SPECIMEN EXAMINATION FOR MASTER 



91 



What is meant by ceiling of a hold? 



What are limber holes? 



What are lightening holes? 



What provisions are necessary for 

 the local increase in stress on a deck at 

 hatch corners and other openings? 



Why are the center girders, side keel- 

 sons, or other internals of a similar 

 type welded by intermittent welds as 

 sketched, rather than continuous welds 

 when they are not required to be oil 

 or watertight? 



What causes slight "ripples" be- 

 tween floors characteristic of the bot- 

 toms of welded vessels? 



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Referring to the sketch : 



(a) With a vessel in loaded condi- 

 tion and level trim, use the floodable 

 length curve corresponding to this con- 

 dition and determine if the vessel will 

 sink when No. 1 and No. 2 holds are 

 flooded if their permeability is esti- 

 mated to be 63 percent. 



(b) Discuss briefly the effect of the 

 trim by the head or stern, lighter dis- 

 placement, and variation from given 

 permeability when using the curve. 



Referring to the sketch : 



(a) Why are the fairwater plates 

 for the rudder made portable? 



(b) What materials are usually 

 employed for rudder gudgeon bushings? 



PI»E PLU6S 



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KRKR M.ATC. 



