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Electrical Machines

Electrical Machines
A 3 phase stepper motor has 6 stator poles and 4 rotor poles, then find the step angle?

 45°
 30°
 10°
 60°

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Electrical Machines
Which of the following transformer insulating oil generally used in India?

  Paraffin based insulating oil.
 Aromatics based insulating oil.
 Olefin based insulating oil.
 Naphtha based insulating oil.

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Electrical Machines
In DC generator, brushes are always placed along

 load axis.
  magnetic neutral axis.
 geometrical neutral axis.
 armature axis.

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Electrical Machines
A 220 V DC machine has an armature resistance 1Ω. If the full load current is 20 A, the difference of induced voltage and generator is

 60 V.
 0 V.
  40 V.
 20 V.

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Electrical Machines
The direction of rotation of a 3 - Φ induction motor can be reversed by

  disconnecting any one phase.
  transposing any two leads from slip rings.
  transposing all the three leads from the supply.
  transposing any two leads from supply.

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Electrical Machines
In DC generator on no-load, the air gap flux distribution in space is

  sinusoidal.
  pulsating.
 triangular.
  flat topped.

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