Secondary Air Injection reduces emissions of which pollutants after combustion?

Unlock all questions

This demo includes only 20 questions. Upgrade to access hundreds of questions, flashcards, exam simulations, and disable ads.

Full question bankExam simulationsFlashcards
From $24.99Unlock all

Prepare for the California BAR Smog Technician Test. Review key topics with flashcards and multiple choice questions, each question includes hints and explanations. Get ready to ace your exam!

Multiple Choice

Secondary Air Injection reduces emissions of which pollutants after combustion?

Explanation:
Secondary air injection adds fresh air to the exhaust after combustion to promote oxidation of unburned fuel. That extra oxygen helps convert remaining hydrocarbons (HC) and carbon monoxide (CO) into carbon dioxide and water, especially when the catalytic converter isn’t yet at operating temperature. That’s why HC and CO emissions are reduced. It doesn’t directly target sulfur oxides or ozone, and NOx is more tied to combustion temperature and engine conditions rather than this after-treatment step. So the pollutants most affected by secondary air injection are HC and CO.

Secondary air injection adds fresh air to the exhaust after combustion to promote oxidation of unburned fuel. That extra oxygen helps convert remaining hydrocarbons (HC) and carbon monoxide (CO) into carbon dioxide and water, especially when the catalytic converter isn’t yet at operating temperature. That’s why HC and CO emissions are reduced. It doesn’t directly target sulfur oxides or ozone, and NOx is more tied to combustion temperature and engine conditions rather than this after-treatment step. So the pollutants most affected by secondary air injection are HC and CO.

More Multiple Choice Questions
Subscribe

Get the latest from Examzify

You can unsubscribe at any time. Read our privacy policy