``` * **Reasoning:** This title is keyword-rich, including "GATE 2023," "Mining Engineering," "Question 35," "Mine Ventilation Air Calculation," "Oxygen," and "CMR 2017," which are all highly relevant search terms. It also incorporates the website name for branding. It directly addresses the content's core problem. **2. Meta Description:** ```html ``` * **Reasoning:** This description provides a concise summary of the question, highlighting the key parameters (oxygen consumption, CMR 2017, return air oxygen percentage - which is 19% as per CMR 2017 for underground workings, crucial for solving the problem). It uses action-oriented language ("Solve," "Calculate," "Master") and includes relevant keywords to attract clicks from search results. **3. Meta Keywords (Optional, but good for historical practice):** ```html ``` * **Reasoning:** This list includes a comprehensive set of terms people might use to search for this type of problem or content, covering the subject, exam, specific topic, and regulatory context. **4. Canonical URL:** ```html ``` * **Reasoning:** This tag explicitly tells search engines the preferred version of the page, preventing duplicate content issues and consolidating link equity. **5. H1 Tag (Main Heading on the Page):** ```html

GATE 2023 Mining Engineering Question 35: Mine Ventilation Air Calculation (Oxygen Consumption & CMR 2017)

``` * **Reasoning:** The H1 tag should be the primary heading on the page and clearly state what the page is about. This H1 is descriptive, includes all major keywords, and perfectly reflects the content of the question. ---

Mining Engineering > GATE 2023 > Mine Ventilation

In a panel with 50 workers, a miner typically consumes 2.5×10^-3m³/min of oxygen. The percentage of oxygen in the intake air is 20.95%. To ensure minimum permissible oxygen in the return air as per CMR 2017 the quantity of ventilating air in m³/min to be supplied to the panel is __________. [rounded off to 2 decimal places]

Correct : 7372.88

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