How far are purchase tapes rotated before entering the sheaves of the LWFB?

The correct answer indicates that the purchase tapes are rotated 90 degrees before they enter the sheaves of the Low Water Fuel Bin (LWFB). This rotation is crucial because it allows the tapes to properly align with the sheaves, ensuring that the load is efficiently transferred and that the system functions effectively. Proper alignment is essential for the smooth operation of machinery, minimizing wear and tear on components and helping maintain safety standards in the electrical power production environment.

Other options represent different angles of rotation that would not allow the purchase tapes to interface correctly with the sheaves. For example, a 180-degree rotation would misalign the tapes, leading to potential issues with load transfer and machinery operation, while 45 degrees would not provide sufficient alignment for proper functionality. A full 360-degree rotation would also be unnecessary and inefficient, as it would bring the tapes back to their original orientation without serving any practical purpose. Therefore, a 90-degree turn is optimal for achieving the intended operational efficiency and performance.