Question

Catalytic converters use lambda sensors to keep ______________

(a) exhaust temperature constant

(b) exhaust pressure constant

(c) excess air ratio within a range

(d) flow rate of air constant

This question was addressed to me during an online interview.

This interesting question is from Engine Management Systems in chapter Engine Electronics of IC Engine

Answer 1

The correct answer is:

(c) Excess air ratio within a range

Catalytic converters use lambda sensors (oxygen sensors) to monitor the air-fuel mixture and ensure the excess air (lambda) ratio remains within an optimal range for efficient operation and reduced emissions.