Which is the following is not a Quality of “4-stroke engine”?

Explanation

In a 4-stroke engine, the four strokes (intake, compression, power, and exhaust) make up the engine cycle. The quality of a 4-stroke engine is generally characterized by efficiency in fuel combustion and utilization. Fuel is not fully consumed (a): This statement is correct. In a 4-stroke engine, fuel is expected to be fully consumed during the combustion process to maximize efficiency.