Marine Engineering

This question is generally asked to test your basic knowledge about the operation of machinery as we all know that if onboard STP is of anaerobic type then the microorganism break down biodegradable material in the absence of oxygen, but if it is of aerobic type then definitely STP will not work because Aerobic digestion is a bacterial process occurring in the presence of oxygen. If, however, there is insufficient oxygen for these bacteria then alternative bacteria dominate. These Anaerobic Bacteria produce Hydrogen Sulphide, Methane and Ammonia. These gasses are either highly toxic or flammable or both. In particular, Hydrogen Sulphide is toxic to humans in concentrations down to 10ppm and its flammable vapours are heavier than air so may build up in lethal pockets in enclosed spaces. So, if the blower stops working the aerobic bacteria may die and it will take a longer time to regenerate.

During the time of orals, everyone can able to tell the method but examiner wants to listen to what safety precautions you will take, that was important to mention before starting with the cleaning process. One of the biggest problem associated with the sewage treatment plant is gas hazards. Gas hazard in the sewage treatment plant are those due to inflammable and poisonous gases may be derived from three general sources. Low volatile liquids which enter as the part of sewage, or the product of fermentation or digestion of sewage. The inflammable or poisonous gases usually found in treatment plants are methane, carbon dioxide and possibly carbon monoxide and hydrogen sulphide if inhale in the cleaning process may cause death.

The basic principle of working of a biological treatment  plant is decomposition of the raw sewage. This process is done by aerating the sewage chamber with fresh air. The aerobic bacteria survive on this fresh air and decompose the raw sewage which is dispose off in the sea. Air is a very important criteria in the functioning  of the biological sewage plant because if air is not present, it will lead to growth of anaerobic  bacteria which produces toxic gases that are hazardous to health. Also after decomposition  of the sewage with anaerobic bacteria, a dark black liquid causes discoloration of water which is not accepted  for discharging. Thus in a biological sewage treatment plant the main aim is to maintain the flow of fresh air. Division of processes: The biological sewage  plant is divides into three chambers Aeration Chamber Settling tank Chlorination and Collection tank Aeration Chamber: This chamber is fed with raw sewage which ...

In any case, if the face shield of SCBA is leaking in the presence of poisonous gas. It might penetrate through the mask and made the person unconscious when we open the by-pass valve it will provide oxygen continuously and will maintain a positive pressure inside the face mask to prevent the entry of poisonous gas.

According to SOLAS chapter 3, section 3 of regulation 31 in cargo ships when the horizontal distance from the extreme end of the stem or stern of the ship to the nearest end of the closest survival craft is more than 100m shall carry, in addition to the normal liferaft requirements a liferaft stowed as far as forward or aft as is reasonable and practicable. Such liferaft or liferafts may be securely fastened so as to permit manual release.

Safety: Solas chapter 12 full Annex 6 full, mainly Voc part Dynamic stability, Gz curve Req for emg towing oil tanker shell exp plan Stealer plate FSS code full Swash bulkhead location, purpose Certificate Carried related to solas chapter 9 Motor: AE lo contamination all possible causes Purifier pairing disc, Lubrication, water transducer Water tube boiler entire construction, with nomenclature Fwg less vacuum reasons & effects, high salinity reasons ME unit overhaul, hydraulic jack All about Threads Turbocharger, purpose of diffuser, drawing Self and central priming arrangement of pumps Vacuum condenser safeties, why VC Copt, how water level maintained in VC types of gate valve if gate valve struck inside, what will happen ,what will be ur action Air starting valve TIMING diagram for single unit counter weights in crankshaft (in ME & AE - how it is fitted) types of fuel injection  bilge valve, diff between sdnr nd slv shaft earthing , what...

Safety: IEEC certificate under which annexure and chapter, validity Required eedi, attained eedi with formula MLC Certificate and port state inspection why came in force in2013, not 2006 .no of article in it. Dynamic test of lifeboat. Maintenance of centrifugal brake as 2nd engineer, no of brake. NOx technical file content.  Maintenance of portable fire extinguishers as per DG shipping. In the container ship, there are some box tell me the name of all. Sopep , what information , why provided , who approves??? why mild steel used for ship building , carbon %, difference between strength & hardness Instantaneous rate of discharge Precaution during inclining experiment. Annexe 3 Reception facilities Propeller pitch ratio. Centre of floatation. Safeties for bulk carrier About high density cargo loading What are all the rules regarding triangle marking on bulkcarrier loading high density cargo...wheater applicable to all types of bulk carrier loading high dens...