Power Systems A 25 MVA, 11 kV alternator is supplying full load at a point of 0.75 lagging. Determine the percentage increase in earning capacity when it is operated at improved power factor of 0.96 lagging. None of above 28 %. 14 %. 56 %. None of above 28 %. 14 %. 56 %. ANSWER DOWNLOAD EXAMIANS APP
Power Systems To protect the power transformer ( Y-Y with neutral grounded) against fault, which type of connection do the current transformers have? Δ-Y connection Y-Y connection Δ-Δ connection Y-Δ connection Δ-Y connection Y-Y connection Δ-Δ connection Y-Δ connection ANSWER DOWNLOAD EXAMIANS APP
Power Systems The load current in short circuit calculations are neglected because both 1 and 2 short circuit currents are greatly out of phase with load currents nether 1 nor 2 short circuit currents are much larger than load currents both 1 and 2 short circuit currents are greatly out of phase with load currents nether 1 nor 2 short circuit currents are much larger than load currents ANSWER DOWNLOAD EXAMIANS APP
Power Systems Power system network has a total power of 5000 MW at 50 Hz supplying to the different consumers. Frequency is varying at 1.5% per change of 2% load. Assume R =0.004 Hz/MW. Find the steady state frequency deviation if a sudden loss of 200 MW occur due to tripping of one of the transmission line? 0.48 Hz -0.52 Hz 50 Hz 0.52 Hz 0.48 Hz -0.52 Hz 50 Hz 0.52 Hz ANSWER DOWNLOAD EXAMIANS APP
Power Systems Bundled conductors in EHV transmission lines increase inductance increase capacitance decrease capacitance decrease inducatance increase inductance increase capacitance decrease capacitance decrease inducatance ANSWER DOWNLOAD EXAMIANS APP
Power Systems Which of the following is/are the disadvantages of phase modifiers? All of these It consumes both active and reactive power It requires more maintenance because of running equipment Initial cost of synchronous phase modifier is higher All of these It consumes both active and reactive power It requires more maintenance because of running equipment Initial cost of synchronous phase modifier is higher ANSWER DOWNLOAD EXAMIANS APP
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