CHEMCO Exit Exam • Set 6 Question 2 of 30

Which is the most accurate instrument for measuring the amount of oxygen in the atmosphere of a confined space?

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Direct Answer

Option B: Oxygen indicator

An oxygen indicator is specifically designed to accurately measure the percentage of oxygen in an atmosphere. While a combustible gas indicator detects flammable vapors, and a flame safety lamp indicates the presence of sufficient oxygen for a flame, neither provides precise oxygen level readings.

All Options

Combustible gas indicator

Oxygen indicator (Correct Answer)

Flame safety lamp

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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Q1 A combustible gas indicator will operate correctly ONLY when the Q2 Part A of the the ISGOTT Ship/Shore Safety Check-List provides operational procedures for: Q3 The approval period for a shipboard Oil Pollution Emergency Plan expires after Q4 Which of the listed functions is the purpose of a gas scrubber in an inert gas generation system? Q5 With an increase in temperature the volume of flammable and combustible liquids____. Q6 The standard unit of liquid volume used in the petroleum industry, as well as the tanker industry, is a __________. Q7 Combustible gas indicators operate by drawing an air sample into the instrument Q8 As required by Reg.31 of Annex 1 of Marpol the ODMCS should be provided with a recording device for _________ recording the discharge in litres per nautical mile and total quantity discharged. This discharge should be kept onboard at least for a period of _________ Q9 Which is the most accurate instrument for measuring the amount of oxygen in the atmosphere of a confined space? Q10 After each reading of an oxygen indicator, the instrument should be purged with