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Electrical Machines

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

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

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Electrical Machines
What is the increase in the torque expressed as percentage of initial torque, if current drawn by the dc series motor is increased from 10A to 11A?

 10%
 41%
 21%
 11%

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Electrical Machines
The output power of a dc motor is given by

  none of these.
  EbIa.
  EbIa2.
  EIa.

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Electrical Machines
Equalizer rings are used in which of the followings?

 wave winding
 both 1 and 2
 lap winding
None of these

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

 differential compound generators
 series generators
 shunt generators
 cumulative compound generators

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Electrical Machines
If the applied voltage of a DC motor is 230 V, then back emf, for maximum power developed is

 230 V.
 115 V.
 460 V.
 200 V.

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