OCTCO/OCTF Exit Exam • Set 5 Question 7 of 30

What factor mainly affects Vapor cloud dilution rate?

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Direct Answer

Option B: Weather conditions

The rate of dispersion and dilution of a hazardous vapour cloud in the atmosphere is primarily governed by prevailing ambient weather conditions (wind speed, turbulence, atmospheric stability).

All Options

Quantity of Spill

Weather conditions (Correct Answer)

Thermal inversion

diameter of the vapor cloud

Detailed Explanation & Context

The rate of dispersion and dilution of a hazardous vapour cloud in the atmosphere is primarily governed by prevailing ambient weather conditions (wind speed, turbulence, atmospheric stability).

Relevant Framework: STCW 2010 Manila Amendments • DG Shipping E-Learning & Exit Exam Standards • Oil and Chemical Tanker Cargo Operations (OCTCO/OCTF).

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