Power Systems Four identical alternators each are rated for 20 MVA, 11 KV having a subtransient reactance of 16% are working in parallel. The short circuit level at the busbar is 400 MVA 500 MVA 100 MVA 125 MVA 400 MVA 500 MVA 100 MVA 125 MVA ANSWER DOWNLOAD EXAMIANS APP
Power Systems A transmission line has 50 km operating at frequency of 500 Hz. Find the type of the line? long transmission line any of the above medium transmission line short transmission line long transmission line any of the above medium transmission line short transmission line ANSWER DOWNLOAD EXAMIANS APP
Power Systems A cable has inductance of 0.22 mH per km and capacitance of 0.202 µF per km. The surge impedance of the cable is 40 Ω 52 Ω 33 Ω 28 Ω 40 Ω 52 Ω 33 Ω 28 Ω ANSWER DOWNLOAD EXAMIANS APP
Power Systems The specific speed ( NS ) of turbine is given by N√( P ) / H2/3. N√( P ) / H1.25. P√( N ) / H3/2. none of these. N√( P ) / H2/3. N√( P ) / H1.25. P√( N ) / H3/2. none of these. ANSWER DOWNLOAD EXAMIANS APP
Power Systems A transmission line has surge impedance of 400 Ω, operating at Vs = Vr = 400 kV line is compensated with a shunt capacitance of 30%. The line is connected to a generator delivering 200 MW. Find the load angle with out and with compensation respectively? 45° and 26° 26° and 30° 30° and 45° 30° and 26° 45° and 26° 26° and 30° 30° and 45° 30° and 26° ANSWER DOWNLOAD EXAMIANS APP
Power Systems Maximum efficiency of modern coal fired steam raising thermal power plants is restricted to about 035 (a low value), mainly because of high energy loss in boiler. high energy loss from turbine exhaust to condenser. low alternative efficiency. low steam turbine mechanical efficiency. high energy loss in boiler. high energy loss from turbine exhaust to condenser. low alternative efficiency. low steam turbine mechanical efficiency. ANSWER DOWNLOAD EXAMIANS APP
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