When the air/fuel ratio is expressed as lambda, a lambda number of less than 1 indicates a(n) ________ exhaust.
A) rich
B) excessively cold
C) lean
D) excessively hot

Question

Quizplus · Accepted Answer

When the lambda number is less than 1, it means there is less oxygen (O2) in the exhaust than the ideal air/fuel ratio of 14.7:1. This indicates that there is an excess of unburned fuel, which characterizes a rich exhaust.

When the Air/fuel Ratio Is Expressed as Lambda, a Lambda