The digital AIP system can operate off a fully charged battery for up to ______ with a ______ recharge time if the battery is fully ______.

• A. 15 mins; 10 hours; charged
• B. 30 mins; 20 hours; charged
• C. 1 hour; 8 hours; charged
• D. 2 hours; 4 hours; charged

Answer: (B)

This asks you to understand how long the digital AIP system can run on a full battery and how long it takes to recharge to full again. The key idea is the relationship between energy capacity and charging rate: the device can operate for a relatively short period on a full charge, and it requires a noticeably longer time to recharge after use.

The pairing of 30 minutes of operation on a full battery with a 20-hour recharge is the one that fits this pattern. It shows a modest run time while requiring a lengthy recharge, which is typical when charging is limited to protect the battery or when the charging system is slow.

The other options either imply a longer run time with faster recharge or give recharge times that don’t align with the described capability, making them inconsistent with the stated relationship between run time and recharge time.