4 Stroke Engine Theory Quiz

What is the first stroke in a four-stroke engine cycle?

• Compression Stroke
• Power Stroke
• Exhaust Stroke
• Intake Stroke

During which 2 strokes does the piston move from B.D.C. to T.D.C.?

• Intake Stroke
• Compression Stroke
• Power Stroke
• Exhaust Stroke

What happens during the Power Stroke?

• Air and fuel are drawn in
• Gases are compressed
• A spark ignites the mixture
• Exhaust gases are expelled

Which stroke allows exhaust gases to escape the engine?

• Intake Stroke
• Compression Stroke
• Power Stroke
• Exhaust Stroke

What is the role of the intake valve during the Intake Stroke?

• It opens to release exhaust
• It closes to compress gases
• It opens to allow air and fuel in
• It remains closed throughout

How many rotations of the crankshaft are needed to complete the four strokes?

• One
• Two
• Three
• Four

What is created during the Compression Stroke?

• A vacuum
• An explosion
• Heat and pressure
• Air and fuel mixture

What is the purpose of the exhaust valve during the Exhaust Stroke?

• To allow air in
• To compress the mixture
• To release exhaust gases
• To ignite the fuel

Which of the following best describes the function of the spark plug?

• To compress the air-fuel mixture
• To ignite the compressed mixture
• To release exhaust gases
• To draw in air and fuel

What happens to the valves during the Compression Stroke?

• Both valves are open
• Both valves are closed
• Only the intake valve is open
• Only the exhaust valve is open