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? 75% 86%% 50% 90% 75% 86%% 50% 90% ANSWER DOWNLOAD EXAMIANS APP
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 Where the voltage is high and current to be interrupted is low, Which of following the breaker is preferable? Any of these. Air blast CB. Oil CB. Vacuum CB. Any of these. Air blast CB. Oil CB. Vacuum CB. ANSWER DOWNLOAD EXAMIANS APP
Power Systems For flat voltage profile system, voltage regulation is 0% 100% any of the above 50% 0% 100% any of the above 50% ANSWER DOWNLOAD EXAMIANS APP
Power Systems The power output from an hydroelectric plants depend on type of turbine, type of dam and type of catchment area. discharge, system efficiency. type of dam, head, system efficiency. type of dam, type of catchment area and discharge. type of turbine, type of dam and type of catchment area. discharge, system efficiency. type of dam, head, system efficiency. type of dam, type of catchment area and discharge. ANSWER DOWNLOAD EXAMIANS APP
Power Systems A transmission line has self and mutual impedances of 0.8 pu and 0.2 pu. Find the positive, negative and zero sequence impedances respectively? 0.6, 0.6 and 1.2 pu 0.8, 0.8 and 1.2 pu 0.8, 0.6 and 1.2 pu 0.6, 0.8 and 1.2 pu 0.6, 0.6 and 1.2 pu 0.8, 0.8 and 1.2 pu 0.8, 0.6 and 1.2 pu 0.6, 0.8 and 1.2 pu ANSWER DOWNLOAD EXAMIANS APP
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