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

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

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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 reactance voltage
The cross-magnetizing effect of armature mmf

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

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

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DGVCL Exam Paper (11-12-2011)
The motor used in celling fans is

Split phase motor
Universal motor
Capacitor start motor
Capacitor start capacitor run motor

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