CHEMCO Exit Exam • Set 6 Question 30 of 30

Combustible gas indicators operate by drawing an air sample into the instrument

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Direct Answer

Option A: over an electrically heated platinum filament

Combustible gas indicators operate by drawing an air sample over an electrically heated platinum filament. The presence of flammable vapors causes the filament's resistance to change, which is then measured and displayed as a concentration percentage.

All Options

over an electrically heated platinum filament (Correct Answer)

where it is mixed with nitrogen

where it is ignited by a sparking device

where its specific gravity is measured

Detailed Explanation & Context

Relevant Framework: STCW 2010 Manila Amendments • DG Shipping E-Learning & Exit Exam Standards • Advanced Training for Chemical Tanker Cargo Operations (CHEMCO).

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