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 100 MVA 500 MVA 400 MVA 125 MVA 100 MVA 500 MVA 400 MVA 125 MVA ANSWER DOWNLOAD EXAMIANS APP
Power Systems What will be the ratio of the C.T. on the H.V side of a 3 - φ star / delta 33 / 11 kV transformer if the protecting CT on the LV side has a ratio of 300 : 5 ? 150 : 4 / √3. 100 : 5 / √3. 120 : 6 / √3. 200 : 5 / √3. 150 : 4 / √3. 100 : 5 / √3. 120 : 6 / √3. 200 : 5 / √3. ANSWER DOWNLOAD EXAMIANS APP
Power Systems For a 500 Hz frequency excitation, a 100 km long power line will be modelled as any of the above long transmission line shunt capacitor medium transmission line any of the above long transmission line shunt capacitor medium transmission line ANSWER DOWNLOAD EXAMIANS APP
Power Systems The neutral of 10 MVA, 11 kV alternator is earthed through a resistance of 5 ohms. The fault ready is set to operate at 0.75 A. The current transformers have a ratio of 1000/5. What is the percentage of the alternator winding is protected? 85% 15% 88.2% 11.8% 85% 15% 88.2% 11.8% ANSWER DOWNLOAD EXAMIANS APP
Power Systems A 3-phase, 110 kV coaxial XLPE insulated power cable delivering power at 50 Hz, has a capacitance of 125 nF/km. If the dielectric loss tangent of XLPE is 2*10^-4, then dielcetric power loss in this cable in W/km/phase is 35.45 31.7 38.6 23.9 35.45 31.7 38.6 23.9 ANSWER DOWNLOAD EXAMIANS APP
Power Systems The main objectives of power system is/are Flexible power has to be available. All of these Reliable power has to be available Cost of electrical energy per KWh is to be minimum Flexible power has to be available. All of these Reliable power has to be available Cost of electrical energy per KWh is to be minimum ANSWER DOWNLOAD EXAMIANS APP
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