Which description best captures the redundancy feature of the transmission lubrication system?

• A. It uses a single circuit that operates with a backup pump
• B. It uses multiple valves to throttle oil
• C. It uses two identical circuits; if one fails the other continues to lubricate
• D. It uses an electric pump to circulate oil

Answer: (D)

Redundancy means having a backup path so lubrication stays active even if part of the system fails. The best description is two identical circuits; if one fails, the other continues to lubricate. This setup provides a seamless failover, which is what redundancy is all about.

The other ideas describe different aspects: a single circuit with a backup pump still uses one lubrication path, which isn’t as robust as a true redundant alternative; throttling valves focus on control rather than continuing flow during a failure; an electric pump describes how oil is moved but doesn’t address what happens if a component in the path fails.