Fundamentals of a Four-Stroke Gas Engine

What is the main function of the piston in a four-stroke gas engine?

• To ignite the fuel

• To compress the air

• To travel up and down in the cylinder

• To rotate the crankshaft.

In a four-stroke engine, the _______ stroke involves the piston traveling upward to compress the air and fuel mixture.

• Intake

• Compression

• Combustion

• Exhaust

Which component turns the piston's up and down motion into a rotating motion?

• Spark plug

• Crankshaft

• Fuel injector

• Air intake manifold

The four-stroke cycle consists of intake, compression, combustion, and _______.

• A) Ignition

• B) Exhaust

• C) Rotation

• D) Expansion

How many strokes are needed to complete one cycle in a four-stroke engine?

• One

• Two

• Three

• Four

During which stroke does the spark plug ignite the fuel mixture?

• A) Intake

• B) Compression

• C) Combustion

• D) Exhaust

The intake stroke involves the piston moving _______ as the intake valve opens.

• Upward

• Downward

• Sideways

• Rotationally

What is the role of the exhaust valve in a four-stroke engine?

• To compress the air

• To release burned air-fuel mixture

• To ignite the fuel

• To intake air

In a four-stroke engine, the combustion stroke is followed by the _______ stroke.

• Intake

• Compression

• Exhaust

• Ignition

What is the sequence of strokes in a four-stroke engine?

• Compression, Intake, Combustion, Exhaust

• Intake, Compression, Combustion, Exhaust

• Combustion, Exhaust, Intake, Compression

• Exhaust, Combustion, Compression, Intake