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Electrical Machines

Electrical Machines
For a dc machine shunt resistance and armature resistance values are

 high and low
 high and high
 low and low
 low and high

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Electrical Machines
Which of the following DC motors has got maximum relieving property?

 Cummulative compound.
 Shunt.
  Series.
 Differentical compound.

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Electrical Machines
In above question, find rms line voltage for delta connection?

 399 V.
 50 V.
  230.2 V.
 100 V.

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

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

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Electrical Machines
Dynamic braking is very effective for

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

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Electrical Machines
Which of the following generators are used in arc welding?

 cumulative compound generators
 series generators
 differential compound generators
 shunt generators

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