ASVAB Automotive - Engines

Front

During this cycle, a valve opens as a connecting rod pulls the piston DOWN, drawing the air/gas mixture into the cylinder.

Back

The Intake Stroke

Front

During this cycle, the valves are closed, and the connecting rod pushes the piston UP, compressing the air/gas mixture.

Back

The Compression Stroke

Front

During this cycle, the spark plug ignites the gas/air mixture, forcing the piston DOWN.

Back

The Power Stroke

Front

During this cycle, a valve opens as the connecting rod moves the piston UP, pushing out the exploded gases.

Back

The Exhaust Stroke

Front

This automotive part mixes fuel & air mechanically. It was commonly used in automobiles made before 1990, but its function is now performed by fuel injectors on most newer cars.

Back

The carburetor

Front

A fuel dispensing nozzle that injects liquid fuel directly into the engine's air stream and almost always requires an external pump.

Back

The Fuel Injector

Front

True or False: The octane rating of gasoline measures its ability to resist the "engine knock" caused by premature ignition of the fuel/air mixture in one or more cylinders.

Back

True

Front

True or False: The engine "knocking" sound only indicates that low octane fuel is being used. It has no effect on the engine's performance or how long the engine will last.

Back

False

Front

This part of the cooling system circulates water through "water jackets" surrounding the parts of the engine that reach the highest temperatures.

Back

The Water Pump

Front

Water that has absorbed heat from the engine passes through this part, where the outside air cools the water.

Back

The radiator