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MCQs

Total Questions : 95 | Page 3 of 10 pages
Question 21. If poles lie in first quadrant, damping ratio is
  1.     1
  2.     More than 1
  3.     less than 1
  4.     Zero
 Discuss Question
Answer: Option C. ->  less than 1
Question 22. Bandwidth is proportional to speed of response.
  1.     True
  2.     False
  3.     Both (a) and (b)
  4.     Neither (a) nor (b)
 Discuss Question
Answer: Option A. ->  True
Question 23. The permanent magnet field system of brushless dc servo- motor is generally on
  1.     Stator
  2.     Rotor
  3.     Partly on stator and partly on rotor
  4.     Either (a) or (b)
 Discuss Question
Answer: Option B. ->  Rotor
Question 24. The distance of poles from origin depends on
  1.     Uqndamped natural frequency
  2.     Damping ratio
  3.     Both A and B
  4.     Neither A nor B
 Discuss Question
Answer: Option A. ->  Uqndamped natural frequency
Question 25. Which of the following is correct?
  1.     Speed torque characteristics of permanent magnet dc servomotor is more flat than that of wound field dc servomotor
  2.     Speed torque characteristics of wound field dc servo- motor is more flat than that of per-manent magnet dc servo motor
  3.     Speed torque characteristics of wound field and permanent magnet dc servomotor are equally flat
  4.     None of the above
 Discuss Question
Answer: Option A. ->  Speed torque characteristics of permanent magnet dc servomotor is more flat than that of wound field dc servomotor
Question 26. Dc tachogenerator can be used in
  1.     Speed control system
  2.     Position control system
  3.     Both A and B
  4.     Neither A nor B
 Discuss Question
Answer: Option C. ->  Both A and B
Question 27. Which dc servomotor requires strongest permanent magnet?
  1.     Slotted armature
  2.     Surface wound armature
  3.     Surface wound with stationary rotor
  4.     Either A or B
 Discuss Question
Answer: Option C. ->  Surface wound with stationary rotor
Question 28. Which of the following is used to obtain output position in a position control system?
  1.     Strain gauge
  2.     Load cell
  3.     Synchro
  4.     Thermistor
 Discuss Question
Answer: Option B. ->  Load cell
Question 29. Which of the following features is not associated with nichols chart?
  1.     (0 dB, -180°) point on Nichols chart represent critical Point (-1, 0)
  2.     It is symmetric about -180°
  3.     M loci are centred about (0 dB, -180°) point
  4.     The frequency at intersection of G(j?) locus and M = +3 dB locus gives bandwidth of closed loop system
 Discuss Question
Answer: Option D. ->  The frequency at intersection of G(j?) locus and M = +3 dB locus gives bandwidth of closed loop system
Question 30. The complicated shapes in the polar plots are only due to time constants in the numerator of transfer functions.
  1.     True
  2.     False
  3.     Always occur in complex conjugate pairs
  4.     None of the above
 Discuss Question
Answer: Option A. ->  True

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