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MCQs

Total Questions : 125 | Page 12 of 13 pages
Question 111. If root loci plots of a particular control system do not intersect the imaginary axis at any point, then the gain margin of the system will be:
  1.    0
  2.    0.707
  3.    1
  4.    infinite
 Discuss Question
Answer: Option D. -> infinite
Question 112. The addition of open loop zero pulls the root loci towards:
  1.    the left and therefore system becomes more stable
  2.    the right and therefore system becomes unstable
  3.    imaginary axis and therefore system becomes marginally stable
  4.    the left and therefore system becomes unstable
 Discuss Question
Answer: Option A. -> the left and therefore system becomes more stable
Question 113. What is the number of the root locus segments which do not terminate on zeroes?
  1.    the number of poles
  2.    the number of zeroes
  3.    the difference between the number of poles and zeroes
  4.    the sum of the number of poles and the number of the zeroes
 Discuss Question
Answer: Option C. -> the difference between the number of poles and zeroes
Question 114. Which one of the following are correct? The root locus is the path of the roots of the characteristic equation traced out in the s- plane?
  1.    as the input of the system is changed
  2.    as the output of the system is changed
  3.    as a system parameter is changed
  4.    as the sensitivity is changed
 Discuss Question
Answer: Option C. -> as a system parameter is changed
Question 115. The breakaway point calculated mathematically must always lie on the root locus
  1.    true
  2.    false
 Discuss Question
Answer: Option A. -> true
Question 116. Routh Hurwitz criterion is better than root locus
  1.    true
  2.    false
 Discuss Question
Answer: Option B. -> false
Question 117. When the number of poles is equal to the number of zeroes, how many branches of root locus tends towards infinity?
  1.    1
  2.    2
  3.    equal to number of zeroes
  4.    none of the above
 Discuss Question
Answer: Option C. -> equal to number of zeroes
Question 118. When human being tries to approach an object, his brain acts as,
  1.    an error measuring device
  2.    a controller
  3.    an actuator
  4.    an amplifier
 Discuss Question
Answer: Option B. -> a controller
Question 119. A phase lag lead network introduces in the output
  1.    lag at all frequencies
  2.    lag at high frequencies and lead at low frequencies
  3.    lag at low frequencies and lead at high frequencies
  4.    none of the above
 Discuss Question
Answer: Option C. -> lag at low frequencies and lead at high frequencies
Question 120. Hydraulic torque transmission system is analog of
  1.    amplidyne set
  2.    resistance-capacitance parallel circuit
  3.    motor-generator set
  4.    any of the above
 Discuss Question
Answer: Option C. -> motor-generator set

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