Power Systems A string insulator has 4 units. The voltage across bottom most unit is 10 kV and its efficiency is 90%. Find the total operating phase voltage? 40 kV 32 kV 45 kV 36 kV 40 kV 32 kV 45 kV 36 kV ANSWER DOWNLOAD EXAMIANS APP
Power Systems A 60 Hz, 320 Km loss less line has sending end voltage 1.0 pu. The receiving end voltage on no-load is 1.1 pu. 1.116 pu. 1.088 pu. none of these. 1.1 pu. 1.116 pu. 1.088 pu. none of these. ANSWER DOWNLOAD EXAMIANS APP
Power Systems A 1-phase transmission line has an impedance (3+4j) Ω . Find the power factor of the load for achieving maximum and zero voltage regulation? 0.8 lag and 0.6 lead 0.6 lag and 0.6 lead 0.8 lag and 0.8 lead 0.6 lag and 0.8 lead 0.8 lag and 0.6 lead 0.6 lag and 0.6 lead 0.8 lag and 0.8 lead 0.6 lag and 0.8 lead ANSWER DOWNLOAD EXAMIANS APP
Power Systems The use of high speed circuit breakers decrease system stability. increased the short circuit current. improves system stability. reduces the short circuit current. decrease system stability. increased the short circuit current. improves system stability. reduces the short circuit current. ANSWER DOWNLOAD EXAMIANS APP
Power Systems Differential relays does not used for which of the following faults? faults within a transformer both 1 and 2 faults within a generator through faults faults within a transformer both 1 and 2 faults within a generator through faults ANSWER DOWNLOAD EXAMIANS APP
Power Systems If, for a given alternator in economic operation mode, the incremental cost is given by (0.012 P + 8) Rs/MWh, dPL/dP = 0.2 and plant λ = 25, then power generation is 1500 MW 750 MW 1000 MW 1250 MW 1500 MW 750 MW 1000 MW 1250 MW ANSWER DOWNLOAD EXAMIANS APP
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