☰ DC Machines (Electrical Engineering) - MCQs

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Q61.

the sparking at the brushes, in a DC machine, is due to

  • A. armature reaction
  • B. reactance voltage
  • C. presence of commutator
  • D. high resistance of carbon brushes
    ✍ Discuss    
Q62.

the self induced EMF in the coil undergoing commutation is called the

  • A. reactance voltage
  • B. statically induced voltage
  • C. dynamically induced voltage
  • D. none of the above
    ✍ Discuss    
Q63.

in a DC machine the sparking between brushes and commutator surface may be due to

  • A. under commutation
  • B. over competition
  • C. too rapid reversal of current
  • D. any of the above
    ✍ Discuss    
Q64.

under commutation results in

  • A. sparking at the middle of the brush
  • B. sparking at the leading edge of the brush
  • C. sparking at the trailing edge of the brush
  • D. non sparking
    ✍ Discuss    
Q65.

in a DC machine, the space waveform of the air flux distribution affects

  • A. torque only
  • B. voltage only
  • C. both the torque and voltage
  • D. neither the torque nor the voltage
    ✍ Discuss    
Q66.

in a DC machine, the actual flux distribution depends upon

  • A. size of air gap
  • B. shape of pole shoes
  • C. clearance between tips of the adjacent pole shoes
  • D. all of the above
    ✍ Discuss    
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