MEOclassIIexamnotes

 The nomenclature for bearings, such as the "NU 318" bearing, follows a standardized system that provides information about the bearing's type, dimensions, and other characteristics. Here's a breakdown of the "NU 318" bearing nomenclature: 1. **NU**: This indicates the type of bearing.    - **NU** stands for a cylindrical roller bearing with two flanges on the outer ring and no flanges on the inner ring. This design allows the inner ring to move axially relative to the outer ring, making it suitable for applications where axial displacement needs to be accommodated. 2. **3**: This digit represents the series of the bearing, which indicates the overall size and load capacity.    - **3** typically refers to a medium series bearing, which is designed to handle moderate loads and speeds. 3. **18**: This number indicates the bore diameter of the bearing.    - The bore diameter is calculated by multiplying the last two digits by 5. In this case, **18 x 5 = 9...

  The speed of the marine engine is controlled by an instrument known as governor, which can be of – hydraulic, electro-hydraulic or electronic governor type. The most famous types of governor used for both main engine and generator engine is the electro-hydraulic type marine governor. It’s because of this little instrument that the engine speed can be smoothly controlled from a remote space (bridge or engine control room). The different components of a governor allows for a steady state speed control, along with achieving the required variation in the load. Following are the important parts of the governor: – Synchronizer knob: This knob is used for controlling the speed of the engine with a single unit (Main engine) and controlling the load for engines with multiple unit (generator) – Speed droop knob: The speed droop knob helps in creating the stability and also divides the load equally among multiple generator engines running parallel – Load limit knob: This knob controls and l...