MMF Produced by Distributed Windings MCQ

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• In a DC machine, z, p, Ia and a are respectively the number of conductors, number of poles, armature current and number of parallel paths. The peak value of fundamental component of armature MMF wave is ____________ b) 8/Π2 c) 4/Π d) 8/Π2
  ক

  8/Π] c) 4/Π] d) 8/Π2] View Answer]

  খ

  (z/2p)(Ia/a)

  গ

  (z/2p)(Ia/a)

  ঘ

  (z/2p)(Ia/a)
• A sinusoidal current sheet in a rotating electrical machine has peak value along q-axis. The peak value of sinusoidal MMF would be ___________
  ক

  in phase with current peak

  খ

  90° lagging the current peak

  গ

  90° leading the current peak

  ঘ

  may lag or lead depending upon the type of machine
• A winding of 20 full pitched series turns, distributed over a band of 60° under each pole, carries a current of 3A. The winding produces a uniform current sheet of density (in AT’s per electrical radiangs) of ___________
  ক

  180/Π

  খ

  120/Π

  গ

  90/Π

  ঘ

  60/Π
• MMF produced by one N-turn coil carrying a current i is ____________
  ক

  rectangular of amplitude Ni/2

  খ

  trapezoidal of amplitude Ni/2

  গ

  rectangular of amplitude Ni

  ঘ

  trapezoidal of amplitude Ni
• A uniformly distributed winding on the stator has three full pitched coils, each coil having N turns and each turn carrying a current i. The MMF produced by the winding is?
  ক

  sinusoidal in waveform with an amplitude 3Ni

  খ

  sinusoidal in waveform with an amplitude 3Ni/2

  গ

  trapezoidal in waveform with an amplitude of 3Ni

  ঘ

  trapezoidal in waveform with an amplitude of 3Ni/2
• A current sheet with sinusoidal current produces?
  ক

  sinusoidal MMF wave lagging it by 90°

  খ

  sinusoidal MMF wave leading it by 90°

  গ

  trapezoidal MMF wave leading it by 90°

  ঘ

  trapezoidal MMF wave lagging it by 90°
• Which of the following statements are correct regarding the current sheet?
  ক

  it is a thin strip of conducting material carrying the current in the dot

  খ

  it is wrapped around stator or rotor

  গ

  it develops MMF identical to that produced by the winding it replaces

  ঘ

  any of the mentioned
• The armature MMF wave in a DC machine is ____________
  ক

  sinusoidal and depends on the speed

  খ

  square and independent of speed

  গ

  triangular and depends on speed

  ঘ

  triangular and independent of speed
• Peak value of fundamental component of MMF produced by one N-turn coil carrying a current ‘i’ is ____________
  ক

  4/Π(Ni)

  খ

  2/Π(Ni)

  গ

  1/Π(Ni)

  ঘ

  1/2Π(Ni)
• If the current in a coil is AC, the amplitude of MMF ___________
  ক

  varies with time but not with space

  খ

  varies with space but not with time

  গ

  varies with both space and time

  ঘ

  doesn’t vary with both space and time
• If the current in the coil is DC, then MMF doesn’t vary with ____________
  ক

  space

  খ

  time

  গ

  both space and time

  ঘ

  none of the mentioned
• A knowledge of the air gap flux distribution in a machine helps in determining the ___________
  ক

  generated EMF waveform and its magnitude

  খ

  electrical torque

  গ

  winding MMF

  ঘ

  both generated EMF waveform and electrical torque
• The winding MMF in rotating machines depends on ___________
  ক

  winding arrangement

  খ

  winding current

  গ

  air gap length,slot openings etc

  ঘ

  both winding arrangement and winding current