MEOclassIIexamnotes

 Determined at the design stage based on vessel size, number of mooring lines , wind area and tidal conditions and the mean braking load of mooring lines. After selection of the  MBL of the mooring line, the winch heaving load will be set to a lower value than MBL to prevent the winch motor from applying excessive loads

The chain block contains two cogs or gears in which the chain is wrapped around. Both electric chain blocks and manual chain blocks have the same fundamental functions - when the chain is pulled, it wraps around the wheels which adds torque to the lifting mechanism, pulling the item that is on the other end of the chain (usually with a strong hook) and lifting it off the ground - the wheels inside the block are how they are able to lift heavy loads - even when operated manually. when the chain is release a braking mechanism kicks in and holds the load where it is until the chain is pulled again. A chain block has a strong chain for lifting objects and attaching hooks to, manual lifting blocks have a hand chain which can be used for pulling by hand to bring the load up (these are powered by motors in electric chain blocks), they also have a grabbing load hook for attaching the load . 

Dept of rudder / width of the rudder. High aspect ratio is used in large vessels where depth is not a constraint.  Higher aspect ration reduces the astern torque considerably

Rudder stock is carried in the rudder trunk which as a rule is not made water tight at lower end , but water tight gland at top of the trunk ;ie, where the stock enters the intact hull. Trunk kept short so that the stock has minimum unsupported length.  Watertight opening for inspection

 A 0.5 mm diameter piano wire is stretched along each side of the bedplate. The wire is loaded with 40 KPa horizontal force. At the centre line of each cross girder , the distance is measured between the wire and the machined faces of the bedplate top outside oil grooves It will thus be revealed whether the later has changed compared with values during engine installation. The measurement are taken by micrometer with laser light when touches wire.

Chlorine content on effluent STP is operational or not Corrosion or hole on the tank holding to tank Aeration blower working and checking the pressure Overboard valve locked and sealed. Seal number recorded on logbook Validity of international sewage pollution prevention certificate Proper air lift from settling tank to aeration chambers Working of high level alarms and auto cut off Presence of Chlorine tablets or UV lamp 

Propeller blade system is designed for maximum efficiency in ahead direction In astern direction angle of attack is high on the back of the blade. Propeller will absorb very little available power. Severe eddying occurs on face(efficiency is low) Hence if 80% of Full ahead power is available for astern then boosting it to 100% will have minimal return in thrust