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Electrical Machines

Electrical Machines
Flux density under trailing pole tips in case of generator will

 increase
None of these
 either increase or decrease
 decrease

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Electrical Machines
In a DC generator the actual flux distribution depends upon

 size of air gap.
  shape of the pole shoe.
  clearance between tips of the adjacent pole shoes.
  all of above.

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Electrical Machines
If the field winding connection of DC shunt motor is changed

 It will run in same direction.
  It will run in opposite direction.
 motor will become slow.
 motor will not run.

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

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

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Electrical Machines
An unexcited single phase synchronous motor is

 repulsion motor.
 reluctance motor.
  universal motor.
 AC series motor.

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Electrical Machines
In a resistance split phase motor, what is the range of torque angle?

 0°
 70° to 85°
 90°
 25° to 30°

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