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Electrical Machines

Electrical Machines
If direct axis reactance Xd and quadrature axis reactance Xq are equal, then reluctance power is

 maximum
 minimum
 zero
All of these

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Electrical Machines
Swinburne test is conducted under which of the following condition?

 half load
 no load
 any of the above
 full load

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

 tape recorders
 wet grinders
 food mixers
 personal computers as cooling fan

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Electrical Machines
A DC compound motor has

 tertiary winding.
 both shunt and series field winding.
 only shunt field winding.
 only series field winding.

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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 travelling cranes for crane travel, trolley and boom hoist which motor is preferred?

  Slip ring induction motor.
  Stepper motor.
  Synchronous motor.
  DC differential compound motor.

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