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Electrical Machines

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

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

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Electrical Machines
Which of following motor is preferred for belt conveyor?

  Reluctance motor.
  Synchronous motors.
  Universal motor.
  Slip ring induction motor.

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Electrical Machines
A 100/10, 50 VA double winding transformer is converted to 100/110 V auto transformer. The rating of auto transformer is

 500 VA
 550 VA
 100 VA
 110 VA

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Electrical Machines
A 3 - Φ, 6 pole, 50 Hz IM is running at a full load speed of 980 rpm. If it delivers an air gap power of 98000 Watt, calculate the rotor ohmic loss?

  980 Watt.
 1920 Watt.
 1800 Watt.
  1960 Watt.

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Electrical Machines
Use of fractional pitch winding

  make it stiffer.
All of these
  results in reduced axial length of the machine.
  results in reduced leakage reactance.

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Electrical Machines
Total core loss is also called as -------------?

 Copper loss
 Magnetic loss
 Eddy current loss
 Hysteresis loss

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