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CHIEF MATE EXAM ORAL QUESTIONS AND ANSWERS - LATEST QUESTIONS | Page 201
Q. 2001) Chain register and rigging plan ?
XQ. 2002) Orthomorphic projection ?
XQ. 2003) What are the test for container ? what is racking stress ?
X
Container placed on four supports located exactly on the four bottom corner castings. Now the so mentioned weight is applied to rack it transversely (i.e., the bottom will be fixed and only the top part will be shifted longitudinally bending the corner castings and vertical members) and check for its integrity. The value mentioned in the safety approval plate is that for the transverse test and not for the longitudinal. Hope i'm right!!! Ref- CSC annex-2
Q. 2004) What is triparty agreement ?
XQ. 2005) Ror cards- NUC vessel
XQ. 2006) What is igc code ? type of gas carrier as per igc code ?
X
The International Code for the Construction and Equipment of Ships Carrying Liquefied Gases in Bulk (IGC Code) applies to gas carriers constructed on or after1 July 1986. Gas carriers constructed before that date should comply with the requirements of the Code for the Construction and Equipment of Ships Carrying Liquefied Gases in Bulk or the Code for Existing Ships Carrying Liquefied Gases in Bulk.
Gas carriers are classified into three main types based on the hazardous nature of cargo:
1G : designed for most hazardous cargo
2G & 2PG: designed for lesser degree of hazard (mostly LPG and LNG)
3G : designed for least degree of hazard
Q. 2007) What is dgps.
X
differential GPS - shore stations are equiped with DGPS programme. they provide ships with small correction to the ship's position that may be necessary to get the exact position. DGPS is nothing but an additional correction to the position obtained by GPS.
Q. 2008) Contents of astm table & also which table is for which purpose ?
XQ. 2009) Ror cards- fishing v / ls at anchor .
XQ. 2010) What is boil over & boil off ?
XA Boilover type of fire refers to an extremely hazardous situation where a semi-enclosed oil or petrochemical fuelled fire is being attempted to be extinguished with water. This situation is caused by the relative density difference of oil/petrochemicals and water. Oil, being lighter than water, causes it to always want to be the surface layer.
As water is being pumped onto the surface of the fuel (where the flames are evident) it will quickly sink below the fuel, to collect at the bottom of the container, doing little to extinguish the flames. As the temperature of the fire slowly builds, descends down through the fuel, it will eventually reach the water that has collected at the bottom of the container. The descending heatwave will have a temperature sufficient to cause the water to vaporise into steam, expanding to more than 1700 times its volume as compared to in its liquid state. The rapidly expanding (possibly superheated) steam expels the fuel upward to boilover and out of the container discharging the, still ignited, fuel onto a large and uncontrolled area outside of the container
Boil off : A small amount of LNG evaporates from the tank during storage, cooling the tank and keeping the pressure inside the tank constant and the LNG at its boiling point.
