DGVCL Exam Paper (11-12-2011) Reactance relay is used to protect against Phase faults only Both phase and earth faults Earth faults only Over voltage faults Phase faults only Both phase and earth faults Earth faults only Over voltage faults ANSWER DOWNLOAD EXAMIANS APP
DGVCL Exam Paper (11-12-2011) Which type of back up protection is widely used for the protection of transmission lines? Remote backup Control backup Relay backup Breaker backup Remote backup Control backup Relay backup Breaker backup ANSWER DOWNLOAD EXAMIANS APP
DGVCL Exam Paper (11-12-2011) Buchholz relay causes Tripping for both major and minor faults Tripping for minor faults and alarm for major faults Tripping for major faults and alarm for minor faults Alarm for both major and minor faults Tripping for both major and minor faults Tripping for minor faults and alarm for major faults Tripping for major faults and alarm for minor faults Alarm for both major and minor faults ANSWER DOWNLOAD EXAMIANS APP
DGVCL Exam Paper (11-12-2011) Hysteresis in an instrument means The repeatability of the instrument The change in the same reading when the input is first increased and then decreased The inaccuracy due to change in temperature The reliability of the instrument The repeatability of the instrument The change in the same reading when the input is first increased and then decreased The inaccuracy due to change in temperature The reliability of the instrument ANSWER DOWNLOAD EXAMIANS APP
DGVCL Exam Paper (11-12-2011) If a 5 A fuse is blown frequently in a house lighting circuit, it is required to Insert a fuse of higher current rating Check the load Insert a fuse of higher voltage rating Reduce the load Insert a fuse of higher current rating Check the load Insert a fuse of higher voltage rating Reduce the load ANSWER DOWNLOAD EXAMIANS APP
DGVCL Exam Paper (11-12-2011) Due to skin effect 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 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 Uniform current flows through the conductor Current flows through the half cross section of the conductor ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Skin Effect:tendency of the current to crowd near the conductor surface.Skin effect is proportional to frequency, conductor diameter and permiability. Skin effect increases effective resistance of conductor.In DC, no skin effect.
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