MTC Marine Plumbing & Sanitation Systems

Question 1

What type of valve must be installed on all thru-hull fittings located below the vessel's waterline?

Accepted Answer

Seacock (tapered plug or ball valve)

Answer

Gate valve

Answer

Butterfly valve

Answer

Check valve

Question 2

Which U.S. federal regulation classifies Marine Sanitation Devices (MSDs) into Types I, II, and III?

Accepted Answer

Title 33 CFR Part 159

Answer

Title 46 CFR Part 25

Answer

ABYC Standard H-33

Answer

NFPA 303

Question 3

A Type III Marine Sanitation Device (MSD) is best described as which of the following?

Accepted Answer

A holding tank that retains all sewage for pump-out ashore

Answer

A device that treats sewage to Coast Guard discharge standards

Answer

A device that treats sewage using chemical or biological processes before discharge

Answer

An incinerating toilet system that produces sterile ash

Question 4

What is the purpose of a Y-valve in a marine sanitation system?

Accepted Answer

To divert waste flow between the holding tank and overboard discharge

Answer

To increase flow pressure in the bilge pump circuit

Answer

To regulate raw water intake to the engine cooling system

Answer

To connect two separate freshwater tanks

Question 5

Which fitting material is NOT acceptable for use in a vessel's potable (drinking) water system?

Accepted Answer

Lead-containing bronze fittings

Answer

CPVC plastic fittings

Answer

PVC schedule 40 fittings

Answer

Stainless steel 316L fittings

Question 6

Per ABYC standards, how many hose clamps are recommended at each below-waterline hose connection?

Accepted Answer

Two stainless steel clamps per connection

Answer

One clamp centered on the fitting barb

Answer

One plastic and one stainless steel clamp

Answer

Three clamps spaced evenly along the hose

Question 7

What does 'raw water' refer to in the context of a marine engine cooling system?

Accepted Answer

Untreated seawater or lake water drawn directly from outside the hull

Answer

Freshwater stored in the engine's closed cooling loop

Answer

Treated water drawn from an onboard freshwater tank

Answer

Distilled water mixed with antifreeze in the closed coolant circuit