Power Systems Which of the following is/are the desirable properties of a insulator material? High ratio of puncture strength to flash over. High relative permittivity Both 1 and 2 Low ratio of puncture strength to flash over. High ratio of puncture strength to flash over. High relative permittivity Both 1 and 2 Low ratio of puncture strength to flash over. ANSWER DOWNLOAD EXAMIANS APP
Power Systems One million cubic meters of water is stored in a reservoir feeding a water turbine. The density of water is 993 kg/m³. If the centre of mass of water is 50 meters above the turbine and losses are negligible, the energy produced by that volume of water is 130.2 MWhr 135.3 MWhr 120 MWhr 140 MWhr 130.2 MWhr 135.3 MWhr 120 MWhr 140 MWhr ANSWER DOWNLOAD EXAMIANS APP
Power Systems The main objectives of electrical power transmission is/are nether 1 nor 2 both 1 and 2 Voltage regulation of the transmission line must be zero or minimum Transmission system must be more efficient with minimum line losses nether 1 nor 2 both 1 and 2 Voltage regulation of the transmission line must be zero or minimum Transmission system must be more efficient with minimum line losses ANSWER DOWNLOAD EXAMIANS APP
Power Systems A transmission line has a surge impedance of 400 Ω is connected with the cable having surge impedance of 40 Ω, a surge magnitude of 100 kV is travelling from the transmission line towards the cable. Find the incident current? 200 A 100 A 250 A 2500 A 200 A 100 A 250 A 2500 A ANSWER DOWNLOAD EXAMIANS APP
Power Systems In a 220 kV system, the inductance and capacitance up to the circuit breaker location are 25 mH and 0.025 µF respectively. The value of resistor required to be connected across the breaker contacts which will give no transient oscillations, is 25 Ω 1000 Ω 500 Ω 250 Ω 25 Ω 1000 Ω 500 Ω 250 Ω ANSWER DOWNLOAD EXAMIANS APP
Power Systems Earth fault relay uses the which of the following sequence currents? negative sequence any of the above zero sequence positive sequence negative sequence any of the above zero sequence positive sequence ANSWER DOWNLOAD EXAMIANS APP
EXAMIANS