MTC Marine Plumbing & Sanitation Systems 2

Question 1

What component is installed between the seacock and the raw water pump to protect the impeller from debris and marine growth?

Accepted Answer

Raw water strainer

Answer

Anti-siphon valve

Answer

Vented loop

Answer

Pressure relief valve

Question 2

At what interval should a raw water pump impeller typically be inspected or replaced on a marine engine?

Accepted Answer

Every 100 hours or annually, whichever comes first

Answer

Every 25 hours or at each seasonal launch

Answer

Every 500 hours or every 5 years

Answer

Only when overheating symptoms are observed

Question 3

What is the primary function of a bilge pump aboard a marine vessel?

Accepted Answer

To remove accumulated water from the lowest part of the hull

Answer

To circulate raw cooling water through the engine

Answer

To pressurize the onboard freshwater system

Answer

To transfer fuel between tanks when one runs low

Question 4

Which type of bilge pump system is designed to activate automatically without crew intervention when water reaches a preset level?

Accepted Answer

Electric centrifugal pump with an automatic float switch

Answer

Manual diaphragm pump operated by a handle

Answer

Hand-operated piston pump mounted at the helm

Answer

Submersible gear pump controlled by a timer

Question 5

What is the correct winterizing procedure for a marine vessel's freshwater plumbing system to prevent freeze damage?

Accepted Answer

Drain all water from lines and add non-toxic propylene glycol (RV) antifreeze

Answer

Fill all lines with seawater which has a lower freezing point than fresh water

Answer

Add automotive ethylene glycol antifreeze to the freshwater tanks

Answer

Leave water in the lines since modern marine hoses are freeze-resistant

Question 6

What is a 'barb' fitting most commonly used for in marine plumbing applications?

Accepted Answer

Connecting flexible hose to rigid pipe, pumps, or fixtures

Answer

High-pressure hydraulic hose connections

Answer

Through-deck watertight electrical penetrations

Answer

Rigid pipe-to-pipe threaded unions below the waterline

Question 7

What does 'positive flotation' mean in the context of a vessel's safety systems?

Accepted Answer

The vessel contains enough built-in buoyancy material to remain afloat even if the hull fills with water

Answer

The bilge pump creates positive water pressure to eject water overboard

Answer

The float switch maintains a positive electrical signal to the pump at all times

Answer

The pump is rated to maintain positive pressure in the bilge discharge line