SPECIMEN EXAMINATION FOR MASTER 



93 



Sketched below are various arrange- 

 ments of the shell plating on the frames 

 employed in ship's construction. 



(a) Name the arrangements. 



(b) Which arrangement is used 

 most often in modern ship building? 



(c) Why? 



What is the usual method used to 

 distinguish the strakes and plates of a 

 ship? 



How is worn or corroded plating 

 checked for thickness? 



The type stress being exerted on the 

 rivet shown is known as 



4. I. 



J) D 



What is the meaning of the term 

 "sheer of a vessel" as applied to deter- 

 mination of a ship's load line? 



How is the quality of steel regulated 

 for use in the construction of merchant 

 vessels? 



Why is the flat keel plate normally 

 the heaviest plate on a vessel's bottom? 



What is the eflFect of rectangular 

 openings such as hatches on deck 

 stresses? Why should such areas be 

 checked carefully by deck officers fol- 

 lowing heavy weather? 



On passenger vessels, in what di- 

 rection must the doors of public spaces, 

 corridors, stairway enclosures, etc. 

 open? 



Why are certain longitudinal seams 

 riveted on vessels which would other- 

 wise be all welded in construction? 



Why are most modem welded vessels 

 built with flush butts and seams? 



Name valves "A," "B," "C," and "D" 

 and briefly state the purpose of each. 



What precautions to detect leakage 

 of steam coils should be taken when it 

 is necessary to heat a liquid cargo in 

 order to reduce its viscosity at dis- 

 charge? What dangers could arise from 

 coil leakage? 



What is the maximum vapor pressure 

 permitted on a tank, unless that tank 

 has been constructed as an unfired pres- 

 sure vessel? 



What is the purpose of pressure- 

 vacuum relief valves? 



In dry docking a vessel, what pre- 

 cautions are usually taken to insure that 

 the keel plate is properly painted in the 

 way of the keel blocks? 



Is the longitudinal center girder of 

 a vessel's keel structure or are the floors 

 normally built intercostal? Why? 



Why is the longitudinal center girder 

 of a vessel's keel structure usually built 

 solid when fuel oil or water is carried 

 in the double bottom? 



690-515 O - 63 - 8 



