Free EETC Two-Stroke Engines Questions and Answers

Question 1

Why do two-stroke engines typically produce more emissions compared to four-stroke engines?

Accepted Answer

Two-stroke oil and loss of air-fuel mixture through the exhaust port

Answer

Explanation:
Two-stroke engines produce more emissions primarily because they mix oil with the fuel, which burns and produces more pollutants. Additionally, the design of the engine leads to a loss of the air-fuel mixture through the exhaust port, contributing to unburned hydrocarbons and other emissions.

Question 2

Why do two-stroke engines generally cost less to manufacture compared to four-stroke engines?

Accepted Answer

They have fewer parts

Answer

Explanation:
Two-stroke engines cost less to manufacture primarily because they have a simpler design with fewer parts compared to four-stroke engines. This simplicity reduces the complexity of the manufacturing process, leading to lower production costs.

Question 3

In what positions can a two-stroke leaf blower operate effectively?

Accepted Answer

Any position

Answer

Explanation:
Two-stroke leaf blowers can operate effectively in any position due to their simple lubrication system, which does not rely on a sump and oil pump like four-stroke engines. This allows for flexibility in operation, making them suitable for various angles and orientations during use.

Question 4

On a two-stroke engine, the crankshaft turns how many degrees to complete one full cycle:

Accepted Answer

360 degrees

Answer

Explanation:
In a two-stroke engine, the crankshaft completes one full cycle in 360 degrees of rotation. This means the engine completes all four stages of the combustion process (intake, compression, power, and exhaust) in just one crankshaft revolution, unlike a four-stroke engine which requires 720 degrees.

Question 5

A two-stroke engine has a power stroke once _______.

Accepted Answer

every full revolution

Answer

Explanation:
In a two-stroke engine, a power stroke occurs once every full revolution of the crankshaft. This contrasts with a four-stroke engine, which has a power stroke once every two revolutions of the crankshaft.

EETC - Equipment & Engine Training Council Practice Test

EETC - Equipment & Engine Training Council Practice Test

Free EETC Two-Stroke Engines Questions and Answers