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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
All of these
 BYR
 BRY

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Electrical Machines
A 3-phase, alternator has generated emf per phase of 230 V with 10% 3rd harmonic and 6% 5th harmonic content. Calculate rms line voltage for star connection.

 100 V.
 50 V.
  230.2 V.
 399 V.

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Electrical Machines
In travelling cranes for swing action which motor is preferred?

  DC series motor.
  Capacitor type induction motors.
  AC slip ring IM.
  Reluctance motor.

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Electrical Machines
Which slots are used in the rotor of an induction motor?

  Closed slots.
  None of above.
  Semi closed slots.
  Open slots.

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Electrical Machines
A motor operates in stable region at which of the following slip?

 both 1 and 2
 low slip region
 unity slip
 high slip region

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Electrical Machines
In DC generator, armature reaction refers to what?

 Effect of armature flux on the load.
None of these
 Effect of field flux on the armature flux.
  Effect of armature flux on the main field flux.

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