The air standard efficiency of Otto cycle depends on?

The Otto cycle is an ideal thermodynamic cycle used in petrol or spark ignition engines. The air standard efficiency of the Otto cycle mainly depends on the compression ratio of the engine. Compression ratio is the ratio between the maximum and minimum volume inside the cylinder. When the compression ratio increases, the thermal efficiency of the Otto cycle also increases. This happens because higher compression allows better conversion of heat energy into mechanical work.
The efficiency of the Otto cycle is given by a formula that includes the compression ratio and the specific heat ratio of air. It does not directly depend on the type of fuel used, engine size, or cylinder material. Although these factors may affect engine performance in practical situations, the ideal air standard efficiency is determined mainly by the compression ratio.
In petrol engines, engineers try to increase the compression ratio to improve fuel efficiency and engine performance. However, very high compression ratios can cause engine knocking, so a suitable balance is maintained. Understanding the Otto cycle is important in mechanical and automobile engineering because it explains the working principle of internal combustion engines. Therefore, the correct answer is B. Compression ratio.