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Electrical Machines

Electrical Machines
The material used for commutator brushes is mostly

 mica.
 cast iron.
  carbon.
 copper.

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

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

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Electrical Machines
A separately-excited DC generator, running at rated speed, has 6 volts across its armature terminals with no field current. When field winding is excited with one ampere, the voltage builds up to 250 V at no load. In case field current is reduced to zero, with the speed remaining unaltered, the armature terminal voltage would be

 zero
 less than 6 V
 6 V
 more than 6 V

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Electrical Machines
In shaded pole induction motors, the flux moves from ------------- region to ----------------- region respectively?

 shaded, unshaded
 shaded, shaded
 unshaded, shaded
 unshaded, unshaded

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

 60°
 30°
 10°
 45°

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Electrical Machines
In DC machines shape of net flux density is?

 saddle shape
 peaky in nature
 flat tapped or trapezoidal
 sine wave

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