Knowledge material

What is I.S.M. ? The International Management Code for the Safe Operation of the Ships and for Pollution Prevention (International Safety Management (ISM) Code). What is I.M.O. Convention ? Conventions are main instruments of IMO, being binding...

A semiconductor is a type of material posses electrical conductivity between conductor and an insulator.They are neither good conductor nor good insulators. The electrical resistivity of semiconductor generally decreases strongly with increasing temperature.Semiconductor atoms...

Alternators used for parallel running are required to have a protective device which will release the breaker and prevent motoring if reversal of powering occurs. Such type of device would prevent damage to prime...

An electric battery is a device consists of two or more electrochemical cells that convert stored chemical energy into electrical energy. Each cell has +ve terminal (cathode) and a –ve terminal(anode). The terminal marked...

It is a device which is used to indicate the current position of the rudder blade, normally fitted in the wheelhouse, bridge wings and engine control room. A rudder angle indicator consists of a feedback...

Survey of MSB Proper cleaning to be carried internally as well as externally normally carried out when board is completely dead (all generator stopped and prime mover locked off). Inspect for dirt and dust (electro clean and vacuum...

SOLAS Requirements Emergency generator and ESB should be located above the uppermost continuous deck, not forward of collision of bulkhead.MSB or any machinery space should not interface with the supply control and distribution of emergency...

The a.c. shaft generator is a synchronous machine which produces alternating current with a frequency that is dictated by variations in engine speed. At the full rated r.p.m., frequency may match with the electrical...

Star Delta Starter This is means of reducing starting current of induction motor by initially connecting to the stator winding to ‘STAR’. Once the motor comes up to speed (68%) to be connected in DELTA. When motor start in ‘STAR’ it has the effect of: Reducing...

A shore supply is required so that the ships generators and their prime movers can be shut down for major overhaul during a dry dock period. Requirements/Checks There must be a suitable connection box conveniently located...