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Electrical Machines

Electrical Machines
Which of the following induction motor has maximum speed?

  2 pole.
 6 pole.
 8 pole.
 4 pole.

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Electrical Machines
Two mechanically coupled alternators deliver power at 50 Hz and 60 Hz respectively. The highest speed of the alternators is

  3600 rpm.
  600 rpm.
  500 rpm.
  3000 rpm.

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Electrical Machines
As compared to DOL starting, a cage induction motor with star-delta starting shall have

 more starting torque.
 more starting time.
 smoother acceleration.
 reduced starting current.

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Electrical Machines
Armature reaction depends on which of the following?

 power factor of load
 magnitude of load current
None of these
 both 1 and 2

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Electrical Machines
DC Shunt Motor has disadvantage(s) of

 none of above.
 not suitable for rapidly changing loads.
 less expensive.
 constant speed.

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Electrical Machines
In a 3 - φ induction motor running at full load which of these parameters is stationary with respect to the stator mmf wave?

  Stator winding.
  Rotor mmf wave.
  Both rotor and stator winding.
  Rotor winding.

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