SPECIMEN EXAMINATION FOR MASTER 



103 



When passenger vessels are fitted 

 with hinged watertight doors in the 

 cargo spaces, what precautions are re- 

 quired by the regulations? 



What advantage is gained by the use 

 of a balanced rudder? 



What is a stealer strake? State why 

 it is necessary. 



What is meant by the pitch of a 

 rivet? 



Describe how the propeller of a vessel 

 is removed for repair or renewal. 



Why are louvers or small screened 

 openings desirable in bulkheads or doors 

 between a passageway and a room for 

 passengers or crew members? 



Why must a vessel's stern tube be of 

 sturdy construction ? 



What report is necessary when re- 

 pairs or alterations alTecting the safety 

 of the vessel are to be made? 



What is the difference between a 

 "built-up" and a "solid" propeller? 



What members of the ship's structure 

 resist buckling of the plating when the 

 vessel's plating is in compression? 



In loading concentrated heavy 

 weights, such as lead or pig iron billets 

 in a vessel's 'tween decks, where would 

 the decks load bearing capacity be 

 greatest, i.e., could more weight be car- 

 ried adjacent to shell and bulkheads or 

 near hatch openings without danger of 

 setting down the decks? 



What is the purpose of the expansion 

 joint fitted on the superstructure of 

 some vessels? 



Why must the deck plating above 

 tanks be capable of withstanding forces 

 acting upward as well as down? 



How do you determine the thickness 

 of plating, sizes of beams, g^irders, etc., 

 that may be used in constructing or re- 

 pairing a vessel? 



Where is zinc or magnesium anode 

 protection most useful on the outer hull 

 of vessels? Why? 



In addition to the compartmentation 

 and the watertight division which bulk- 

 heads afford, what strength elements do 

 they give the vessel? 



Are vessels designed to withstand ab- 

 normally severe stresses which may be 

 set up by poor distribution of weight? 



When passenger vessels are fitted 

 with portholes below the bulkhead deck, 

 what method is prescribed by the 

 Regulations to prevent their being 

 opened by unauthorized persons? 



How are drain wells for holds con- 

 structed in order that damage to the 

 outer bottom on a vessel fitted with a 

 double bottom will not cause water to 

 be admitted into the cargo spaces? 



When sounding pipes terminate be- 

 low the freeboard or bulkhead deck, 

 what provisions are required to prevent 

 flooding of the compartment in which 

 the sounding pipe terminates, should 

 there be a head on the double bottom 

 tank? 



What provision is usually made to 

 prevent damage to a vessel's shell plat- 

 ing where the sounding rods strike? 



Where breaks in the continuity of a 

 vessel's shell structure are created by 

 sideports, gangway apertures, etc., what 

 structural compensations are made? 



Why is it, in general, the procedure 

 to weld butts before seams in the repair 

 or construction of vessels with electric 

 welding? 



What protection must be afforded 

 double bottom tanks against pressures 

 in excess of that for which they are de- 

 signed? 



What is the dead rise of a vessel? 



What are garboard strakes? 



What protection must be afforded 

 manholes to double bottoms? 



What are intercostals? 



What are margin plates? 



Why are hinge pins usually made 

 with a loose fit or an elongated hole 

 made for the hinge bolt or pin on hinged 

 watertight doors and portholes? 



Describe how you would check a 

 hinged watertight door for tightness, 

 and state the adjustments that may be 

 made if necessary under operating con- 

 ditions at sea. 



Why are the bulkhead stiffeners of 

 freight vessels normally vertical while 

 those of tank vessels are horizontal? 



How are bulkheads in cargo holds 

 tested for watertightness? 



How are galleys, living quarters, navi- 

 gation spaces, general cargo, boiler 

 rooms, and enclosed spaces containing 

 machinery, where sources of vapor igni- 

 tion are normally present, segregated 

 from cargo spaces carrying grades "A," 

 "B,""C," or "D" liquids? 



Why does the plating of a bulkhead as 

 well as its stiffeners decrease in size 

 and strength from the lower to the 

 upper part? 



Why must shaft alleys be of water- 

 tight construction? 



Where double bottom tanks are filled 

 with fuel or water, how could you check 

 suspected bottom damage that may have 

 opened the outer bottom to the sea? 



In the event of damage to a vessel's 

 bow and flooding of the forepeak, what 

 factors would influence the amount of 

 water pressure on the collision bulk- 

 head? 



