Power Systems Lightning arresters are used to protect electrical equipment against power frequency of over voltages. over currents due to lightning stroke. over voltages due to indirect lightning stroke. direct strokes of lightning. power frequency of over voltages. over currents due to lightning stroke. over voltages due to indirect lightning stroke. direct strokes of lightning. ANSWER DOWNLOAD EXAMIANS APP
Power Systems A 200 MVA alternator operated at no load at frequency of 50 Hz, it has inertia constant of 5 MWsec/MVA and governing system has a time delay of 0.6 sec. If the load of 50 MW is suddenly applied then find the frequency deviation during this time? 0.85 Hz 0.76 Hz -0.76 Hz -0.85 Hz 0.85 Hz 0.76 Hz -0.76 Hz -0.85 Hz ANSWER DOWNLOAD EXAMIANS APP
Power Systems Mho relay is usually employed for protection of any line long transmission lines only short transmission lines only medium transmission lines only any line long transmission lines only short transmission lines only medium transmission lines only ANSWER DOWNLOAD EXAMIANS APP
Power Systems Which of the following is/are the effects of corona All of these power loss decreases interference decreases charging current increases All of these power loss decreases interference decreases charging current increases ANSWER DOWNLOAD EXAMIANS APP
Power Systems Demand factor of a plant is 0 greater than 1 1 less than 1 0 greater than 1 1 less than 1 ANSWER DOWNLOAD EXAMIANS APP
Power Systems Which of the following decides the insulation level of 400 kV, EHV line? switching over voltage skin effect radio interference lighting voltage switching over voltage skin effect radio interference lighting voltage ANSWER DOWNLOAD EXAMIANS APP
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