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Electrical Machines

Electrical Machines
In a transformer which of the following losses are zero?

 Iron loss
All of these
 Copper loss
 Rotational loss

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Electrical Machines
Select the motor that should not be started on no load?

  Series motor.
 Brushless DC motor.
 Compound motor.
 Shunt motor.

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

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

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Electrical Machines
A single-phase transformer has its maximum efficiency at 60 percent of full load. At full load copper loss will be

  more than core loss.
 equal to core loss.
 zero.
 less than core loss.

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Electrical Machines
Which of the following motor used in hair dryers?

  Split phase IM.
  Shaded pole IM.
  Cage induction motor.
  Synchronous motors.

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Electrical Machines
In star-delta starting of squirrel cage induction motor compared to DOL starting the starting current and torque are

 1/√3, 1/3
 1/√3, 1/√3
 1/3, 1/√3
 1/3, 1/3

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