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Electrical Machines

Electrical Machines
A commutator with a diameter of 50 cm rotating at 1000 rpm. For a brush width of 1.5 cm, find the time of commutation in ms.

 0.443.
 0.649.
 0.512.
  0.573.

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Electrical Machines
A 4 pole dynamo with wave wound armature has 51 slots contains 20 conductors in each slot. If induced emf 357 Volts and speed is 8500 rpm, flux per pole will be

  1.2 mWb.
 1.4 mWb.
 3.5 mWb.
 2.7 mWb.

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Electrical Machines
The field system of an alternator is usually excited

  230 V AC.
  250 / 250 V DC.
  3 - Φ, 50 Hz and 400 V.
  110 / 220 V AC.

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Electrical Machines
If the excitation is critical, the power factor of the alternator is

 unity power factor.
 lagging power factor.
None of these
 leading power factor.

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Electrical Machines
What is the speed of stator rotating magnetic field with respect to rotor rotating magnetic field?

 Slip speed
 Synchronous speed
 Zero
None of these

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Electrical Machines
In a lap winding dc machine number of conductors are 100 and number of parallel paths are 10. Find the average pitch

 10
 100
 1
 50

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