Power Systems a 50 Hz, 3-phase synchronous generator has inductance per phase of 15 mH. The capacitance of the generator and circuit breaker is 0.002 µF. What is its natural frequency? 29 MHz 2.9 kHz 29 kHz 290 kHz 29 MHz 2.9 kHz 29 kHz 290 kHz ANSWER DOWNLOAD EXAMIANS APP
Power Systems When bundle conductor are used in place of single conductor the effective inductance and capacitance will respectively decrease and remain unaffected. decrease and increase. increase and remain unaffected. increase and decrease. decrease and remain unaffected. decrease and increase. increase and remain unaffected. increase and decrease. ANSWER DOWNLOAD EXAMIANS APP
Power Systems The incremental fuel costs for two generating units G1 and G2 are given by Ic1 = 25 + 0.2 PG1 and Ic2 = 32 + 0.2 PG2, where PG1 and PG2 are real powers generated by the units. The economic allocation for a total load of 250 MW, neglecting transmission loss, is given by PG1 = 109.75 MW and PG2 = 140.25 MW PG1 = 100 MW and PG2 = 150 MW PG1 = 142.5 MW and PG2 = 107.5 MW PG1 = 125 MW and PG2 = 125 MW PG1 = 109.75 MW and PG2 = 140.25 MW PG1 = 100 MW and PG2 = 150 MW PG1 = 142.5 MW and PG2 = 107.5 MW PG1 = 125 MW and PG2 = 125 MW ANSWER DOWNLOAD EXAMIANS APP
Power Systems A 10 MVA generator has reactance of 0.2 pu. Find the new reactance value for 50 MVA base? 0.2 pu 5 pu 0.25 pu 1 pu 0.2 pu 5 pu 0.25 pu 1 pu ANSWER DOWNLOAD EXAMIANS APP
Power Systems The specific speed ( NS ) of turbine is given by none of these. N√( P ) / H1.25. N√( P ) / H2/3. P√( N ) / H3/2. none of these. N√( P ) / H1.25. N√( P ) / H2/3. P√( N ) / H3/2. ANSWER DOWNLOAD EXAMIANS APP
Power Systems Maximum efficiency of modern coal fired steam raising thermal power plants is restricted to about 035 (a low value), mainly because of high energy loss from turbine exhaust to condenser. low alternative efficiency. low steam turbine mechanical efficiency. high energy loss in boiler. high energy loss from turbine exhaust to condenser. low alternative efficiency. low steam turbine mechanical efficiency. high energy loss in boiler. ANSWER DOWNLOAD EXAMIANS APP
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