DGVCL Exam Paper (11-12-2011)
Bulk power transmission over long HVDC lines are preferred on account of

Minimum line power losses
Low cost of HVDC terminals
Simple protection
No harmonic problems

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DGVCL Exam Paper (11-12-2011)
The purpose of interpoles in DC machines is to nullify

Both the cross-magnetizing mmf and the reactance voltage
The cross-magnetizing effect of armature mmf
The demagnetizing effect of armature mmf
The reactance voltage

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

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