Power Systems Mho relay is used for protection of medium lines. none of these. long lines. short lines. medium lines. none of these. long lines. short lines. ANSWER DOWNLOAD EXAMIANS APP
Power Systems Two insulator discs of identical capacitance value C make up a string for a 22 kV, 50 Hz, single phase overhead line insulation system. If pin to earth capacitance is also C, then find the string efficiency? 86%% 90% 50% 75% 86%% 90% 50% 75% ANSWER DOWNLOAD EXAMIANS APP
Power Systems Which of the following power plants can generate power at unpredictable or uncontrollable time Wind turbine. Cooling tower. Pulverising unit. Condenser. Wind turbine. Cooling tower. Pulverising unit. Condenser. ANSWER DOWNLOAD EXAMIANS APP
Power Systems A 200 MVA alternator operated at no load at frequency of 50 Hz, it has inertia constant of 5 MWsec/MVA and governing system has a time delay of 0.6 sec. If the load of 50 MW is suddenly applied then find the frequency deviation during this time? 0.85 Hz 0.76 Hz -0.85 Hz -0.76 Hz 0.85 Hz 0.76 Hz -0.85 Hz -0.76 Hz ANSWER DOWNLOAD EXAMIANS APP
Power Systems A guard ring is used in string type insulator having 3 units to improve string efficiency. Find the capacitance of metal link 2 if pin to earth capacitance of each unit is 1 F? 2 F 1 F 4 F 0.5 F 2 F 1 F 4 F 0.5 F ANSWER DOWNLOAD EXAMIANS APP
Power Systems Which of the following contributes to the Rankine cycle efficiency improvement in a thermal power plant Use of high pressure. All of these Reheat of steam an intermediate stages. Use of steam for heating of boiler feed water. Use of high pressure. All of these Reheat of steam an intermediate stages. Use of steam for heating of boiler feed water. ANSWER DOWNLOAD EXAMIANS APP
EXAMIANS