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Total Questions : 604 | Page 56 of 61 pages
Question 551. 9.  In the GH(s) plane, the Nyquist plot of the loop transfer function G(s)H(s) passes through the negative real axis at the point
  1.    (-0.25, j0)
  2.    (-0.5, j0)
  3.    (-1, j0)
  4.    (-2, j0)
 Discuss Question
Answer: Option B. -> (-0.5, j0)
Question 552. 6.  The following motor definitely has a permanent magnet rotor
  1.    DC commutator motor
  2.    Brushless dc motor
  3.    Stepper motor
  4.    Reluctance motor
 Discuss Question
Answer: Option C. -> Stepper motor
Question 553. 1.  Consider the difference equation of LT1 causal discrete time system y(n) - ? y(n -I) + ? y(n -2) = x(n) The impulse response of the system is1)? (1)n
  1.    2(-211n ? (71)1 u(n)
  2.    [2(-211n ? (71)1 u(n)
  3.    [2()" - (1)1 u(n)
  4.    [2( ,1)n + (1)1 u(n)
 Discuss Question
Answer: Option C. -> [2()" - (1)1 u(n)
Question 554. 3.  The unit step response of a second order linear system with zero initial states is given by c(t) = 1 + 1.25 exp (-6t) sin (8t - tan -I 1.333), t ?_ 0.The damping ratio and the undamped natural frequency of oscillation of the system are respectively
  1.    0.6 and 10 rad/s
  2.    0.6 and 12.5 rad/s
  3.    0.8 and 10 rad/s
  4.    0.8 and 12.5 rad/s
 Discuss Question
Answer: Option A. -> 0.6 and 10 rad/s
Question 555. 5.  If a system has an open loop transfer 1 ? s function ?, then the gain of the 1 + s system at frequency of 1 rad/s will be
  1.    one
  2.    negative
  3.    zero
  4.    very large
 Discuss Question
Answer: Option A. -> one
Question 556. 4.  In th slew range of a stepper motor, it
  1.    can start, stop and reverse as desired
  2.    cannot start but can stop and reverse on command
  3.    cannot start, stop and reverse on command
  4.    cannot start and synchronize but can reverse on command
 Discuss Question
Answer: Option C. -> cannot start, stop and reverse on command
Question 557. 6.  Loop gain vs. phase plot is known as
  1.    Nyquist plot
  2.    Bode plot
  3.    Nichols chart
  4.    Inverse Nyquist plot
 Discuss Question
Answer: Option B. -> Bode plot
Question 558. 2.  The magnitude of 20 log10 Paco)! at = 1000 is - 20 dB. Which of these statements are correct?
  1.    1, 2 and 3
  2.    1 and 2
  3.    2 and 3
  4.    1 and 3
 Discuss Question
Answer: Option B. -> 1 and 2
Question 559. 7.  A.C. Servomotor is a
  1.    3-phase induction motor
  2.    2-phase induction motor
  3.    1-phase induction motor
  4.    2-phase synchronous motor
 Discuss Question
Answer: Option A. -> 3-phase induction motor
Question 560. 8.  Amplidyne is a type of
  1.    Magnetic amplifier
  2.    Rotating amplifier
  3.    Electronic amplifier
  4.    Synchro transformer
 Discuss Question
Answer: Option D. -> Synchro transformer

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