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Electrical Machines

Electrical Machines
Larger values of air flux density is taken while designing IM for

  larger bore diameter.
  larger output.
  none.
  both.

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Electrical Machines
The speed of a 3-phase induction motor operating in its stable region

 remains constant.
 decreases with increase in the load torque.
 increases with increase in the load torque.
 decreases with decrease in the load torque.

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Electrical Machines
A shaded pole single phase induction motor can be used for

 personal computers as cooling fan
 wet grinders
 food mixers
 tape recorders

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Electrical Machines
Armature flux is.............with respect to main field flux or main field poles?

 rotates same direction
None of these
 rotates opposite direction
 stationary

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Electrical Machines
In which transformer, the tertiary winding is used?

 Delta - delta
 Delta - star
 Star - star
 Star - delta

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

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

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