Understanding Engines

An engine is:

• a device that converts energy into mechanical power

• a type of vehicle

• a kind of fuel

• a tool for measuring speed

An engine is the central source of power in our automobiles and diesel trucks. It sends power down the ________.

• driveshaft

• transmission

• exhaust

• radiator

What is the first stroke of a four-stroke engine where the air and fuel mixture enters the engine?

• A) Compression

• B) Intake

• C) Power

• D) Exhaust

During which stroke of a four-stroke engine is the fuel and air mixture compressed?

• A) Power

• B) Exhaust

• C) Compression

• D) Intake

In a four-stroke engine, the mixture is ignited to propel the vehicle during the _______ stroke.

• Power

• Intake

• Compression

• Exhaust

What happens during the exhaust stroke of a four-stroke engine?

• A) Air and fuel mixture enters

• B) The mixture is ignited

• C) Spent gases are expelled

• D) The mixture is compressed.

What is Forced Air in the context of air introduction in engines?

• Air is forced into the combustion chamber to create more power, but with lower fuel efficiency.

• Air is naturally aspirated using atmospheric pressure.

• Air is cooled before entering the combustion chamber.

• Air is mixed with fuel before entering the combustion chamber.

Fill in the blank: Naturally Aspirated means that the air is brought in using ________ pressure, and naturally.

• atmospheric

• hydraulic

• vacuum

• mechanical

Diesel engines are generally more fuel efficient than gas engines due to diesel fuel being more _________.

• energy-dense

• viscous

• volatile

• expensive

Diesel is unfortunately more expensive than ________.

• gas

• electricity

• water

• coal