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Electrical Machines

Electrical Machines
As compared to an induction motor, the air gap in a DC motor is

 same.
 between 50% and 90%.
 more.
 less than 50%.

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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. Calculate the back emf produced when it is running at a speed of 1500 rpm.

 230 volt.
 240 volt.
 440 volt.
  220 volt.

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Electrical Machines
The magnetic field which initially induces emf in the armature in a self excited DC generator is because of

  residual magnetism.
None of these
 armature reaction.
  permanent magnets.

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

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

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

 Ampere law.
 Fleming's left hand rule.
 Fleming's right hand rule.
 Lenz's law.

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Electrical Machines
The field divertor resistance for a DC series motor is of order of

 100 Ω
 0.1 Ω
 50 Ω
 10 Ω

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