SPECIMEN EXAMINATION FOR THIRD MATE 



25 



How would you remove any odors 

 after discharging refrigerated cargo? 



After discharging refrigerated cargo, 

 what are the advantages of thoroughly 

 airing the cold storage compartments? 



In defrosting coils in reefer spaces 

 using sea water, what precautions 

 should be taken to assure cleanliness? 



How are drains in refrigerated 'tween 

 deck spaces fitted to preserve insulation 

 when carrying cargoes that require a 

 very low temperature? 



Where lower holds are used for 

 frozen cargoes, how may bilges be kept 

 free from frozen watei'? 



Describe briefly the methods employed 

 to provide refrigeration in the holds of 

 vessels. 



What would you do if you noticed a 

 large quantity of oil on the water near 

 your vessel while loading bulk oil on a 

 tanker? 



If you were loading a cargo of gaso- 

 line and a tug tried to come alongside 

 in the way of cargo tanks, what would 

 you do? 



What should be done with oil in the 

 oil hose after the oil transfer has been 

 completed? 



State the hazards incident to the re- 

 frigeration of perishable cargo by 

 means of blocks of so-called "dry ice." 



In lifting a cargo of heavy oil, when 

 the vessel is down to her marks before 

 all tanks are full, is it best to leave 

 each tank slack or to fill up as many 

 tanks as possible, and leave only the 

 minimum number of tanks slack? Ex- 

 plain your answer. 



In an emergency, is it necessary for 

 the senior officer on a tank vessel to 

 follow the tanker rules? 



In transferring an oil cargo, what 

 would you do if your vessel surges 

 badly along the dock? 



An oil hose has an inside diameter 

 of 6 inches. What is the minimum 

 radius circle in which such an oil hose 

 should be bent? 



Sketched is a typical tank top ar- 

 rangement on a tank vessel. Name and 

 state the purpose of "A," "B," and "C." 



What precaution should be taken to 

 prevent a deck spill from running over- 

 board? 



In transferring an oil cargo, what 

 would you do if the oil hose got pinched 

 between vessel and the dock? 



What is meant by "topping off" an 

 oil tanker? 



In starting to transfer an oil cargo, 

 what would be your duties and how 

 would the oil pumps be operated? 



Describe what is meant by: 



(a) Grade A inflammable liquid. 



(b) Grade B inflammable liquid. 



(c) Grade C inflammable liquid. 



(d) Grade D combustible liquid. 



(e) Grade E combustible liquid. 

 In rigging a windsail to ventilate oil 



tanks after cleaning operations, would 

 you place the lower end of the canvas 

 diict at the top or bottom of the tank? 

 Why? 



\vhat safety features make the type 

 flashlight illustrated below suitable for 

 use on board tank vessels where an or- 

 dinary flashlight might be hazardous? 



690-515 O - 63 



