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Electrical Machines

Electrical Machines
Eb/Vt ratio of a DC motor is an indication of

 running torque.
 speed regulation.
 efficiency.
 starting torque.

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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 ______________.

  8.
  2.
 4.
 6.

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Electrical Machines
The speed of a cumulatively compound DC motor can be controlled by varying

 Armature voltage control.
 Any of above.
 Shunt field resistance control.
 Armature resistance control.

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Electrical Machines
Addition of 0.3 % to 4.5 % silicon to iron

  reduces the saturation magnetization.
  increases the hysteresis loss.
None of these
  increases the electrical resistivity of iron.

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Electrical Machines
A crusher is equipped with

 Slip ring induction motor.
 Reluctance motor.
 DC shunt motor.
 Synchronous motor.

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Electrical Machines
Armature resistance control method is used for the _______ ?

 above rated speed
 both 1 and 2
 below rated speed
None of these

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