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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.

 0.512.
 0.649.
 0.443.
  0.573.

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Electrical Machines
The direction of rotation of a DC motor can be determent by

 Amperes law.
  Flemings left hand rule.
 Flemings right hand rule.
 Lenzs law.

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Electrical Machines
A 4 pole wave wound dc motor having flux per pole of 9.56 X 10-3 Wb contains 460 armature conductors with armature resistance of 0.6 ohm. Calculate the starting current flowing through the armature if the supply voltage is 240 volt.

  0.5 Amp.
  400 Amp.
 320 Amp.
 800 Amp.

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Electrical Machines
From no load to full load the slip will

 not change.
None of these
 slightly increase.
 slightly decrease.

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Electrical Machines
Flux density under trailing pole tips in case of generator will

 increase
 either increase or decrease
None of these
 decrease

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Electrical Machines
In a synchronous motor electromagnetic power varies

 inversely as applied voltage
 directly as applied voltage
 directly as square of applied voltage
None of these

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