Exam Question

### (a) Arrangement of Valves in a Four-Ram Hydraulic Steering Gear
A four-ram hydraulic steering gear operates with two pairs of diagonally opposed cylinders. The valve arrangement is critical for safety, redundancy, and emergency operation. The primary valves are relief, make-up, isolating, and by-pass valves.
**(Diagram Description)**
The requested sketch would show a tiller connected to two rams via a Rapson-Slide mechanism. Two hydraulic power units (pumps) are depicted, each capable of operating the system independently. The piping illustrates how high-pressure hydraulic oil is directed to one pair of diagonal cylinders while the other pair returns low-pressure oil to the pump suction.