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Electrical Machines

Electrical Machines
If input of a transformer is square wave the output will be

  pulsed wave.
 sine wave.
 triangular wave.
 square wave.

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Electrical Machines
Wave winding is employed in DC machine of

 high current and low voltage rating.
 low current and low voltage rating.
 high current and low voltage rating.
  low current and high voltage rating.

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Electrical Machines
For a 3 - Φ, 4 pole, 50 Hz IM rotating at full load speed of 1440 rpm, calculate speed of rotor field with respect to rotor structure and stator structure respectively?

 50, 1500.
 1440, 1500.
 60, 1440.
  60, 1500.

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

  both.
  larger output.
  larger bore diameter.
  none.

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Electrical Machines
Which of the following are variable losses?

 eddy current loss
 hysteresis loss
 armature copper loss
 shunt field copper loss

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Electrical Machines
For a 3-phase, 4 pole, 50 Hz synchronous motor the frequency, pole number and the frequency are halved. The motor speed will be

 3000 rpm
 1500 rpm
 75 rpm
 375 rpm

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