Question

Ringelmann scale is used for:

• A. measuring CO
• B. measuring CO\(_2\)
• C. grade density of smoke
• D. grade automobile exhaust gas

Hint:

Ringelmann charts provide a quick field method for estimating smoke opacity without instruments.

Answer 1

The Correct Option is C

Step 1: Understanding the Ringelmann scale.
The Ringelmann scale is a visual method developed to assess the opacity or darkness of smoke emitted from chimneys and stacks.
Step 2: Purpose of the scale.
It compares the darkness of smoke with a set of standardized grey shades, ranging from clear (Ringelmann 0) to very dark (Ringelmann 5).
Step 3: Analyzing the options.
(A) Incorrect, CO concentration is measured using gas analyzers.
(B) Incorrect, CO\(_2\) is measured using infrared analyzers.
(C) Correct, the Ringelmann scale is specifically used to grade the density of smoke.
(D) Incorrect, automobile exhaust grading is not done using Ringelmann charts.
Step 4: Conclusion.
The Ringelmann scale is used to grade the density of smoke.