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Electrical Machines

Electrical Machines
The field divertor resistance for a DC series motor is of order of

 0.1 Ω
 100 Ω
 10 Ω
 50 Ω

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Electrical Machines
If field current is decreased in shunt dc motor, the speed of the motor

None of these
 decreases.
 remains same.
 increases.

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Electrical Machines
A commutator in dc machine provide ----------------- rectification?

 half wave
 full wave
 half wave controlled
 full wave controlled

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Electrical Machines
In which transformer, the tertiary winding is used?

 Star - star
 Delta - delta
 Delta - star
 Star - delta

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Electrical Machines
In a DC machine, which of these parameters remain the same whether it runs as a DC motor or a DC generator?

 Can not be determined.
 Induced emf.
 Mechanical power.
 Armature current.

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Electrical Machines
The speed of a 50 Hz three phase induction motor under full load condition is 725 rpm the number of poles of the motor are ______________.

 6.
 4.
  8.
  2.

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