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Electrical Machines

Electrical Machines
To eliminate 5th harmonic in the induced voltage phase breadth should be

 18°
 72°
 30°
 36°

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Electrical Machines
When a DC cummulative compound wound motor is loaded

 Torque decrease and speed increases.
  Torque increase and speed decrease.
 Torque and speed both increase.
 Both torque and speed decrease.

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Electrical Machines
In a DC Shunt Motor if the load current increases keeping the terminal voltage constant, then flux will

 increase.
 any of the above.
 remain constant.
 decrease.

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Electrical Machines
At what power factor, the voltage regulation of a transformer can be zero ?

  Leading power factor.
 Zero power factor.
 Unity power factor.
 Lagging power factor.

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Electrical Machines
Which of the following motor used in hair dryers?

  Synchronous motors.
  Split phase IM.
  Cage induction motor.
  Shaded pole IM.

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Electrical Machines
A shunt generator is running at 1000 rpm. If flux is reduced by half, then what is the new speed?

 0.
 500.
 2000.
 1000.

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