Understanding the Four Engine Strokes

What is the primary purpose of the intake stroke in a four-stroke engine?

• To ignite the air-fuel mixture

• To draw air and fuel into the cylinder

• To expel exhaust gases

• To compress the air-fuel mixture

During the compression stroke, what happens to the air-fuel mixture?

• It is ignited by the spark plug

• It is expelled from the cylinder

• It is compressed to a smaller volume

• It is mixed with exhaust gases

Which component is responsible for igniting the air-fuel mixture during the power stroke?

• The piston

• The crankshaft

• The spark plug

• The camshaft

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

• To draw in air and fuel

• To compress the air-fuel mixture

• To convert fuel energy into mechanical work

• To expel exhaust gases

During the exhaust stroke, what happens to the exhaust gases?

• They are compressed

• They are ignited

• They are expelled from the cylinder

• They are mixed with fresh air

In which stroke does the piston move downward while the intake valve is open?

• Intake stroke

• Compression stroke

• Power stroke

• Exhaust stroke

What is the position of the piston at the end of the compression stroke?

• Top dead center (TDC)

• Bottom dead center (BDC)

• Midway in the cylinder

• At the same position as the intake stroke

Which stroke immediately follows the power stroke in a four-stroke engine cycle?

• Intake stroke

• Compression stroke

• Exhaust stroke

• Another power stroke

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

• Compression, Power, Intake, Exhaust

• Intake, Compression, Power, Exhaust

• Power, Exhaust, Intake, Compression

• Exhaust, Intake, Compression, Power

During which stroke is the piston moving upward and both the intake and exhaust valves are closed?

• Intake stroke

• Compression stroke

• Power stroke

• Exhaust stroke