Carbon deposit build up on the injection nozzle orifice is least likely to occur when using which type of fuel injector nozzle?

Correct Answer: Option B — Pintle

Pintle-type fuel injector nozzles feature a protruding pin that creates a hollow cone spray pattern. The mechanical movement of the pintle self-cleans the orifice during each injection cycle, making carbon deposit buildup significantly less likely compared to multi-hole nozzles.