Power Systems Pump storage schemes are used to improve the power factor. the load factor. the plant capacity factor as well as the load factor of the power system. the diversity factor. the power factor. the load factor. the plant capacity factor as well as the load factor of the power system. the diversity factor. ANSWER DOWNLOAD EXAMIANS APP
Power Systems Which of the following is/are the desirable properties of a insulator material? High ratio of puncture strength to flash over. Low ratio of puncture strength to flash over. Both 1 and 2 High relative permittivity High ratio of puncture strength to flash over. Low ratio of puncture strength to flash over. Both 1 and 2 High relative permittivity ANSWER DOWNLOAD EXAMIANS APP
Power Systems If power P available from a hydroelectric plant is given by the formula P = 9.81QH, where Q is the flow rate through the turbine in l / s and H is the head in meters, then P will be unit of HP. kWh. W. kJ / S. HP. kWh. W. kJ / S. 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? 15% 85% 88.2% 11.8% 15% 85% 88.2% 11.8% 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? 0.92 -0.56 0.56 -0.92 0.92 -0.56 0.56 -0.92 ANSWER DOWNLOAD EXAMIANS APP
Power Systems Which of the following relationships are not valid for short transmission lines A = D = 1 All of these Is = Ir B = C = Z A = D = 1 All of these Is = Ir B = C = Z ANSWER DOWNLOAD EXAMIANS APP
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