Yacht Second Engineer Certification Exam: Marine Diesel Engineering

Atomisation refers to the process of breaking down liquid fuel into small droplets to mix with air for combustion.

Labyrinth glands are used to prevent oil leakage and ensure proper lubrication within the turbocharger.

The main components of a diesel engine piston include crown, skirt, pin boss, and rings.

<p>The gas force generated by combustion pushes the piston downwards, transferring mechanical energy to the connecting rod and then to the crankshaft.</p> Signup and view all the answers

<p>A simple hydraulic governor regulates engine speed by controlling the flow of hydraulic fluid to adjust the fuel supply, maintaining a constant speed.</p> Signup and view all the answers

<p>Factors such as fuel viscosity, injection pressure, air-fuel ratio, and cylinder design influence atomisation, penetration, and compression ratio.</p> Signup and view all the answers

<p>The diffuser in a turbocharger converts high-velocity gas into high-pressure gas before entering the engine.</p> Signup and view all the answers

<p>The inducer in a turbocharger helps to guide air smoothly into the compressor wheel, improving airflow efficiency.</p> Signup and view all the answers

<p>The thrust bearing in a turbocharger supports the axial thrust load, ensuring proper alignment and smooth operation.</p> Signup and view all the answers

<p>An overspeed trip of the centrifugal type operates by using centrifugal force to actuate a mechanism that shuts down the equipment when the speed exceeds a certain limit.</p> Signup and view all the answers

<p>The main components of a fuel injector nozzle include the nozzle body, needle valve, spring, and nozzle tip.</p> Signup and view all the answers

<p>Atomisation refers to the process of breaking down liquid fuel into small droplets or particles to improve combustion efficiency.</p> Signup and view all the answers

<p>Penetration is the ability of the fuel spray to reach deep into the combustion chamber for proper mixing and combustion.</p> Signup and view all the answers

<p>Factors influencing centrifugal separator efficiency include bowl speed, viscosity of the fluid, density difference, and temperature.</p> Signup and view all the answers

<p>Oil loss in a separator can occur due to overflow, emulsification, or improper sealing. It can be minimized by adjusting settings, maintaining seals, and monitoring levels regularly.</p> Signup and view all the answers

<p>The factors determining the discharge frequency of an engine lubricating oil purifier include the quality of the oil, operating conditions, and the level of contaminants present.</p> Signup and view all the answers

<p>Variations in the oil level of a main engine sump can be caused by temperature changes, leaks, incorrect filling, or oil consumption.</p> Signup and view all the answers