LGTCO/LGTF Exit Exam • Set 5 Question 26 of 30

What is the primary extinguishing chemical filled in an ABC-rated Dry Chemical Powder (DCP) extinguisher?

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Direct Answer

Option C: Mono-ammonium phosphate

ABC multipurpose dry chemical fire extinguishers are filled with mono-ammonium phosphate powder, which forms a sticky residue that smothers Class A embers and breaks Class B/C chemical chain reactions.

All Options

Potassium bicarbonate

Sodium bicarbonate

Mono-ammonium phosphate (Correct Answer)

Sodium, magnesium and aluminium powder

Detailed Explanation & Context

Relevant Framework: STCW 2010 Manila Amendments • DG Shipping E-Learning & Exit Exam Standards • Liquefied Gas Tanker Cargo Operations (LGTCO/LGTF).

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Q1 What are Gas Hydrates in liquefied gas operations? Q2 What are Peroxides in chemical and gas cargo handling? Q3 Liquefied gas cargo tank contents are bounded directly by the: Q4 A device used to determine the liquid-vapour interface during the ullaging of semi-pressurized and fully pressurized tanks is a: Q5 Which of the following is an example of a closed gauging system that does not penetrate the cargo tank shell? Q6 Where on a firefighter wearing SCBA is the fireproof 30-metre lifeline attached? Q7 Which of the following is a solid desiccant medium that dries gas by adsorption of water molecules? Q8 The temperature at which condensation will take place within a gas mixture if further cooling occurs is known as: Q9 A gauging system employing a device which penetrates the tank and which, when in use, permits a small quantity of cargo vapour or liquid to escape to atmosphere is known as: Q10 Float gauges installed on liquefied gas tankers are an example of which gauging category?