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Electrical Machines

Electrical Machines
Find the number of poles required, when the frequency is 50Hz and speed of the motor is 500 rpm?

 12
 10
 24
 5

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Electrical Machines
The armature of DC motor is laminated

 to reduce the mass.
 to reduce the eddy current loss.
 to reduce the inductor.
 to reduce the hysteresis loss.

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Electrical Machines
In dc machines, the field-flux axis and armature-mmf axis are respectively along

 quadrature axis and interpolar axis
 direct axis and indirect axis
 direct axis and interpolar axis
 quadrature axis and direct axis

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Electrical Machines
Direction of rotation of DC motor is reversed by

 Reversing armature connection or field connection.
 Adding resistance to field circuit.
 Reversing supply connection.
 Interchanging armature and field connection.

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Electrical Machines
Series booster is a

 separately excited DC generator.
 shunt wound DC generator.
 permanent magnet DC generator.
  series wound DC generator.

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Electrical Machines
Which of these types of motor is self starting?

  Single phase induction motor.
  None of these.
  Poly-phase synchronous machine.
  Poly-phase induction motor.

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