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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

 460 V.
 115 V.
 230 V.
 200 V.

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Electrical Machines
A self-excited shunt generator fails to build up, because 1. the field circuit is open 2. The armature circuit is open 3. the residual magnetism is absent 4. The direction of rotation is wrong From these, the correct answer is

 1, 2 and 3
 3 only
 1, 3
 1, 2, 3 and 4

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Electrical Machines
Magnetic field of a DC generator is produced by what?

 None of the options.
 Both B and C.
  Electromagnets.
 Permanent magnets.

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Electrical Machines
The frequency of voltage generated by an alternator having 8 poles and rotating at 250 rpm is

  16.67 Hz.
  25 Hz.
  50 Hz.
  60 Hz.

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Electrical Machines
Skewing of cage rotors offers the following advantages

  less noise.
  locking tendency is reduced.
  all of below.
  uniform torque.

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Electrical Machines
A motor operates in stable region at which of the following slip?

 both 1 and 2
 low slip region
 unity slip
 high slip region

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