8.(10 points total) True/False - 1 points each. Circle T if statement is true, F

Question

8.(10 points total) True/False - 1 points each. Circle T if statement is true, F if statement is False. 1.Supplying reactive power locally leads to increased line current, thus increased line losses T F 2.Excepting a few small isolated systems, the electric grid in North America consists of a single large synchronous 60 Hz systenm With balanced three-phase circuits, per-phase analysis is commonly done after converting the Y-connected loads to ?-connected loads, thereby solving only one phase of the circuit. TF4.The area control error (ACE) for an electric balancing authority can never be negative because transmission lines always have real power losses 5.Nonlinear equations, such as those for the power flow, can have multiple solutions T F 6.For a large power system model the vast majority of the entries in the Bus Admittance Matrix (Ybus) will be zero 7.The magnetic ield generated by a transmission line is primarily dependent upon the line's operating voltage and essentially independent of the line current Transformer cores are laminated to reduce eddy current losses For live line maintenance, using a helicopter a human could be placed on an energized 345 kV line 10. To model a line-to-line fault on an otherwise balanced system the zero sequence network is connected in series with the positive sequence network.

Explanation / Answer

1.supplying reactive power leads to decrease the line current [FALSE]

2.

3.per phase analysis is possible only by using star connected loads not delta connected loads.[FALSE]

4.

5. non linear equations having multiple solutions [TRUE]

6.[TRUE]

7. The magnetic field generation depends on line current not line voltage [FALSE]

8.[TRUE]

9.[TRUE]

10.[TRUE]

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