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Electrical Machines

Electrical Machines
Brushes are always placed on--------------- , in order to achieve sparkles commutation?

None of these
 MNA
 GNA
 either GNA or MNA

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

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

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Electrical Machines
Armature reaction in dc motor results

  decrease in speed.
  short circuit.
  increase in speed.
  open circuit.

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Electrical Machines
A shunt generator has a critical field resistance of 300 Ω at a speed of 800 rpm if the speed is raised to 1000 rpm the critical field resistance is

  375 Ω.
 150 Ω.
 145 Ω.
 225 Ω.

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Electrical Machines
If field current is decreased in shunt dc motor, the speed of the motor

None of these
 decreases.
 increases.
 remains same.

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Electrical Machines
Dynamic braking is very effective for

 separately excited motors.
 differential compound motors.
 shunt motors.
 series motors.

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