Stability Analysis by Describing Functions MCQ

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• Consider the following statements: 1. The effect of feedback is to reduce the system error 2. Feedback increases the gain of the system in one frequency range but decreases in another. 3. Feedback can cause a system that is originally stable to become unstable Which of these statements are correct.
  ক

  1,2 and 3

  খ

  1 and 2

  গ

  2 and 3

  ঘ

  1 and 3
• The polar plot of a transfer function passes through the critical point (-1,0).Gain margin is
  ক

  zero

  খ

  -1dB

  গ

  1dB

  ঘ

  Infinity
• Transportation lag causes :
  ক

  Instability in system

  খ

  Stability in system

  গ

  System remains unaffected

  ঘ

  Bandwidth increases
• Practically all the systems have transportation lag :
  ক

  True

  খ

  False
• Linear lumped parameter models are not valid under situations as:
  ক

  Transmission pipe between the hydraulic pump and the motor causes a time lag in transportation of oil from pump to motor

  খ

  Transmission of heat by conduction or convection produces serious transportation lag

  গ

  Transmission pipe causes the time lag and loss of heat by conduction and convection

  ঘ

  Transmission of pipe causes neither any time lag nor any heat loss
• Mediums responsible for transportation lag are:
  ক

  Lines

  খ

  Pipes

  গ

  Belt conveyors

  ঘ

  All of the mentioned
• Transportation lag is seen in systems:
  ক

  Amount to be transferred in large

  খ

  Time take to transfer is large

  গ

  Inefficiency of the process

  ঘ

  Errors
• For asymptotes passing from breakaway point then this point is also centroid
  ক

  True

  খ

  False
• The root locus diagram has loop transfer function G(s)H(s) = K/ s(s+4)(s2+4s+5) has
  ক

  No breakaway points

  খ

  Three real breakaway points

  গ

  Only one breakaway points

  ঘ

  One real and two complex breakaway points
• The characteristic equation of a feedback control system is given bys3+5s2+(K+6)s+K=0. In the root loci diagram, the asymptotes of the root loci for large K meet at a point in the s plane whose coordinates are:
  ক

  (2,0)

  খ

  (-1,0)

  গ

  (-2,0)

  ঘ

  (-3,0)