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Electrical Machines

Electrical Machines
In salient pole synchronous machine, maximum power occurs at a load angle of

 0°
 90°
 less than 90°
 Greater than 90°

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Electrical Machines
To eliminate the 5th harmonic in the induced voltages their respective pitch factor angle should be

 18°
 30°
 36°
 72°

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Electrical Machines
Short circuiting is caused in the armature winding due to

  grounding of two or more turns of the same coil.
  failure of insulation between two turns of coil.
 failure of insulation between two commutator bars.
  any of above.

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Electrical Machines
Universal motor have which of the following application?

  Domestic pump.
  Lift.
  Food mixer.
  Traction.

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Electrical Machines
In synchronous motor the torque is proportional to

 P²
 Power P
 1/P²
 1/P

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Electrical Machines
Neglecting all losses, the developed torque (T) of DC separately excited motor, operating under constant terminal voltage is reduced to its output power (P) as

 T2 ∝ P3.
 T is independent of P.
 T ∝ P.
 T ∝ √P.

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MORE MCQ ON Electrical Machines

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