Exam Question

### (a) Mountings on a 4-Stroke Auxiliary Engine Cylinder Head
A typical 4-stroke marine auxiliary engine cylinder head is a complex component designed to seal the combustion chamber and house several critical engine mountings. For a full-marks answer, at least six of the following should be identified and described:
1. **Inlet and Exhaust Valves:**
* **Function:** These poppet-type valves control the intake of charge air and the expulsion of exhaust gases from the cylinder. Typically, modern engines have two inlet and two exhaust valves per cylinder head to improve gas exchange efficiency.