STCW Marine Environmental Protection & Compliance 3

Question 1

Under the Ballast Water Management Convention, what does the D-2 standard specify?

Accepted Answer

Maximum number of viable organisms permitted per cubic meter in discharged ballast water

Answer

The D-2 standard sets performance criteria limiting viable organisms (e.g., ≤10 organisms/m³ >50 µm) in discharged ballast water after treatment.

Question 2

Which annex of MARPOL specifically addresses sewage discharge from ships?

Accepted Answer

Annex IV

Answer

MARPOL Annex IV regulates the discharge of sewage from ships, setting distance and treatment requirements.

Question 3

What is the primary function of an oily water separator (OWS) aboard a ship?

Accepted Answer

Separate oil from bilge water so effluent meets the 15 ppm discharge limit

Answer

The OWS processes oily bilge water to reduce oil content to 15 ppm or less before any overboard discharge outside special areas.

Question 4

A tanker is cleaning cargo tanks using the crude oil washing (COW) method. This technique primarily helps by:

Accepted Answer

Minimizing oily residues left in tanks, thereby reducing slops requiring disposal

Answer

Crude oil washing uses crude oil itself to wash tank residues, significantly reducing the volume of oily slops that must be managed or discharged.

Question 5

Under MARPOL Annex VI, what is a 'Tier III' NOx limit and when does it apply?

Accepted Answer

The strictest NOx emission limit, applicable in NOx Emission Control Areas (NECAs)

Answer

Tier III is the most stringent NOx standard under MARPOL Annex VI and applies to marine diesel engines operating in designated NOx Emission Control Areas.

(STCW) Standards Certification and Watchkeeping for Seafarers Practice Test

(STCW) Standards Certification and Watchkeeping for Seafarers Practice Test

STCW Marine Environmental Protection & Compliance 3