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Electrical Machines

Electrical Machines
The sequence of induction motor is RYB, then the direction of induction motor can be changed by which of the following sequence?

 RBY
 BRY
All of these
 BYR

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Electrical Machines
In synchronous generator a synchronous dead load (lamp, furnaces etc) has no ____________ hence it has no natural frequency of oscillation.

 synchronizing power co efficient.
  restoring torque.
 damping torque.
 mechanical rotatory system.

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

 full load
 half load
 no load
 any of the above

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Electrical Machines
Which of the following motor is suitable for frequent starting and stoppings?

All of these
 Resistance split phase motor
 Capacitor start motor
 Capacitor start capacitor run motor

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

  larger output.
  larger bore diameter.
  both.
  none.

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Electrical Machines
In a dc machine, the demagnetizing effect of armature reaction is due to

 uneven air-gap length
 component of armature mmf along field axis
 magnetic saturation in half of the field pole
 non-sinusoidal nature of armature mmf

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