Refresher Exit Exam • Set 1 Question 8 of 30

Dry chemical powder extinguisher works on what principle?

✓

Direct Answer

Option B: Inhibition

Dry Chemical Powder (DCP) extinguishes fire primarily by chemical inhibition, where the powder interferes with the free radicals in the combustion chain reaction.

All Options

Cooling

Inhibition (Correct Answer)

Starvation

Smothering

Detailed Explanation & Context

Dry Chemical Powder (DCP) extinguishes fire primarily by chemical inhibition, where the powder interferes with the free radicals in the combustion chain reaction.

Relevant Framework: STCW 2010 Manila Amendments • DG Shipping E-Learning & Exit Exam Standards • Refresher Course for STCW Modular Courses (Refresher).

Practice Full Refresher 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 Refresher Set 1

View All 30 →

Q1 Fire Triangle Fill up the blanks Q2 Class A involves flammable liquids. True or False? Q3 What is the minimum capacity of emergency fire pumps in meter cube per hour? Q4 What is the best fire extinguisher for electrical fires? Q5 What is the color of light used for smaller boats? Q6 Fire extinguishing system required for propelling machines and diesel-driven motors: Q7 How many hours should a diesel-driven fire pump run? Q8 Dry chemical powder extinguisher works on what principle? Q9 Class B bulkheads are classified as B15 and B0. True or False? Q10 Maximum temperature of the unexposed side of a B class division: