PrepTest 151

Incorrect. While the lines can handle more electricity before hitting their maximum operating temperature on windy days, there's no indication that utilities force as much electricity as they can through the lines. It might be determined by demand, not capacity.

Incorrect. The stimulus states that wind blowing across lines has a greater cooling effect than winds blowing parallel, so this answer is contradicted by the stimulus.

Correct. Argument or Facts:
Facts

Question Type:
Must Be True

Stimulus Summary:
More electricity equals more heat. At a certain temperature, electrical lines stop working. Wind can cool the line—stronger cools more than weaker; blowing across cools more than blowing parallel.

Answer Anticipation:
There are a lot of potential conclusions that can be drawn from this, comparing the impact of different types of wind on different days. Understanding the basics here and keeping the facts straight is going to be more important than any specific anticipation.

Answer Explanation:
The stimulus states that temperature determines the size of an electrical load that a line can carry, and strong wind cools the lines more than weak wind. Combining these statements, we can infer this answer.

Key Takeaway:
When there are a lot of technical details in a stimulus, focus on how the elements relate to each other, and check back with the stimulus when considering answer choices.

Incorrect. The stimulus doesn't mention air temperature as affecting the electrical load a line can carry; it does mention wind speed. However, just because air temperature is unmentioned doesn't mean we can infer that it's not relevant, or less relevant, than something that is mentioned.

Incorrect. There's no indicator that the maximum operating temperature changes at all. The stimulus states that the line can be cooled to be able to handle larger electrical loads, but that wouldn't increase the maximum temperature; it would just slow down how long it takes to reach it.