IC Engine Practice Test: Two Stroke Engines — Flashcards

Two Stroke Engines topics include: Terminologies and definations, scavenging process and pumps, two stroke engine and its advantages, si and ci engines, advantages of four stroke engines.

A two-stroke engine is a type of internal combustion engine that completes a power cycle with two piston strokes during one power cycle. 

Two-stroke engines are used in many industries, including garden equipment and motorcycles. They are preferred when mechanical simplicity, low weight, and high power-to-weight ratio are the design priorities. 

Here are some steps in the working process of a two-stroke engine:
1. Compression stroke; The inlet port opens, the air-fuel mixture enters the chamber and the piston moves upwards compressing this mixture.
2. Power stroke: The heated gas exerts high pressure on the piston, the piston moves downward (expansion), waste heat is exhausted.
3. Spark plug: A spark plug delivers electric current to the combustion chamber which ignites the air-fuel mixture leading to abrupt expansion of gas.
4. Ignited gasses: The ignited gasses then move the piston down which rotates the crankshaft in half.
5. Momentum: The piston then moves up due to momentum and again compresses the fuel to repeat the cycle. 

Two-stroke engines have fewer parts than four-stroke engines, which gives them a simpler design, but also makes them less efficient. Two-stroke engines are also generally louder than four-stroke engines.