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Electrical Machines

Electrical Machines
The starting resistance of DC motor is generally

 1000 ohms.
  Low.
 around 500 ohms.
 Infinitely large.

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Electrical Machines
If the applied voltage to a dc machine is 230 V, then the back emf, for maximum power developed, is

 200 V
 115 V
 230 V
 460 V

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

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

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Electrical Machines
In case of a compensated DC series motor, the compensating winding is provided

 In parallel with the armature winding.
 As a separate unit.
  In series with the armature winding.
 In parallel with the field winding.

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Electrical Machines
The DC compound motors are generally

 Level Compound.
 Cummulative compound.
 Differentical compound.
 None of these.

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Electrical Machines
In a DC Shunt Motor if the load current increases keeping the terminal voltage constant, then flux will

 any of the above.
 remain constant.
 decrease.
 increase.

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