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Electrical Machines

Electrical Machines
For satisfactory performance of 3-phase 480V, 60 Hz induction motor, the supply voltage at 50 Hz should be equal to

 420 V.
 350 V.
 480 V.
 400 V.

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

  larger bore diameter.
  both.
  larger output.
  none.

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Electrical Machines
In above question, find rms line voltage for delta connection?

  230.2 V.
 100 V.
 399 V.
 50 V.

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Electrical Machines
If a shunt generator delivers 100 A at 200 V, and the resistances of the shunt field and armature are 100 ohms and 0.01 ohms respectively, the generator emf will be

  any one of the connection.
  series.
  parallel.
  no resistance is connected.

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Electrical Machines
The primary and secondary windings of a transformer are

  inductively linked.
 mechanically linked.
  conductively linked.
 electrically linked.

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Electrical Machines
If residual magnetism of a shunt generator is destroyed accidentally it may be restored by connecting its shunt field

 to an AC source.
 in reverse.
  to a DC source.
 to earth.

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