STCW Firefighting Techniques 4

Question 1

Which type of foam is specifically designed for use on polar solvent (alcohol-type) fires such as acetone or ethanol?

Accepted Answer

AR-AFFF (Alcohol-Resistant AFFF)

Answer

Alcohol-resistant AFFF (AR-AFFF) contains a polymer that forms a protective membrane preventing alcohol-type solvents from breaking down regular foam.

Question 2

The International Shore Connection (ISC) used in port firefighting operations has standardized dimensions to allow:

Accepted Answer

Ship's crew to connect to shore fire hydrant systems using port fire hoses

Answer

The ISC provides a universal coupling so shore fire brigades can connect their hoses to a ship's fire main when port assistance is needed.

Question 3

What is 'flashover' in the context of compartment fires?

Accepted Answer

A sudden, simultaneous ignition of all combustible materials in a compartment due to radiant heat

Answer

Flashover occurs when radiant heat raises all room contents to ignition temperature simultaneously, causing instantaneous total-room involvement.

Question 4

When using a dry powder extinguisher on a fire, the operator should aim the discharge at:

Accepted Answer

The base of the fire, sweeping side to side

Answer

Aiming at the base of the fire and sweeping covers the burning fuel surface, interrupting the combustion chain reaction most effectively.

Question 5

A ship's fire pump must maintain a minimum pressure and flow sufficient to reach:

Accepted Answer

Any point in the ship simultaneously from at least two nozzles

Answer

SOLAS requires fire pumps to deliver simultaneous water supply to at least two hydrants anywhere aboard the vessel.

(STCW) Standards Certification and Watchkeeping for Seafarers Practice Test

(STCW) Standards Certification and Watchkeeping for Seafarers Practice Test

STCW Firefighting Techniques 4