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MCQs

Total Questions : 473 | Page 9 of 48 pages
Question 81. In case the air gap in an induction motor is increased
  1.    The magnetizing current of the rotor will decrease
  2.    The power factor will decrease
  3.    Speed of motor will increase
  4.    The windage losses will increase
 Discuss Question
Answer: Option B. -> The power factor will decrease
Question 82. For driving high inertia loads best type of induction motor suggested is
  1.    Slip ring type
  2.    Squirrel-cage type
  3.    Any of the above
  4.    None of the above
 Discuss Question
Answer: Option A. -> Slip ring type
Question 83. An induction motor can run at synchronous speed when
  1.    It is run on load
  2.    It is run in reverse direction
  3.    It is run on voltage higher than the rated voltage
  4.    e.m.f. is injected in the rotor circuit
 Discuss Question
Answer: Option D. -> e.m.f. is injected in the rotor circuit
Question 84. Slip ring motor is preferred over squirrel cage induction motor where
  1.    High starting torque is required
  2.    Load torque is heavy
  3.    Heavy pull out torque is required
  4.    All of the above
 Discuss Question
Answer: Option A. -> High starting torque is required
Question 85. A change of 4% of supply voltage to an induction motor will produce a change of approximately
  1.    4% in the rotor torque
  2.    8% in the rotor torque
  3.    12% in the rotor torque
  4.    16% in the rotor torque
 Discuss Question
Answer: Option D. -> 16% in the rotor torque
Question 86. If an induction motor with certain ratio of rotor to stator slots, runs at 1/7 of the normal speed, the phenomenon will be termed as
  1.    Humming
  2.    Hunting
  3.    Crawling
  4.    Cogging
 Discuss Question
Answer: Option C. -> Crawling
Question 87. The 'cogging' of an induction motor can be avoided by
  1.    Proper ventilation
  2.    Using DOL starter
  3.    Autotransformer starter
  4.    Having number of rotor slots more or less than the number of stator slots (not equal)
 Discuss Question
Answer: Option D. -> Having number of rotor slots more or less than the number of stator slots (not equal)
Question 88. The power scale of circle diagram of an induction motor can be found from
  1.    Stator resistance test
  2.    No-load test only
  3.    Short-circuit test only
  4.    None of the above
 Discuss Question
Answer: Option C. -> Short-circuit test only
Question 89. In a three-phase induction motor, the number of poles in the rotor winding is always
  1.    Zero
  2.    More than the number of poles in stator
  3.    Less than number of poles in stator
  4.    Equal to number of poles in stator
 Discuss Question
Answer: Option D. -> Equal to number of poles in stator
Question 90. Which type of bearing is provided in small induction motors to support the rotor shaft?
  1.    Ball bearings
  2.    Cast iron bearings
  3.    Bush bearings
  4.    None of the above
 Discuss Question
Answer: Option A. -> Ball bearings

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