California Smog Check Inspector Practice Test

What is one of the calibration gases used by the BAR 97 EIS?

1. Nitrogen

2. Argon

3. Oxygen

4. Carbon Dioxide

The correct answer is: Nitrogen

One of the calibration gases used by the BAR 97 Emission Inspection System (EIS) is nitrogen. Nitrogen is commonly utilized in emission testing as it serves as a balance or carrier gas in the calibration process. This is vital for ensuring that the equipment provides accurate readings during smog checks. The presence of nitrogen helps to provide a controlled environment in which the other gases can be measured accurately. In the context of emission testing, it's important to note that calibration with the correct gases ensures that the system can detect pollutants accurately, maintaining compliance with state regulations. When nitrogen is used, it helps to stabilize measurements since it makes up a large majority of the atmosphere and does not react during the testing process. While argon, oxygen, and carbon dioxide can be relevant in other contexts or processes, they are not typically used as calibration gases in the BAR 97 EIS, which specifically implements nitrogen for its calibration procedures. This helps to ensure reliable and consistent performance of the emission inspection equipment.