Four-Stroke EFI Gas Engine Fundamentals Quiz

What are the basic components of a four-stroke gas engine?

• Piston, connecting rod, crankshaft

• Crankshaft, flywheel, spark plug

• Piston, camshaft, flywheel

• Connecting rod, camshaft, flywheel

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

• To compress the air-fuel mixture

• To turn lateral motion into rotating motion

• To ignite the fuel

• To release exhaust gases

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

• The piston travels downward and the intake valve opens

• The piston travels upward and compresses the air-fuel mixture

• The spark plug fires

• The exhaust valve opens

During which stroke does the spark plug fire?

• Intake stroke

• Compression stroke

• Exhaust stroke

• Combustion stroke

What is the purpose of the exhaust stroke?

• To compress the air-fuel mixture

• To intake fresh air and fuel

• To ignite the fuel

• To release the burned air-fuel mixture

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

• Two

• Five

• Three

• Four

What does RPM stand for?

• Rotations per meter

• Revolutions per minute

• Rotations per minute

• Revolutions per meter

At wide open throttle, how many times may the crankshaft turn per second?

• 50 times

• 60 times

• 70 times

• 83 times

What is the role of the fuel injector in a four-stroke engine?

• To ignite the fuel

• To compress the air-fuel mixture

• To deliver a metered amount of gas

• To release exhaust gases

How many times does the piston travel up and down in one second at 5,000 RPM?

• 83 times

• 200 times

• 100 times

• 166 times