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

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

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DGVCL Exam Paper (11-12-2011)
Due to skin effect

Uniform current flows through the conductor
Current flows through the half cross section of the conductor
Portion of the conductor near the surface carries less current and the core of the conductor carries more current
Portion of the conductor near the surface carries more current and the core of the conductor carries less current

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DGVCL Exam Paper (11-12-2011)
A fuse wire should have

High specific resistance and low melting point
Low specific resistance and high melting point
Low specific resistance and low melting point
High specific resistance and high melting point

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

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

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