Plant Operation Practice Test

What type of flow does the term "forced draft" specifically refer to?

1. Air flow created by a fan

2. Natural convection

3. Pumped water flow

4. Open vent flow

The correct answer is: Air flow created by a fan

The term "forced draft" specifically refers to airflow that is actively moved by mechanical means, such as a fan or blower. This process involves pushing air into a space or system under pressure, which enhances the delivery of air to combustion processes, improves ventilation, or influences the movement of gases within various industrial applications. In contrast to natural convection, which relies on differences in temperature and density for airflow without mechanical intervention, forced draft systems enable precise control over airflow rates and distribution. This mechanical influence can significantly affect efficiency in processes requiring consistent and regulated air supply. Pumped water flow refers to the movement of water through piping systems via mechanical pumps, and open vent flow describes the movement of air through openings without the aid of mechanical devices. These concepts differ fundamentally from forced draft systems, which are concentrated specifically on controlled air movement generated by mechanical fans.