DGVCL Exam Paper (11-12-2011)
Ybus used in power flow studies and Zbus used in short circuit studies

Are inverse of each other
Are the same
Have no inter relation
Are transpose of each other

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DGVCL Exam Paper (11-12-2011)
Distribution transformers have good all day efficiency due to

Low copper loss
Low voltage
Low iron loss
Low copper as well as iron loss

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DGVCL Exam Paper (11-12-2011)
DC series motors are best suited for traction work because

Its torque is proportional to the square of the armature current and speed is inversely proportional to torque
Torque and speed are inversely proportional to the square of the armature current
Torque and speed are proportional to the square of the armature current
Its torque is proportional to the square of the armature current and speed is directional proporational to torque

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