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MCQs

Total Questions : 604 | Page 3 of 61 pages
Question 21. A system is highly oscillatory if
  1.    Gain margin is high
  2.    Gain margin is close to 1
  3.    Gain margin is close to 1 or phase margin is zero
  4.    Gain margin is high and phase margin is 180°
 Discuss Question
Answer: Option C. -> Gain margin is close to 1 or phase margin is zero
Question 22. In a two phasor servomotor, the direction of rotation of the rotating field depends on
  1.    Magnitudes of voltages applied to the two stator windings
  2.    Phase relation of voltages applied to the two stator windings
  3.    Both magnitude and phase relationship of voltages applied to the two stator windings
  4.    None of the above
 Discuss Question
Answer: Option B. -> Phase relation of voltages applied to the two stator windings
Question 23. Which of the following is open loop system?
  1.    Wind screen wiper
  2.    Aqualing
  3.    Respiratory system of animal
  4.    System for controlling antirocket missiles
 Discuss Question
Answer: Option A. -> Wind screen wiper
Question 24. The poles with greater displacement from the real axis correspond to
  1.    Higher frequencies of oscillations
  2.    Stable response
  3.    Lower frequencies of oscillations
  4.    Unbounded output
 Discuss Question
Answer: Option A. -> Higher frequencies of oscillations
Question 25. The sensor generally used in incremental optical encoder is
  1.    LED
  2.    LCD
  3.    Photodiode
  4.    Either (a) or (b)
 Discuss Question
Answer: Option C. -> Photodiode
Question 26. 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 27. Magnetic amplifier is used for
  1.    Voltage amplification
  2.    Power amplification
  3.    Current amplification
  4.    Frequency amplification
 Discuss Question
Answer: Option B. -> Power amplification
Question 28. Nichols chart consists of
  1.    Constant magnitude loci
  2.    Constant phase angle loci
  3.    Magnitude and phase angle loci in log-magnitude versus phase diagram
  4.    None of the above
 Discuss Question
Answer: Option C. -> Magnitude and phase angle loci in log-magnitude versus phase diagram
Question 29. Nyquist stability criterion uses open loop frequency response characteristics.
  1.    True
  2.    False
 Discuss Question
Answer: Option A. -> True
Question 30. Which control action can never be used alone?
  1.    Proportional
  2.    Derivative
  3.    Integral
  4.    Both (b) and (c)
 Discuss Question
Answer: Option B. -> Derivative

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