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Electrical Machines

Electrical Machines
The current drawn by a DC motor at the time of starting is

 Zero.
 Very low.
 Normal.
 Very high.

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Electrical Machines
R1 is the resistance of the primary winding of the transformer. The turn ratio in terms of primary to secondary is K. Then the equivalent resistance of the primary referred to secondary is

 K²R1
 K×R1
 R1 /K²
 R1 /K

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Electrical Machines
Iron losses in a DC machine are independent of variation in

  speed and voltage.
 speed.
  voltage.
  load.

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Electrical Machines
Silicon content in steel lamination is kept within 5% as it

 increases hysteresis loss.
 Increases cost.
 makes the material brittle.
All of these

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Electrical Machines
A synchronous motor is supplying a load at unity power factor. If the load on the motor is increased keeping its excitation and terminal voltage constant, the power factor

 will become leading
 will remain the same
None of these
 will become lagging

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Electrical Machines
The wattage rating of a ceiling fan motor will be

 250 - 500 W.
 10 - 20 W.
  50 - 150 W.
 200 - 250 W.

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