3rd Class Power Engineering (3A2) Practice Exam

Natural gas is renowned for its clean-burning properties, which is a significant advantage when used for firing. When burned, natural gas primarily produces carbon dioxide and water vapor, along with minimal amounts of nitrogen oxides and other pollutants. This combustion process generates very few particulate emissions and leaves no solid residues, such as ash, that require removal. Consequently, the absence of ash deposits simplifies maintenance and reduces operational downtime, making natural gas an attractive option for both efficiency and environmental considerations.

This attribute contrasts sharply with higher carbon emissions associated with other fossil fuels, which produce more pollutants. The issue of ash production is also absent with natural gas since it does not yield any solid waste, further emphasizing the cleanliness of its combustion. Additionally, the mention of viscosity does not pertain to the combustion properties of fuels like natural gas, making it irrelevant in this context.