ICC Commercial Mechanical Practice Exam

On dust, stock and refuse conveying systems, the outlet of an open-air exhaust terminal must be protected to prevent the entry of what?

1. Sparks

2. Flammable gases

3. Birds

4. Outside air

The correct answer is: Sparks

The correct answer focuses on the need to prevent the entry of sparks into open-air exhaust terminals. In systems conveying dust, stock, and refuse, maintaining safety is paramount, especially with potential fire hazards. Sparks can ignite combustible materials that might be present in the exhausted air stream, leading to uncontrolled fires or explosions. In these systems, the main goal is to facilitate the safe removal of flammable or potentially hazardous materials while ensuring that external factors do not introduce new risks. While flammable gases, birds, and outside air could pose certain risks in some contexts, the most critical concern is the prevention of sparks, as they directly relate to fire safety in environments dealing with combustible dust and materials. This preventative measure is crucial in maintaining compliance with safety regulations and protecting both equipment and personnel.