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Electrical Machines

Electrical Machines
Example of double excited machine is

 DC Shunt Motor
 Synchronous motor.
 Both are correct.
None of these

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

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Electrical Machines
Slot wedges in a dc machine is made up of

 cast iron.
 mild steel.
 fibre.
 silicon steel.

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Electrical Machines
Reluctance and hysteresis motors are the types of which electrical motor?

 Stepper motor.
  1 - Φ synchronous motor.
 3 - Φ induction motor.
 DC motor.

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Electrical Machines
Fifth harmonic component of the induced voltage in three phase AC generator can be eliminated by using a winding pitch of

 5 / 6.
 6 / 7.
  4 / 5.
 2 / 3.

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Electrical Machines
Which of the following machines have highest power factor with respect to magnetizing current?

 Any of the above.
 Open slot type machines.
 Closed slot type machines.
 Semi closed slot type machine.

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