G2 Gas Fitter Practice Exam

Which two products are undesirable from incomplete combustion?

1. Carbon monoxide and nitrogen

2. Carbon dioxide and aldehydes

3. Water vapor and soot

4. Ozone and sulfur dioxide

The correct answer is: Carbon dioxide and aldehydes

The question pertains to the products of incomplete combustion, which occurs when there isn't enough oxygen available to allow the fuel to react completely. This can lead to various harmful byproducts. In the context of the question, carbon dioxide is a typical product of complete combustion whereas aldehydes are indeed notable products of incomplete combustion. Aldehydes, such as formaldehyde, can be harmful and are often associated with health issues when inhaled. This makes the combination of carbon dioxide and aldehydes particularly undesirable as they indicate that not all fuel was burned properly, leading to a less efficient process and the presence of potentially toxic substances. Understanding the implications of incomplete combustion is crucial for gas fitters, as it affects not just the efficiency of the fuel being used but also safety and environmental factors. Identifying undesirable combustion products helps in assessing the quality of combustion systems and ensuring that ventilation and appliance settings are adequate to promote complete combustion.