Power Systems A three phase, 33 kV oil circuit breaker is rated 1200 A, the symmetrical breaking capacity is 2000 MVA, 3 secs. Then the making capacity is 5200 MVA. 5500 MVA. 5100 MVA. 5000 MVA. 5200 MVA. 5500 MVA. 5100 MVA. 5000 MVA. ANSWER DOWNLOAD EXAMIANS APP
Power Systems What is the function of economiser in steam boilers All of these collect ash particals cooling improving thermal efficiency All of these collect ash particals cooling improving thermal efficiency ANSWER DOWNLOAD EXAMIANS APP
Power Systems In case of failure of prime mover of the generator, which type of relay is used? reverse power relay distance relays impedance relay offset mho relay reverse power relay distance relays impedance relay offset mho relay ANSWER DOWNLOAD EXAMIANS APP
Power Systems The skin effect of conductor will increase when All of these resistivity decrease diameter decrease frequency decrease All of these resistivity decrease diameter decrease frequency decrease ANSWER DOWNLOAD EXAMIANS APP
Power Systems A generator has reactances of sub transient (X")= 0.5 pu, transient (X') = 0.8 pu and synchronous reactance (X) = 5 pu. The voltages at these reactances are 1.2 V, 1.1 V and 1 V respectively. Find the corresponding sub transient fault current in pu? 2.4 pu 3.975 pu 0.2 pu 1.375 pu 2.4 pu 3.975 pu 0.2 pu 1.375 pu ANSWER DOWNLOAD EXAMIANS APP
Power Systems Efficiency of thermal power plant can be taken as turbine efficiency. generator efficiency. efficiency of thermal cycle. product of efficiencies of all stages. turbine efficiency. generator efficiency. efficiency of thermal cycle. product of efficiencies of all stages. ANSWER DOWNLOAD EXAMIANS APP
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