Texas High School ELA Question of the Day
Test your knowledge with a hand-picked multiple-choice question.
From a technical brief on wind turbine maintenance planning: The text argues that apparent power losses at moderate wind speeds are often traceable to airflow separation near the blade root, which accelerates wear on the main bearing. A professional cross-section diagram shows the nacelle, hub, and blade root, with streamlines curving along the airfoil. A shaded region indicates the separation zone under certain attack angles, and an inset magnifies the bearing race where pitting initiates. The analytical caption links the separated flow to cyclical torque spikes registered by the drivetrain and notes that vibration signatures above a given threshold predict bearing damage within two inspection cycles. A sidebar clarifies that the depicted geometry is representative rather than to scale, and that the streamlines illustrate flow regime, not exact velocities.
How do the diagram and its analytical caption function to achieve the author's purpose?