REPFF Exit Exam • Set 1 Question 14 of 30
In a mixture of flammable vapor and air, if there is too much vapor and not enough air to support combustion, we say the mixture is
✓
Direct Answer
Option A: Too rich
A flammable vapor-air mixture exceeding the upper explosive limit contains excessive fuel concentration and insufficient oxygen to support combustion, rendering the atmosphere excessively rich and incapable of sustaining a flame.
All Options
A
Too rich
(Correct Answer)
B
Over concentrated
C
Too lean
D
Saturated
Detailed Explanation & Context
A flammable vapor-air mixture exceeding the upper explosive limit contains excessive fuel concentration and insufficient oxygen to support combustion, rendering the atmosphere excessively rich and incapable of sustaining a flame.
Relevant Framework: STCW 2010 Manila Amendments • DG Shipping E-Learning & Exit Exam Standards • Refresher Fire Prevention & Fire Fighting (REPFF).
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