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Electrical Machines

Electrical Machines
A 4-pole DC generator runs at 1500 rpm. The frequency of current in the armature winding is:

 Zero Hz.
 100 Hz.
 50 Hz.
 25 Hz.

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Electrical Machines
Maximum power developed by a synchronous motor depends on

 supply voltage, load angle and excitation
 supply voltage and load angle
 supply voltage and excitation
 excitation and load angle

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Electrical Machines
The magnetic field which initially induces emf in the armature in a self excited DC generator is because of

  residual magnetism.
  permanent magnets.
 armature reaction.
None of these

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Electrical Machines
The armature shaft must be able to with stand

All of these
 Twisting stains due to transmission of torque.
 Any unbalanced magnetic pull on the armature core.
 Bending moment due to weight of the armature.

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Electrical Machines
Scott connections are used for

 any of the above.
 three phase to two phase transformation.
 single phase to three phase transformation.
 three phase to single phase transformation.

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Electrical Machines
What type of connection is made in between the inter-pole and the field winding?

  Series.
 None of the options.
 Parallel.
 Compound.

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