = s2 The value of 'a' so that the system has a phase-margin equal to ? is approximately equal to
  1.    2.4
  2.    1.4
  3.    0.84
  4.    0.74
 Discuss Question
Answer: Option C. -> 0.84
Question 589. 9.  Four the function approximation around
  1.    (3 - x)e-2
  2.    1 ? x
  3.    [3 +21i -(1+x]e-2
  4.    e-2
 Discuss Question
Answer: Option A. -> (3 - x)e-2
Question 590. 0.  If the closed-loop transfer function of a control system is given as s- 5 T(s) = , then it is (s + 2)(s + 3)
  1.    an unstable system
  2.    an uncontrollable system
  3.    a minimum phase system
  4.    a non-minimum phase system
 Discuss Question
Answer: Option D. -> a non-minimum phase system

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