Fuel Injectors and Atomization

What is the primary function of a fuel injector in an internal combustion engine?

• introduce fuel into the combustion chamber

• filter impurities from the fuel

• lubricate the engines moving parts

• cool down engine

Why is fuel atomization needed for efficient combustion?

• it reduces the engines temperature

• it decreases the amount of fuel needed

• it allows for a more uniform air-fuel mixture

• increases fuels octane rating

What happens during the atomization process in a fuel injector?

• fuel is compressed into a solid state

• fuel is heated to it's boiling point

• fuel is mixed with oil for lubrication

• fuel is broken down into small droplets

How does atomization affect the surface area of the fuel exposed to the air in the combustion chamber?

• it increases surface area

• it keeps the surface area the same

• it first increases, then decreases the surface area

• it decreases the surface area

How does the design of the fuel injector nozzle affect fuel atomization?

• it can create larger fuel droplets for slower combustion

• it has no impact on atomization

• it only affects the direction of the spray, not the size of the droplets

• it creates smaller fuel droplets for more efficient combustion

Three things are needed for combustion to occur. Which of the following is NOT one of those things?

• oxygen

• fuel

• carbon dioxide

• heat

True or False? Bernoulli's principal states that as speed of a fluid increases the pressure decreases.

• True

• False

Higher pressure areas push fluid towards _____ pressure areas.

• high

• low

True or False? Fluid with a higher viscosity is easier to atomize.

• True

• False

The ideal air to fuel ratio is ____ to 1.

• 4

• 14.7

• 14

• 2