If a generator's loading is reduced by 100 MW, what is the new loading for Line A-B and Line C-D if originally Line A-B is at 300 MW and Line C-D at 100 MW with participation factors of 0.4 and 0.2 respectively?

When the generator loading is reduced by 100 MW, the new loading on Lines A-B and C-D must be recalculated based on their participation factors. The participation factors indicate how much each line contributes to the total load.

For Line A-B, the participation factor is 0.4, which means that 40% of any reduction in load will be assigned to this line. Thus, the reduction in load for Line A-B due to the 100 MW reduction is:

0.4 * 100 MW = 40 MW.

Therefore, the new loading for Line A-B will be the original loading minus this reduction:

300 MW - 40 MW = 260 MW.

For Line C-D, with a participation factor of 0.2, the reduction in load it will bear is:

0.2 * 100 MW = 20 MW.

Consequently, the new loading for Line C-D will also be calculated by subtracting this amount from its original loading:

100 MW - 20 MW = 80 MW.

The calculations confirm that after the generator's loading is reduced by 100 MW, Line A-B is at 260 MW and Line C-D is at 80 MW. Thus, the answer matches the given choice