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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?

 30°
 45°
 60°
 10°

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Electrical Machines
In a DC generator sparking between brushes and commutator surface may be due to

  under commutation.
  too rapid reversal of current.
 over commutation.
  any of the above.

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Electrical Machines
The effect of ------------------ on main field flux is armature reaction?

All of these
 armature current
 armature mmf
 armature flux

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Electrical Machines
Unbalanced supply voltage given to a 3 - φ, delta connected induction motor will cause

  negative sequence current.
  less heating of the rotor.
  all of these.
  less heating of the rotor.

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Electrical Machines
A large series motor is never started without some mechanical on it because otherwise it will

 Draw too much current.
 Open fuse or circuit breaker.
 Produce sparking at brushes.
  Develop excessive speed and damage itself.

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Electrical Machines
A DC generator can be considered as

 power pump.
 prime mover.
 rectifier.
 rotating amplifier.

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MORE MCQ ON Electrical Machines

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