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Electrical Machines

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

 full load
 any of the above
 half load
 no load

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Electrical Machines
In case of a compensated DC series motor, the compensating winding is provided

  In series with the armature winding.
 As a separate unit.
 In parallel with the field winding.
 In parallel with the armature winding.

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Electrical Machines
Open circuit in a transformer is prefered with

 rated transformer current
 high frequency supply
 direct current
 rated transformer voltage

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Electrical Machines
The power flow of a dc motor, with respect to a DC generator is

  increased.
  none of these.
  modified.
  reversed.

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Electrical Machines
If any two leads from slip rings are interchanged in a 3 - Φ induction motor, the motor will

  run in a direction opposite to previous one.
  continue running in the same direction as before.
  not run.
  get damaged.

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Electrical Machines
The squirrel cage induction motors are provided with blades in order to

  facilitate cooling of rotor.
  balance the rotor dynamically.
  eliminate noise.
  none of these.

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