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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.

 0.649.
  0.573.
 0.443.
 0.512.

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Electrical Machines
What is the emf generated by a 4 pole Lap connected DC Motor rotating at 1500 rpm having 1000 conductors and useful flux per pole is 0.4 mWb.

 40 volts.
 20 volts.
 30 volts.
 10 volts.

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Electrical Machines
R1 is the resistance of the primary winding of the transformer. The turn ratio in terms of primary to secondary is K. Then the equivalent resistance of the primary referred to secondary is

 K²R1
 R1 /K
 R1 /K²
 K×R1

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Electrical Machines
A 230 V dc series generator is driven at its rated speed. The no-load voltage across its armature terminals would be

 6 V
 somewhat less than 230 V
 somewhat more than 230 V
 230 V

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Electrical Machines
In a DC generator, the ripples in the direct emf generated are reduced by employing

  commutator with large number of segments.
 graphite brushes.
  carbon brushes.
  equalizer rings.

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Electrical Machines
The ___________________ generator has the poorest voltage regulation.

  differential compounded.
  over compounded.
  under-compounded.
  shunt.

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