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Electrical Machines

Electrical Machines
The commutator segments of DC machines are made up of

 brass
 copper
 copper alloy
 hard-drawn copper

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Electrical Machines
In a dc machine 6 pole wave winding is used. The number of parallel paths are?

 6
 2
 4
 1

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Electrical Machines
If an additional resistance is connected in series with a DC series motor operating at rated speed, the speed of the motor will

 Remain unaltered.
 Increase.
 Reduce.
 Oscillate around the normal speed.

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Electrical Machines
Which motor used in Lathe machine?

None of these
  D.C. shunt motor.
  D.C . series motor.
  D.C. cumulative compound motor.

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Electrical Machines
For a fault at the terminal of a synchronous generator, the fault current is maximum for a

 3 - phase to ground fault.
 3 - phase fault.
  line to ground fault.
 line to line fault.

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Electrical Machines
Armature resistance control method is used for the _______ ?

None of these
 below rated speed
 above rated speed
 both 1 and 2

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