RAFF Exit Exam • Set 3 Question 13 of 30
In a mixture of flammable vapour and air if there is too mush vapour and not enough air to support combustion, we say the mixture is
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Direct Answer
Option A: Too rich
Combustion requires fuel, oxygen, and heat within specific flammable limits. A mixture exceeding the upper explosive limit contains excessive hydrocarbon vapour and insufficient oxygen to sustain a chemical chain reaction, rendering it too rich.
All Options
A
Too rich
(Correct Answer)
B
Over concentrated
C
Too lean
D
Saturated
Detailed Explanation & Context
Combustion requires fuel, oxygen, and heat within specific flammable limits. A mixture exceeding the upper explosive limit contains excessive hydrocarbon vapour and insufficient oxygen to sustain a chemical chain reaction, rendering it too rich.
Relevant Framework: STCW 2010 Manila Amendments • DG Shipping E-Learning & Exit Exam Standards • Refresher Advanced Fire Fighting (RAFF).
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