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Electrical Machines

Electrical Machines
The emf induced in a conductor rotating in a bipolar field is

 AC.
None of these
 both of above.
 DC.

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Electrical Machines
Total core loss is also called as -------------?

 Copper loss
 Eddy current loss
 Magnetic loss
 Hysteresis loss

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Electrical Machines
A separately-excited dc motor has an armature resistance of 0.5 Ω. It runs off a 250 V dc supply Drawing an armature current of 20 A at 1500 rpm. The torque developed for an armature current Of 10 A, for the same field current, will be

 15.92 Nm
 15.28 Nm
 16.55 Nm
 15.6 Nm

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

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

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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 ______________.

  8.
 6.
  2.
 4.

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Electrical Machines
In most condition which frame of motor will be preferred?

 Drip proof.
  Totally enclosed fan coiled.
 Splash proof.
 Open type.

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