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Electrical Machines

Electrical Machines
If the applied voltage of a DC motor is 230 V, then back emf, for maximum power developed is

 230 V.
 115 V.
 200 V.
 460 V.

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Electrical Machines
In an alternator the voltage generated per phase is proportional to

All of these
  flux per pole.
  number of turns in coil.
  frequency of waveform.

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Electrical Machines
For standing a DC motor a starter is required because

  It starts the motor.
  it limits the speed of the motor.
None of these
  it limits the starting current to a safe value.

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Electrical Machines
The commutator segments of DC machines are made up of

 copper
 brass
 hard-drawn copper
 copper alloy

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Electrical Machines
What is/are the advantages of parallel operation of alternators?

All of these
 Increase in reliability
 continuity supply is maintained
 Increase efficiency under light load conditions

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Electrical Machines
A commutator in dc machine provide ----------------- rectification?

 half wave controlled
 full wave controlled
 half wave
 full wave

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