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Electrical Machines

Electrical Machines
If the applied voltage to a dc machine is 230 V, then the back emf, for maximum power developed, is

 115 V
 460 V
 230 V
 200 V

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Electrical Machines
Breadth factor is defined as the ratio of

 emf with concentrated winding to emf with distributed winding.
 emf with distributed winding to emf with concentrated winding.
None of these
 both 1 and 2.

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

 1/V²
 V²
 1/V
 supply voltage V

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Electrical Machines
Which of the following induction motor has maximum speed?

 4 pole.
  2 pole.
 8 pole.
 6 pole.

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Electrical Machines
In a transformer, the frequency of a voltage at the secondary is

 greater than the primary.
 less than primary.
 any of the above.
 equal to primary.

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

None of these
 either of these
 exactly opposite
 same

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