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MCQs

Total Questions : 95 | Page 8 of 10 pages
Question 71. A system is highly oscillatory if
  1.    Gain margin is close to 1
  2.    Gain margin is close to 1 or phase margin is zero
  3.    Gain margin is high and phase margin is 180°
  4.    Gain margin is high
 Discuss Question
Answer: Option B. -> Gain margin is close to 1 or phase margin is zero
Question 72. In a two phasor servomotor, the direction of rotation of the rotating field depends on
  1.    Both magnitude and phase relationship of voltages applied to the two stator windings
  2.    None of these
  3.    Phase relation of voltages applied to the two stator windings
  4.    Magnitudes of voltages applied to the two stator windings
 Discuss Question
Answer: Option C. -> Phase relation of voltages applied to the two stator windings
Question 73. The sensor generally used in incremental optical encoder is
  1.    Either (a) or (b)
  2.    LED
  3.    LCD
  4.    Photodiode
 Discuss Question
Answer: Option D. -> Photodiode
Question 74. Which of the following is open loop system?
  1.    Respiratory system of animal
  2.    System for controlling antirocket missiles
  3.    Wind screen wiper
  4.    Aqualing
 Discuss Question
Answer: Option C. -> Wind screen wiper
Question 75. The poles with greater displacement from the real axis correspond to
  1.    Lower frequencies of oscillations
  2.    Higher frequencies of oscillations
  3.    Unbounded output
  4.    Stable response
 Discuss Question
Answer: Option B. -> Higher frequencies of oscillations
Question 76. In force current analogue, mechanical mobility is analogous to
  1.    Impedance Z
  2.    Admittance Y
  3.    Reactance X
  4.    Conductance G
 Discuss Question
Answer: Option A. -> Impedance Z
Question 77. Which control action can never be used alone?
  1.    Integral
  2.    Proportional
  3.    Both (b) and (c)
  4.    Derivative
 Discuss Question
Answer: Option D. -> Derivative
Question 78. Magnetic amplifier is used for
  1.    Power amplification
  2.    Frequency amplification
  3.    Current amplification
  4.    Voltage amplification
 Discuss Question
Answer: Option A. -> Power amplification
Question 79. Nichols chart consists of
  1.    None of these
  2.    Constant phase angle loci
  3.    Constant magnitude loci
  4.    Magnitude and phase angle loci in log-magnitude versus phase diagram
 Discuss Question
Answer: Option D. -> Magnitude and phase angle loci in log-magnitude versus phase diagram
Question 80. Nyquist stability criterion uses open loop frequency response characteristics.
  1.    True
  2.    False
 Discuss Question
Answer: Option A. -> True

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