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Electrical Machines

Electrical Machines
A DC generator without commutator is a

 DC generator
 DC motor
 induction motor
 AC generator

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Electrical Machines
The armature MMF waveform of a DC machine is

  triangular.
  pulsating.
  rectangular.
  sinusoidal.

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Electrical Machines
Which of the following is/are the advantages of carbon brush over the copper brush?

All of these
 They are not hard as copper brush
 In case of any sparking they will be less damaged than copper brushes
 They are self lubricating in nature

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Electrical Machines
The voltage regulation of a DC generator at full load being zero implies that the generator is

  deferentially compounded.
 shunt connected.
  cumulatively compounded.
  series connected.

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Electrical Machines
What will be the maximum power factor of an induction motor for dispersion coefficient of 0.05?

 1.1.
  0.05.
 20.
  0.905.

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Electrical Machines
A 240 V dc series motor takes 40 A when giving its rated output at 1500 rpm. Its resistance is 0.3 Ω. The value of resistance which must be added to obtain rated torque at 1000 rpm is

 6 Ω
 5.7 Ω
 1.9 Ω
 2.2 Ω

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