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Electrical Machines

Electrical Machines
In an induction motor, what is the ratio of rotor input to rotor copper loss?

 1-S
 1/S
 1/(1-S)
 S

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Electrical Machines
To achieve spark less commutation brushes of DC generator are rocked ahead so as to bring them

 in magnetic neutral axis.
None of these
 just ahead of magnetic neutral axis.
 just behind the magnetic neutral axis.

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Electrical Machines
In a three phase slip-ring induction motor, brushes are connected to

  3 - Φ AC supply.
  external star-connected resistors.
  DC supply.
  equalizing coils.

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Electrical Machines
For standing a DC motor a starter is required because

  It starts the motor.
  it limits the starting current to a safe value.
  it limits the speed of the motor.
None of these

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Electrical Machines
A DC series motor is running at rated speed without any additional resistance in series. If an additional resistance is placedin series, the speed of motor

 Remains unchanged.
 Increases.
 Oscillates around the rated speed.
  Decreases.

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Electrical Machines
If in DC Shunt Motor the flux is reduced suddenly to zero, then

 the speed of motor will be reduced.
 the motor will attain dangerously high speed.
 the motor will come to stop.
 the armature current will reduce.

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