Small Engine Exam (#51-100)

The compression ratio tells us about the engine's:

• horsepower

• torque

• efficiency

• all of the above

The cam lobes:

• are timed with the camshaft gear so the valves are lifted at the correct time

• contour determines the speed of the valve opening

• contour determines the length of time the valves are open

• all of the above

Which of these is not a reason for valve failure?

• burned

• dished

• carboned

• necked

The first one or two numbers of the model number system indicates:

• horsepower

• oil capacity

• cubic inch displacement

• position of the crankshaft and carburetor

If there is a difference in the size of the valve head, the intake valve is _______ than the exhaust valve

• the same size

• smaller

• larger

Valves have to seal well enough to stand pressures up to ________ pounds per square inch

• 250 PSI

• 500 PSI

• 750 PSI

• 1000 PSI

The function of the crankcase breather is to remove ______ from the crankcase.

• oil

• air

• dirt

• gum

For the valves to open at the proper time the ______ marks must be aligned.

• spring

• hobbing

• timing

• plug

The compression release is designed to:

• reduce vibration

• prevent backfiring

• shut off the engine

• allow easier starting

Valves are held in the closed position by valve guides.

• True

• False