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Electrical Machines

Electrical Machines
The sequence of induction motor is RYB, then the direction of induction motor can be changed by which of the following sequence?

All of these
 RBY
 BYR
 BRY

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Electrical Machines
Find the developed torque DC Series Motor having armature resistance of 0.2 Ω and taking armature current of 60 A is connected to 250 V supply. Considered brush drop of 1 V each.

 cant be determined.
 266.20 N-m.
 133.22 N-m
 234.76 N-m.

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Electrical Machines
The teeth in the armature of a DC machines are sometimes skewed. This is done to reduce

 vibrations.
 hysteresis loss.
 eddy electric current loss.
 copper loss.

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Electrical Machines
In DC generator, full form of MNA is what?

  Magnetic neutral axis.
 Magnetic neutral armature co-ordinate.
 Magnetically no-load armature co-ordinate.
 Magnetic no-load axis.

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Electrical Machines
If the field connection of a DC Shunt Motor is changed then

 it will run in same direction by slowly.
 motor will not run.
 it will run in same direction.
 it will run in opposite direction.

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Electrical Machines
A flat compound generator is obtained from compound generator by connecting a variable resistor

 in parallel with the series field
 in series with the series field
 in series with the shunt field
 in parallel with the shunt field

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