CHEMCO Exit Exam • Set 6 Question 3 of 30

After each reading of an oxygen indicator, the instrument should be purged with

✓

Direct Answer

Option B: fresh air

After each reading with an oxygen indicator, purging with fresh air is essential to clear the sensor of the tested atmosphere and ensure an accurate baseline reading for subsequent measurements, preventing cross-contamination and maintaining instrument calibration.

All Options

CO2

fresh air (Correct Answer)

the tested compartment's air

water

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