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Electrical Machines

Electrical Machines
A 220 V DC generator is run at full speed without any excitation. The open circuit voltage will be

  220 V.
  about 50 V.
  zero.
  about 2 V.

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Electrical Machines
A 3 stack stepper motor has 12 teeth on stator as well as on rotor. Determine the step size when each stack excited?

 45°.
  10°.
 24°.
 30°.

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

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

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Electrical Machines
How can the synchronous speed of a 3 - Φ IM be varied?

  By varying supply voltage.
  By varying number of poles.
  By varying the supply frequency.
  Both (A) and (B).

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Electrical Machines
The speed of a 50 Hz three phase induction motor under full load condition is 725 rpm the number of poles of the motor are ______________.

  2.
  8.
 4.
 6.

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Electrical Machines
The brushes of a DC machine should be placed on the

 commutator in the polar axis.
 armature midway between poles.
 commutator in the inter polar axis.
 armature in the polar axis.

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