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MCQs

Total Questions : 86 | Page 5 of 9 pages
Question 41. For which of the following applications motor has to start with high acceleration?
  1.    Oil expeller
  2.    Floor mill
  3.    Lifts and hoists
  4.    Centrifugal pump
 Discuss Question
Answer: Option C. -> Lifts and hoists
Question 42. Which of the following motors has series characteristics?
  1.    Shaded pole motor
  2.    Repulsion motor
  3.    Capacitor start motor
  4.    None of the above
 Discuss Question
Answer: Option B. -> Repulsion motor
Question 43. Which part of a motor needs maximum attention for maintenance?
  1.    Frame
  2.    Rearing
  3.    Stator winding
  4.    Rotor winding
 Discuss Question
Answer: Option B. -> Rearing
Question 44. A wound rotor induction motor is preferred, as compared to squirrel cage induction motor, when major consideration is
  1.    Slop speed operation
  2.    High starting torque
  3.    Low windage losses
  4.    All of the above
 Discuss Question
Answer: Option B. -> High starting torque
Question 45. ________ has the least value of starting torque to full load torque ratio.
  1.    D.C. shunt motor
  2.    D.C. series motor
  3.    Squirrel cage induction motor
  4.    Slip ring induction motor
 Discuss Question
Answer: Option C. -> Squirrel cage induction motor
Question 46. The starting torque in case of centrifugal pumps is generally
  1.    Less than running torque
  2.    Same as running torque
  3.    Slightly more than running torque
  4.    Double the running torque
 Discuss Question
Answer: Option A. -> Less than running torque
Question 47. For a D.C. shunt motor which of the following is incorrect?
  1.    Unsuitable for heavy duty starting
  2.    Torque varies as armature current
  3.    Torque armature current is a straight line
  4.    Torque is zero for zero armature current
 Discuss Question
Answer: Option A. -> Unsuitable for heavy duty starting
Question 48. Which of the following happens when star-delta starter is used?
  1.    Starting voltage is reduced
  2.    Starting current is reduced
  3.    Both (A) and (B)
  4.    None of the above
 Discuss Question
Answer: Option C. -> Both (A) and (B)
Question 49. __________ method of starting a three phase induction motor needs six terminals.
  1.    Star-delta
  2.    Resistance starting
  3.    Autotransformer
  4.    None of the above
 Discuss Question
Answer: Option A. -> Star-delta
Question 50. In a paper mill where constant speed is required
  1.    Synchronous motors are preferred
  2.    A.C. motors are preferred
  3.    Individual drive is preferred
  4.    Group drive is preferred
 Discuss Question
Answer: Option C. -> Individual drive is preferred

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