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Electrical Machines

Electrical Machines
The slot edges in a DC machine are made of

 Silicon steel.
 Mild steel.
 Cast iron.
  Fibre.

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Electrical Machines
The shaft torque of a dc motor is less than the electromagnetic torque because of

  eddy current losses.
  hysteresis losses.
  ohmic losses.
  mechanical losses.

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Electrical Machines
In shunt dc motor the direction of rotation of the motor will reversed. When

  none of above.
  only field terminals are changed.
  either field terminals are reversed or armature terminals are reversed.
  only armature terminals are reversed.

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Electrical Machines
In a 1-phase induction motor, if the forward torque slip is S, what is the backward torque slip?

 S
 1/S
 1-S
 2-S

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Electrical Machines
The frequency of voltage generated by an alternator having 8 poles and rotating at 250 rpm is

  25 Hz.
  16.67 Hz.
  60 Hz.
  50 Hz.

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Electrical Machines
A DC generator without commutator is a

 AC generator
 DC motor
 DC generator
 induction motor

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MORE MCQ ON Electrical Machines

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