DGVCL Exam Paper (11-12-2011)
The transient stability of a power system can be improved by

Excitation control
Single pole switching of circuit breakers
Increasing the turbine valve opening
Phase shifting transformer

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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 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

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