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Question 23 For a single-line-to-ground (SLG) fault, if the positive fault current lai = -14.32 P.U., then the negative-sequence current, la2 is j_P.U. (up to 2 decimal points). Question 24 If the X/R ratio of 8 and the RMS AC fault current for a given fault is 2.543 kA (kilo-Amps), then the RMS "momentary" current at t= 0.5 cycles is _KA (answer up to 3 decimal points) Question 25 The RMS Asymmetrical fault current equals the RMS AC fault current times an "Asymmetry factor K(T)." T/F Question 26 If the X/R ratio of 10 and the RMS AC fault current for a given fault is 2.123 kA (kilo-Amps), then the symmetry factor K(t) at t = 0.5 cycles is (answer up to 3 decimal places). Question 28 The negative sequence diagram of a system is almost identical to the positive sequence diagram except that the voltage sources are absent in negative sequence diagrams. T/F Question 29 Zero sequence currents can always flow within the windings of a Y-connected transformer whether the neutral point is grounded or not. T/F
Question 30 Consider the single-line diagram of a power system as below. Xell. T3 ΔΥ X-0.6 *-*-0.3 G1 -0.08 pu G-X-03 •ಜಿ =x - 6.15 pm X X X T2 X-05 m2 203 AY X-07 Given this system, which of the following represents correct zero sequence impedance diagram of the system? 03 أشقاء es 005 000 19 w 10W 1000 1002 25 0.01 10 C0002 02 03 001 اشها 05 00 1000) . Teos 03 сол J00 Question 31 Zero sequence currents can always flow within the windings of a Y-connected transformer whether the neutral point is grounded or not. T/F