EETC - Equipment & Engine Training Council Four-Stroke Engine Systems Questions and Answers

Question 1

A technician is servicing a four-stroke engine that runs erratically under changing loads. Which component is most likely responsible for maintaining a consistent engine speed?

Accepted Answer

Governor system

Answer

Flywheel

Answer

Ignition coil

Answer

Crankshaft

Question 2

During which phase of the four-stroke cycle are both the intake and exhaust valves momentarily open at the same time?

Accepted Answer

Valve overlap

Answer

Power stroke

Answer

Compression stroke

Answer

Intake stroke

Question 3

A customer's small engine will not start. A compression test reveals a reading of 40 PSI, which is significantly below the manufacturer's specification. Performing a 'wet' compression test, where a small amount of oil is added to the cylinder, results in the compression reading increasing to 95 PSI. What is the most likely cause of the low compression?

Accepted Answer

Worn piston rings

Answer

A blown head gasket

Answer

A stuck open intake valve

Answer

A cracked cylinder head

Question 4

Which of the following is a primary function of the flywheel in a four-stroke engine?

Accepted Answer

To store rotational energy

Answer

To mix the fuel and air

Answer

To open and close the valves

Answer

To provide lubrication to the cylinder

Question 5

In a splash lubrication system, how is oil primarily distributed to the various moving parts of the engine?

Accepted Answer

A dipper on the connecting rod splashes oil from the sump.

Answer

A high-pressure pump forces oil through galleries.

Answer

Gravity feeds oil from a reservoir above the engine.

Answer

The fuel/oil mixture lubricates the components.

Question 6

When performing a compression test on a four-stroke engine, which of the following steps is essential for an accurate reading?

Accepted Answer

The throttle must be held wide open.

Answer

The fuel tank must be completely full.

Answer

The spark plug should be left in place.

Answer

The engine should be cold.