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Electrical Machines

Electrical Machines
The power flow of a dc motor, with respect to a DC generator is

  increased.
  reversed.
  none of these.
  modified.

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Electrical Machines
In a dc machine 4 pole lap winding is used. The number of parallel paths are?

 4
 1
 2
 8

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Electrical Machines
For higher values of armature, the speed of a DC series motor is

 Proportional to armature current.
  Constant.
 Inversely proportional to armature current.
 Proportional to the square of armature current.

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Electrical Machines
Addition of 0.3 % to 4.5 % silicon to iron

None of these
  reduces the saturation magnetization.
  increases the hysteresis loss.
  increases the electrical resistivity of iron.

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Electrical Machines
What is/are the necessary conditions for parallel operation of alternators?

 Frequency should be same
 Terminal voltage is same
 Speed of alternators should be same
 Both 1and 2

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Electrical Machines
Direct-on-line (DOL) starters are not suitable for starting large DC motors, because

 the motor may not start.
 the starting current will be enormously high.
 the starting torque becomes low.
 the motor may run away.

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