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Electrical Machines

Electrical Machines
In which transformer, the tertiary winding is used?

 Star - star
 Delta - star
 Delta - delta
 Star - delta

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Electrical Machines
In a transformer, hysteresis and eddy current losses depend upon

 supply frequency
 load current
 both 2 and 3
 maximum flux density

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Electrical Machines
A triangular mmf wave is produced in the air gap of an electric machine. Such wave is produced by

 rotor of a dc machine.
 stator of a dc machine.
 stator of a induction machine.
 rotor of an synchronous machine.

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Electrical Machines
Sparkless commutation can be achieved by employing

 compensating winding.
  inter poles.
  any one or more of the above methods.
  high resistance carbon brushes.

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Electrical Machines
A 3-phase, 2 pole, 12 slot synchronous machine is operating at synchronous speed. Find the slot angle?

 20°
 18°
 60°
 30°

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Electrical Machines
A 3- phase synchronous motor can operate over a wide range of power factors i.e. from lagging to leading power factor. This is achieved by

 varying the applied voltage.
 changing the field excitation.
 changing the load.
 varying the speed.

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