With the battery master switch OFF, the electrical system's ability to start engines is

• A. None; starting power is not available
• B. Unchanged
• C. Increased
• D. Dependent on external power source

Answer: (B)

The starting capability of the engines is not affected by turning off the battery master switch in regular operation because starting energy can come from a source that bypasses the main electrical bus. If an external power source (like ground power) or a dedicated start circuit is available, it can energize the starter and allow the engines to start even with the battery master switch off. So, under normal conditions with power available from another source, the ability to start remains the same. If no external or alternate power is available, starting would be blocked.