Question 16Steam Plants - Assistant Engineer70% to pass
When testing boiler flue gas with a chemical absorption apparatus, to obtain accurate results _______________.
AI Explanation
The correct answer is A) prevent any air from contaminating the gas sample.
When testing boiler flue gas using a chemical absorption apparatus, it is crucial to prevent any air from contaminating the gas sample. Air contamination can skew the results and lead to inaccurate measurements of the gas composition. To obtain accurate results, the gas sample must be isolated from any outside air and analyzed in a controlled environment.
The other answer choices are not directly relevant to ensuring accurate results in this specific test scenario. Analyzing for nitrogen content before oxygen content, running each analysis for at least 3 minutes, or purging the apparatus with air before use may be important in other contexts, but they do not address the primary issue of preventing air contamination of the gas sample.
Related Questions
#14 A flue gas analysis is performed to determine the _______________.#15 A mechanical carbon dioxide recorder operates by detecting the difference between air and the _______________.#17 If an analysis of boiler flue gas determines there is no excess air for combustion, you should expect the nitrogen content of the flue gas to be approximately _______________.#18 Generally, a 12% to 14% content of carbon dioxide in boiler flue gases indicates _______________.#19 Assuming all burners are clean and the fuel oil is at the correct temperature, it is considered good practice to adjust the excess air until a light brown haze is obtained. With the aid of a chemical based flue gas analyzer, the percentage readings (not necessarily in order) should indicate _______________.