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Electrical Machines

Electrical Machines
In a 6 pole DC machine, 90 mechanical degrees correspond to which of the following electrical degree?

 30.
 180.
 45.
  270.

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Electrical Machines
In a single phase induction motor, the starting torque developed is proportional to

 V²
 1/V²
 supply voltage V
 1/V

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Electrical Machines
When excitation is increased (over excitation), the synchronous generator operates at

 unity power factor.
 leading power factor.
 any of the above.
 lagging power factor.

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Electrical Machines
In a transformer the magnetic coupling between the primary and secondary winding can be increased by

 using the magnetic core of low reluctance.
 increasing the number of turns.
 using soft material for winding.
 using transformer oil of better quality.

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Electrical Machines
High inrush of current during a starting of DC motor can efficiently be restricted to a safer value by increasing the _________________ resistance.

 shunt field
 both A and B
 armature circuit
 none of above

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Electrical Machines
The direction of rotation of a DC motor can be determined by

 Fleming's right hand rule.
  Fleming's left hand rule.
 Ampere's law.
 Lenz's law.

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