EETC EETC - Equipment & Engine Training Council Cooling Systems and Thermal Management Questions and Answers

Question 1

What is the primary function of the thermostat in a small engine cooling system?

Accepted Answer

Regulate coolant flow to maintain operating temperature

Answer

Increase coolant pressure

Answer

Filter debris from the coolant

Answer

Measure engine RPM

Question 2

Which type of cooling system uses fins on the cylinder and head to dissipate heat directly into the surrounding air?

Accepted Answer

Air cooling

Answer

Liquid cooling

Answer

Oil cooling

Answer

Evaporative cooling

Question 3

A technician notices white steam and a sweet smell from an air-cooled engine. What is the most likely cause?

Accepted Answer

Blown head gasket allowing coolant into combustion chamber

Answer

Clogged cooling fins reducing heat dissipation

Answer

Incorrect fuel mixture

Answer

Worn piston rings

Question 4

What is cavitation in a liquid-cooled engine water pump?

Accepted Answer

Formation and collapse of vapor bubbles that erode pump surfaces

Answer

Air being trapped in the cooling jacket

Answer

Coolant overheating due to blocked passages

Answer

Pump impeller spinning in reverse

Question 5

Which coolant additive prevents corrosion and scale buildup in liquid-cooled engine passages?

Accepted Answer

Corrosion inhibitor package in antifreeze

Answer

Ethanol

Answer

Mineral spirits

Answer

Two-stroke oil

Question 6

What symptom indicates a plugged or clogged cooling fin on an air-cooled engine?

Accepted Answer

Engine overheats and may shut down via thermal protection

Answer

Engine runs rich

Answer

Engine produces black smoke

Answer

Engine RPM surges at idle