DGVCL EXAM PAPER (11-12-2011) QUIZ

Both the cross-magnetizing mmf and the reactance voltage

The reactance voltage

The cross-magnetizing effect of armature mmf

The demagnetizing effect of armature mmf

Air break CB

Vacuum CB

Bulk Oil CB

Minimum Oil CB

10

15

25

50

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

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

No harmonic problems

Minimum line power losses

Simple protection

Low cost of HVDC terminals

Positive cycle of sine wave

DC

Negative cycle of sine wave

AC

Check the load

Insert a fuse of higher current rating

Reduce the load

Insert a fuse of higher voltage rating

Strain type

Pin type

Suspebsion type

Shakle type

Single line to ground faults

Three phase short ciruits

Phase to phase faults

Double line to ground faults

Less than 90%

More than 90%

90 %

80 %