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Electrical Machines

Electrical Machines
Normally for the design of transformer the ambient temperature is taken as

 32°C.
 27°C.
  45°C.
 35°C.

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Electrical Machines
Which of the following motor is more expensive for same KW output rating ?

 DC Shunt Motor
 AC single phase motor.
 Induction motor.
 Synchronous motor.

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Electrical Machines
An IM cannot run at synchronous speed because

  induction motor will become synchronous motor.
  none of above.
  rotor torque will not be produced.
  air friction will prevent it.

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Electrical Machines
Thin laminations are used in a machine in order to reduce

 Copper losses
 Both 1 and 2
 Eddy current losses
 Hysteresis losses

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Electrical Machines
To eliminate the 5th harmonic in the induced voltages their respective pitch factor angle should be

 36°
 18°
 30°
 72°

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Electrical Machines
The flux involved in the emf equation of a transformer has

 total value.
 rms value.
  maximum value.
 average value.

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