In general, when the sector angle is decreased, the number of scan lines is ______.

• A. Increased
• B. Reduced
• C. Unchanged
• D. Doubled

Answer: (B)

The number of scan lines is tied to how widely you sample angles within the sector. When you decrease the sector angle but keep the same angular spacing between lines, there are fewer angles to sample, so the total number of scan lines decreases. If the sector angle is reduced, you’d typically end up with fewer lines, since each line represents a distinct angle within that sector. This is why reducing the sector angle leads to a reduced number of scan lines. The other options don’t fit because increasing would mean more lines for a smaller angle, which isn’t how the sampling is set up; keeping it unchanged ignores the narrower angular span; and doubling would require more lines than the smaller sector provides.