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Electrical Machines

Electrical Machines
When a transformer is loaded, the secondary terminal voltage drops. That means power factor is

 unity.
  lagging.
 leading.
 zero.

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Electrical Machines
Direction of the current in the compensating winding is________ to the direction of current in the armature conductors?

 exactly opposite
 same
None of these
 either of these

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Electrical Machines
Which of the following motor has more stability

None of these
 cylindrical motor
 salient pole motor
 both motors has same stability

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Electrical Machines
The self induced emf in the coil undergoing commutation is called the

  reactance voltage.
  dynamically induced voltage.
None of these
  statically induced voltage.

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Electrical Machines
As compared to DOL starting, a cage induction motor with star-delta starting shall have

 more starting time.
 more starting torque.
 smoother acceleration.
 reduced starting current.

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Electrical Machines
In a DC motor under constant terminal voltage what is the relation between torque (Te) and power (P)

 T∝ P
 T∝ P²
 T∝ P³
 T is independent of P

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