Constructional Features of Rotating Electrical Machines-1 MCQ

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• Why is the air gap between stator and rotor should be kept as small as mechanically possible in induction motor?
  ক

  to reduce the leakage flux between stator and rotor

  খ

  as it leads to better operating power factor of the induction motor

  গ

  reduce the eddy current losses

  ঘ

  both, to reduce leakage flux between stator and rotor, and also for better operating power factor
• Armature winding is one in which working ___________
  ক

  flux is produced by field current

  খ

  flux is produced by the working emf

  গ

  emf is produced by the working flux

  ঘ

  emf is produced by the leakage flux
• What is the reason behind armature structure for both DC and AC machines being laminated?
  ক

  reduce i2R losses

  খ

  reduce the leakage flux

  গ

  reduce the eddy current losses

  ঘ

  for better operating power factor
• The power rating of the field winding is ___________
  ক

  equal to the power rating of the machine

  খ

  1/2 to 2% of the rated power of the machine

  গ

  greater than the power rating of the machine

  ঘ

  less than the power rating of the machine
• The rating of the armature winding is ___________
  ক

  1/2 to 2% of the rated power of the machine

  খ

  less than the power rating of the machine

  গ

  greater than the power rating of the machine

  ঘ

  equal to the power rating of the machine
• Current in the field winding is ___________
  ক

  AC always

  খ

  DC always

  গ

  Both AC and DC

  ঘ

  Either AC or DC
• Field winding carries which of the following current?
  ক

  exciting current only

  খ

  load current only

  গ

  both exciting current and load current

  ঘ

  none of the mentioned
• Armature winding carries which of the following current?
  ক

  magnetizing current only

  খ

  load current only

  গ

  both magnetizing current and load current

  ঘ

  none of the mentioned
• Which of the following two windings produces/induces the working flux and working EMF respectively?
  ক

  field winding and armature winding

  খ

  armature winding and field winding

  গ

  both are produced in field winding

  ঘ

  both are produced in armature winding