MTC Marine Technician Engine Systems 2

Question 1

What is the purpose of a marine engine's raw water strainer?

Accepted Answer

To filter debris before water enters the cooling system

Answer

The raw water strainer removes debris and particulates from seawater before it reaches the impeller and cooling circuit.

Question 2

A four-stroke inboard diesel engine fires on which stroke?

Accepted Answer

Power stroke

Answer

Combustion occurs at the top of the compression stroke and drives the piston down during the power (expansion) stroke.

Question 3

Which component in a marine diesel injection system controls the precise timing and quantity of fuel delivery?

Accepted Answer

Injection pump

Answer

The injection pump meters and pressurizes fuel, delivering it to injectors at the correct timing and quantity for each cylinder.

Question 4

When inspecting a flexible engine mount, which condition warrants immediate replacement?

Accepted Answer

Rubber bonded to metal showing cracks or separation

Answer

Cracks or separation in the rubber-to-metal bond indicate the mount has failed its isolating function and can allow damaging vibration or engine misalignment.

Question 5

What does a high exhaust back pressure reading indicate on a marine engine?

Accepted Answer

Restriction in the exhaust system

Answer

Elevated back pressure indicates a blockage or restriction—such as a clogged muffler or collapsed hose—that impedes exhaust gas flow.

(MTC) Marine Technician Certification Practice Test

(MTC) Marine Technician Certification Practice Test

MTC Marine Technician Engine Systems 2