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MCQs

Total Questions : 95 | Page 5 of 10 pages
Question 41. 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 42. 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 43. 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 44. Nyquist stability criterion uses open loop frequency response characteristics.
  1.     True
  2.     False
  3.     Integral
  4.     Both (b) and (c)
 Discuss Question
Answer: Option A. ->  True
Question 45. If the poles lie in second quadrant, damping ratio is
  1.     1
  2.     less than 1
  3.     zero
  4.     more than 1
 Discuss Question
Answer: Option B. ->  less than 1
Question 46. In force current analogy, displacement x is analogous to
  1.     Charge
  2.     Magnetic flux linkage
  3.     Electrostatic energy
  4.     Voltage
 Discuss Question
Answer: Option B. ->  Magnetic flux linkage
Question 47. The addition of a pole to the open loop transfer function pulls the root locus
  1.     To the right
  2.     To the left and making the system more stable
  3.     Towards right or left depending on the position of new pole
  4.     None of the above
 Discuss Question
Answer: Option A. ->  To the right
Question 48. For any transfer function, the constant phase angle loci are
  1.     A family of circles
  2.     A family of straight lines
  3.     Either (a) or (b)
  4.     Neither (a) nor (b)
 Discuss Question
Answer: Option A. ->  A family of circles
Question 49. A conditionally stable system is stable for the value of gain between two critical values. it is unstable if
  1.     The gain is increased beyond upper critical value
  2.     The gain is decreased below lower critical value
  3.     Both A and B
  4.     None of the above
 Discuss Question
Answer: Option C. ->  Both A and B
Question 50. Temperature is analogous to
  1.     Voltage
  2.     Flux
  3.     Charge
  4.     None of the above
 Discuss Question
Answer: Option A. ->  Voltage

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