Power Systems The surge impedance of a 400 km long overhead transmission line is 420 Ω. For a 200 km length of the same line, the surge impedance will be 210 Ω 400 Ω 420 Ω 840 Ω 210 Ω 400 Ω 420 Ω 840 Ω ANSWER DOWNLOAD EXAMIANS APP
Power Systems A 3-phase transmission line operating at Vs = 400 kV and has ABCD parameters A= D = 0.8∠0°, B = 100∠°90 Ω, C = 0.5*10^-6∠90° ℧. Find Charging current under no load? 0.512∠90° A/phase 0.144∠90° A/phase 1.144∠90° A/phase 0.344∠90° A/phase 0.512∠90° A/phase 0.144∠90° A/phase 1.144∠90° A/phase 0.344∠90° A/phase ANSWER DOWNLOAD EXAMIANS APP
Power Systems Which of the following statements is/are true regarding HVDC? All of these There is no skin effect in dc line Corona loss is very much reduced in the dc line HVDC can utilize earth for its return path All of these There is no skin effect in dc line Corona loss is very much reduced in the dc line HVDC can utilize earth for its return path ANSWER DOWNLOAD EXAMIANS APP
Power Systems The steam power plant efficiency can be improved by using high temperature and high pressure steam. decreasing the load on the plant. burning large amount of coal. using large quantity of water. using high temperature and high pressure steam. decreasing the load on the plant. burning large amount of coal. using large quantity of water. ANSWER DOWNLOAD EXAMIANS APP
Power Systems The inertia constant of 100 MVA, 50 Hz, 4 pole generator is 10 MJ/MVA. If the mechanical input to the machine is suddenly raised from 50 MW to 75 MW, the rotor acceleration will be equal to 225 electrical degrees/s² 12.5 electrical degrees/s² 125 electrical degrees/s² 22.5 electrical degrees/s² 225 electrical degrees/s² 12.5 electrical degrees/s² 125 electrical degrees/s² 22.5 electrical degrees/s² ANSWER DOWNLOAD EXAMIANS APP
Power Systems In a long transmission line, if we increase the length of the line, the parameters A and B respectively decreases and decreases decreases and increases increases and decreases increases and increases decreases and decreases decreases and increases increases and decreases increases and increases ANSWER DOWNLOAD EXAMIANS APP
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