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Electrical Machines

Electrical Machines
Commutator pitches of duplex and simplex lap windings are respectively

 2 and 1
 4 ang 1
 4 and 2
 2 and 2

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Electrical Machines
The dc motor which can provide zero speed regulation at full load without any controller, is

 shunt.
 series.
 cumulative compound.
 differential compound.

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Electrical Machines
_____________ types of induction motor are widely used.

  Three phase IM.
  Slip ring IM.
  Squirrel cage IM.
  Single phase IM.

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Electrical Machines
The armature shaft must be able to withstand

 bending moment due to weight of the armature.
 any unbalanced magnetic pull on the armature core.
All of these
 twisting strains due to transmission of torque.

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Electrical Machines
When the rotor of a 3 phase induction motor is blocked then the slip is

 0.3.
  0.54.
  1.
 0.7.

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Electrical Machines
A lap wound 4 pole dc motor has 460 conductors. Find the number of parallel paths between the conductors?

 6.
  4.
  2.
  data provided is insufficient.

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