DGVCL Exam Paper (11-12-2011) An IDMT relay provides A definite time cuttent characteristic An inverse time current characteristic 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 characteristic for low values of the failt current and an inverse characteristic for high values of the fault current A definite time cuttent characteristic An inverse time current characteristic 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 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) Which of the following power distribution system gives better reliabity ? Radial system Ring main system None of these DC 3 wire system Radial system Ring main system None of these DC 3 wire system ANSWER DOWNLOAD EXAMIANS APP
DGVCL Exam Paper (11-12-2011) The corona effect can be minimized by increasing The length of the conductor Diameter of the conductor Both spacing between the conductors and diameter of the conductor Spacing between the conductors The length of the conductor Diameter of the conductor Both spacing between the conductors and diameter of the conductor Spacing between the conductors ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Corona can be reduced by using large size of conductor, bundle conductor and hollow conductor.
DGVCL Exam Paper (11-12-2011) An over excited synchronous motor draws current at Lagging power factor Depends on nature of load Leading power factor Unity power factor Lagging power factor Depends on nature of load Leading power factor Unity power factor ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Over excitation : leading currentUnder excitation : lagging currentNormal excitation : current with unity PF (in phase current)
DGVCL Exam Paper (11-12-2011) Ybus used in power flow studies and Zbus used in short circuit studies Are the same Are inverse of each other Have no inter relation Are transpose of each other Are the same Are inverse of each other Have no inter relation Are transpose of each other ANSWER DOWNLOAD EXAMIANS APP
DGVCL Exam Paper (11-12-2011) The purpose of providing a choke in a tube light is To avoid radio interference To improve the power factor To eliminate corona effect To limit the current to an appropriate value To avoid radio interference To improve the power factor To eliminate corona effect To limit the current to an appropriate value ANSWER DOWNLOAD EXAMIANS APP
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