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MCQs

Total Questions : 233 | Page 7 of 24 pages
Question 61. Which of the following statements regarding reluctance-start motor is incorrect ?
  1.    It is similar to reluctance motor
  2.    It is basically an induction motor and not a synchronous one
  3.    So far as its basic working principle is concerned, it is similar to shaded pole motor
  4.    the air-gap between rotor and salient poles is non- uniform
 Discuss Question
Answer: Option A. -> It is similar to reluctance motor
Question 62. For which of the applications a reluctance motor is preferred ?
  1.    Electric shavers
  2.    Refrigerators
  3.    Signalling and timing devices
  4.    Lifts and hoists
 Discuss Question
Answer: Option C. -> Signalling and timing devices
Question 63. The electric motor used in portable drills is
  1.    capacitor run motor
  2.    hysteresis motor
  3.    universal motor
  4.    repulsion motor
 Discuss Question
Answer: Option C. -> universal motor
Question 64. In A.C. series motor compensating winding is employed to
  1.    reduce the effects of armature reaction
  2.    increase the torque
  3.    reduce sparking at the brushes
  4.    none of the above
 Discuss Question
Answer: Option C. -> reduce sparking at the brushes
Question 65. A centrifugal switch is used to disconnect starting winding when motor has
  1.    run for about 1 minute
  2.    run for about 5 minutes
  3.    picked up about 50 to 70 per cent of rated speed
  4.    picked up about 10 to 25 per cent of rated speed
 Discuss Question
Answer: Option C. -> picked up about 50 to 70 per cent of rated speed
Question 66. In a A.C. series motor armature coils are usually connected to commutator
  1.    through resistance
  2.    through reactances
  3.    through capacitors
  4.    solidly
 Discuss Question
Answer: Option A. -> through resistance
Question 67. Direction of rotation of a split phase motor can be reversed by reversing the connection of
  1.    running winding only
  2.    starting winding only
  3.    either (A) or (B)
  4.    both (A) and (B)
 Discuss Question
Answer: Option C. -> either (A) or (B)
Question 68. Which of the following motors is inherently self starting ?
  1.    Split motor
  2.    Shaded-pole motor
  3.    Reluctance motor
  4.    None of these
 Discuss Question
Answer: Option B. -> Shaded-pole motor
Question 69. In which single-phase motor, the rotor has no teeth or winding ?
  1.    Split phase motor
  2.    Reluctance motor
  3.    Hysteresis motor
  4.    Universal motor
 Discuss Question
Answer: Option C. -> Hysteresis motor
Question 70. In a shaded pole single-phase motor, the revolving field is produced by the use of
  1.    inductor
  2.    capacitor
  3.    resistor
  4.    shading coils
 Discuss Question
Answer: Option D. -> shading coils

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