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Electrical Machines

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

 10 Ω
 50 Ω
 0.1 Ω
 100 Ω

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Electrical Machines
What is the reason for stationary armature essential in alternators above 5 KVA?

 Operating cost is less.
 Insulation requirement is less.
All of these
 Collecting of large current is simple.

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Electrical Machines
The DC compound motors are generally

 Cummulative compound.
 Level Compound.
 Differentical compound.
 None of these.

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

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

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Electrical Machines
What is the function of inter pole in DC generator?

 To get a superior commutation.
  Both option B and C.
 To neutralize the distortion of main field flux due to armature reaction.
 To serve the economical aspects.

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Electrical Machines
The brush-axis of a bipolar dc motor is rotated by 90°. The effect of this rotation on the back emf Eband the torque developed Tdwould be such that

 Eb is zero, but Td is unchanged
 both Eb and Td are zero
 both Eb and Td are unchanged
 Eb is unchanged, but Td is zero

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