DGVCL Exam Paper (11-12-2011) The purpose of interpoles in DC machines is to nullify The demagnetizing effect of armature mmf The reactance voltage The cross-magnetizing effect of armature mmf Both the cross-magnetizing mmf and the reactance voltage The demagnetizing effect of armature mmf The reactance voltage The cross-magnetizing effect of armature mmf Both the cross-magnetizing mmf and the reactance voltage ANSWER EXPLANATION DOWNLOAD EXAMIANS APP interpoles is widely use to improve commutationplace between main poles fitted to yokefunctions:to neutralize armature mmf in commutating zoneto produce some flux in commutating zone
DGVCL Exam Paper (11-12-2011) If the voltage at the two ends of a line are 132 kV, and its reactance is 40 Ω, the stability limit of the line is 435.6 MW 251.5 MW 500 MW 217.8 MW 435.6 MW 251.5 MW 500 MW 217.8 MW ANSWER DOWNLOAD EXAMIANS APP
DGVCL Exam Paper (11-12-2011) An IDMT relay provides An inverse characteristic for low values of the fault current and a definite time characteristic for high values of the fault current A definite time cuttent characteristic An inverse time current characteristic A definite time characteristic for low values of the failt current and an inverse characteristic for high values of the fault current An inverse characteristic for low values of the fault current and a definite time characteristic for high values of the fault current A definite time cuttent characteristic An inverse time current characteristic A definite time characteristic for low values of the failt current and an inverse characteristic for high values of the fault current ANSWER DOWNLOAD EXAMIANS APP
DGVCL Exam Paper (11-12-2011) An AC series circuit has R = 6 Ω, XL = 20 Ω and Xc = 12 Ω. The ciruit power factor will be 0.5 leading 0.6 lagging 0.8 lagging 0.6 leading 0.5 leading 0.6 lagging 0.8 lagging 0.6 leading ANSWER DOWNLOAD EXAMIANS APP
DGVCL Exam Paper (11-12-2011) If the excitation of a synchronous generator fails, it acts as a Synchronous motor Induction generator Induction motor Synchronous generator Synchronous motor Induction generator Induction motor Synchronous generator ANSWER EXPLANATION DOWNLOAD EXAMIANS APP if excitation of synchronous generator fails, operate as induction motor
DGVCL Exam Paper (11-12-2011) The purpose of providing a choke in a tube light is To improve the power factor To avoid radio interference To limit the current to an appropriate value To eliminate corona effect To improve the power factor To avoid radio interference To limit the current to an appropriate value To eliminate corona effect ANSWER DOWNLOAD EXAMIANS APP
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