DGVCL Exam Paper (11-12-2011) The insulation coordination for UHV lines (above 500 kV) is done based on Switching surges Lightning surges Lightning and switching surges Voltage level of the line Switching surges Lightning surges Lightning and switching surges Voltage level of the line ANSWER DOWNLOAD EXAMIANS APP
DGVCL Exam Paper (11-12-2011) A device connected to the computer which converts digital signals to analog and vice-versa is CPU Modem Keyboard UPS CPU Modem Keyboard UPS ANSWER DOWNLOAD EXAMIANS APP
DGVCL Exam Paper (11-12-2011) In a series RLC circuit at resonance Current is maximum and power factor is unity Current is maximum and power factor is 0.5 Current is minimum and power factor is 0.5 Current is minimum and power factor is unity Current is maximum and power factor is unity Current is maximum and power factor is 0.5 Current is minimum and power factor is 0.5 Current is minimum and power factor is unity ANSWER DOWNLOAD EXAMIANS APP
DGVCL Exam Paper (11-12-2011) The efficiency of a transformer at full load, 0.8 p.f. lag is 90%. Its efficiency at full load, 0.8 p.f. lead will be More than 90% 90 % Less than 90% 80 % More than 90% 90 % Less than 90% 80 % ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Efficiency= output power/input powerefficiency = (v*i*cosφ)/((v*i*cosφ)+(x² Pc)+(Pi)) x=fractional part of full load
DGVCL Exam Paper (11-12-2011) Which lightning stroke is most dangerous? Direct stoke on tower top Indirect stroke on conductor Direct stroke on line conductor Direct stroke on ground wire Direct stoke on tower top Indirect stroke on conductor Direct stroke on line conductor Direct stroke on ground wire ANSWER DOWNLOAD EXAMIANS APP
DGVCL Exam Paper (11-12-2011) The mutual inductance between two unity coupled coils of 9 H and 4 H is 13 H 2.2 H 6 H 36 H 13 H 2.2 H 6 H 36 H ANSWER DOWNLOAD EXAMIANS APP
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