Question 16 OSE02 - Assistant Engineer - OSV

The Correct Answer is C ### Explanation for Option C (Hydraulic power operated system) Option C, **Hydraulic power operated system**, is correct because this type of system is characterized by the use of highly pressurized fluid (hydraulic oil) stored in a reservoir and an accumulator. When activated, the pressurized oil drives a hydraulic starter motor, which engages the engine flywheel to crank the engine. Hydraulic starting systems are widely used on auxiliary diesel engines in offshore environments, particularly for emergency systems, because they offer several advantages: 1. They deliver extremely high torque necessary for rapid starting. 2. They are reliable in cold or damp conditions. 3. The system usually includes a manual (hand) pump, ensuring the system can be recharged and the engine started even if electrical power (required for electric pump operation) is completely lost. The illustration (MO-0049) must show components such as the hydraulic accumulator (a pressurized cylinder), hydraulic lines, and the starter motor directly coupled to the high-pressure fluid lines, confirming the hydraulic nature of the system. *** ### Explanation of Incorrect Options **A) Electric power operated system:** This system uses electrical energy stored in batteries. The components would include a heavy-duty DC starter motor, thick battery cables, and a solenoid switch. These components look significantly different from the accumulator, pump, and fluid lines characteristic of a hydraulic system. **B) Pneumatic power operated system:** This system (often called Air Start) uses high-pressure compressed air stored in large air receivers. The starting mechanism utilizes an air starter motor or, for larger main engines, direct air admission valves. The visual representation would show large air tanks, air control valves, and specialized high-pressure air piping, which is distinct from the oil reservoir and accumulator associated with hydraulic systems. **D) Gas engine power operated system:** This is not a standard category for modern diesel auxiliary engine starting systems on marine vessels. While historical or specialized systems might use a small auxiliary gasoline or propane engine (a 'pony motor') to manually crank a larger engine, this is mechanically complex and would not be identified simply as a 'gas engine power operated system' in the context of standard vessel nomenclature.