CHEMCO Exit Exam • Set 1 Question 21 of 30

What is the function of a toxic gas detector tube system (e.g. Dräger tube)?

✓

Direct Answer

Option C: Measure specific chemical vapor concentrations in ppm by colorimetric reaction

Toxic gas detector tube systems, like Dräger tubes, function by reacting with specific airborne chemicals. This colorimetric reaction allows for the measurement of specific chemical vapor concentrations in parts per million (ppm), crucial for atmospheric monitoring as per safety guidelines.

All Options

Test battery

Measure oil viscosity

Measure specific chemical vapor concentrations in ppm by colorimetric reaction (Correct Answer)

Measure salinity

Detailed Explanation & Context

Relevant Framework: STCW 2010 Manila Amendments • DG Shipping E-Learning & Exit Exam Standards • Advanced Training for Chemical Tanker Cargo Operations (CHEMCO).

Practice Full CHEMCO Set 1

Test yourself with 30 interactive questions, live timer, and instant score.

Launch Practice Simulator →

Question Discussion & Notes

Have a doubt, memory trick, or exam update? Share your insights with fellow mariners.

Loading mariner discussions...

« Previous Question Next Question »

More Questions in CHEMCO Set 1

View All 30 →

Q1 Which IMO Code regulates the carriage of dangerous chemicals in bulk on chemical tankers? Q2 Under MARPOL Annex II, which pollution category presents the major hazard to human health or marine resources? Q3 What test is performed on tank bulkhead surfaces to detect microscopic hydrocarbon residues before loading sensitive chemical cargoes? Q4 What type of chemical tanker skin/tank construction is required for carrying high-hazard cargoes like Isocyanates? Q5 What material is widely used for cargo tanks carrying aggressive acids such as Nitric or Phosphoric acid? Q6 What is the key limitation of Zinc Silicate tank coatings in chemical tankers? Q7 What document must be maintained on board detailing all chemical cargo loading, discharging, tank washing, and slop handling? Q8 What is self-polymerization in chemical cargoes? Q9 What mandatory document provides chemical property, health hazard, reactivity, and emergency response data for a chemical cargo? Q10 What system is used to purge chemical lines and maintain an inert nitrogen cushion over moisture-sensitive cargoes?