Four-stroke engine

High school (ages 12+)
Transportation

Name:

Date:

Step 1 · Read the article

Open the article and read it at the level above. Then answer the questions below in your own words.

https://smallwhale.org/articles/four-stroke-engine

Write what each word means, using the article.

Do not copy the article. Write two things you learned, the way you would explain them to a friend.

Answers below are taken from the article’s stored facts, so they match what the student read.

1. What is the key innovator?Nicolaus Otto
2. What is the year of major patent?1876
3. What is a four-stroke engine and how does it work?A four-stroke engine has four steps: the intake stroke pulls in fuel and air, the compression stroke squeezes it, the power stroke ignites the mixture to push the piston down, and the exhaust stroke pushes out the spent gases. This cycle repeats to keep the engine running.
4. Who invented the four-stroke engine?The practical four-stroke engine was invented by Nicolaus Otto in 1876, who added a better compression phase before ignition.

Internal Combustion Engine: An engine where the combustion of fuel occurs with an oxidizer in a combustion chamber that is an integral part of the working fluid flow circuit.
Thermal Efficiency: The ratio of useful work performed by the engine to the total energy input from the fuel.
Torque: A twisting force that causes rotation, essential for driving wheels or propellers.