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Electrical Machines

Electrical Machines
The slot edges in a DC machine are made of

 Mild steel.
  Fibre.
 Silicon steel.
 Cast iron.

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Electrical Machines
Maximum efficiency will occur, when copper loss is_______to iron loss?

 greater than
 equal to
 any of the above
 less than

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Electrical Machines
If the handle of a three point starter goes to back to OFF position, it may be due to

 all of these.
 zero or very low voltage supply.
 over load.
 high filed circuit resistance.

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

 8
 2
 1
 4

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Electrical Machines
A 250 V DC generator in run at rated speed with no excitation. The open circuit voltage will be

 about 100 V.
  zero.
  250 V.
  very small, say about 2 or 3 V.

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Electrical Machines
Dynamic braking is very effective for

 series motors.
 differential compound motors.
 shunt motors.
 separately excited motors.

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