Power Systems The line currents of 3-phase supply are: IR = 3 + j 5 A IY =2 + j 2 A IB = -2 - j 1 A The zero sequence current will be 1 + j 4 A 1 + j 2 A -2 - j 1 A 5 + j 7 A 1 + j 4 A 1 + j 2 A -2 - j 1 A 5 + j 7 A ANSWER DOWNLOAD EXAMIANS APP
Power Systems The voltage and current instantaneous values are given as 5 sin (ωt + 30°) pu and 2 sin (ωt - 15°) pu respectively. Find the per unit active power? 7 pu 3.535 pu 5 pu 5.353 pu 7 pu 3.535 pu 5 pu 5.353 pu ANSWER DOWNLOAD EXAMIANS APP
Power Systems A 100 MVA alternator operating at full load at 50 Hz. H = 4 MWsec/MVA, Td = 0.5 sec. One of the transmission line is tripped. So that output of generator is reduced to 70 MW. Find the frequency deviation during this time? -0.56 -0.92 0.56 0.92 -0.56 -0.92 0.56 0.92 ANSWER DOWNLOAD EXAMIANS APP
Power Systems Non-commercial sources of energy are None of these fossil fuel, hydro power and nuclear power. wood, animal wastes and agricultural wastes. solar, wind and biomass. None of these fossil fuel, hydro power and nuclear power. wood, animal wastes and agricultural wastes. solar, wind and biomass. ANSWER DOWNLOAD EXAMIANS APP
Power Systems A string insulator has 4 units. The voltage across the bottom most unit is 33.33% of total voltage. Its string efficiency is 25% 33.33% 75% 66.66% 25% 33.33% 75% 66.66% ANSWER DOWNLOAD EXAMIANS APP
Power Systems The most commonly used material for insulators of overhead lines is PVC glass mica porcelain PVC glass mica porcelain ANSWER DOWNLOAD EXAMIANS APP
EXAMIANS