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Electrical Machines

Electrical Machines
The frequency of voltage generated by an alternator having 8 poles and rotating at 250 rpm is

  16.67 Hz.
  25 Hz.
  60 Hz.
  50 Hz.

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Electrical Machines
When two DC series motors are connected in parallel, the resultant speed is

 more than normal speed.
 normal speed.
 less than normal speed.
 zero.

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Electrical Machines
Regenerative braking is not found in which motor?

 DC compound.
  DC series.
 Induction motor.
 DC shunt.

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Electrical Machines
A 4 pole dc generator is running at 1500 rpm the frequency of current in the armature winding is

 150Hz.
 100Hz.
 200Hz.
 50Hz.

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Electrical Machines
Which of the following motor is expensive for same Kw output rates?

 Induction motor.
 AC single phase motor.
 Synchronous motor.
 DC Shunt Motor

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Electrical Machines
To control the speed of an induction motor, the supply frequency is reduced by 10%. For the same magnetizing current to remain constant, the supply voltage must be

 increased by 20%
 reduced by 20%
 increased by 10%
 reduced by 10%

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