SPECIMEN EXAMINATION FOR MASTER 



95 



On the drawing of one propeller and state the name 

 shaft of a twin screw vessel as shown, "B," and "C." 



and purpose of "A," 



How is leakage of petroleum or 

 vapors prevented where valve stems 

 must pass through a tank top? 



When zinc, magnesium or iron anodes 

 are fitted on a ship, should they be in- 

 sulated or left in metallic contact with 

 the steel of the hull? Why? 



What strength requirements are put 

 upon a vessel by deep draft? 



What is meant by "floodable length" 

 as applied to a vessel? 



What three (3) strakes usually are 

 the most highly stressed pai-t of the 

 ship's structure because of longitudinal 

 bending moment? 



What are cant frames and where are 

 they used? 



In making alterations or repairs; in 

 assigning tasks in various areas of the 

 vessel ; and in stowing cargo or quarter- 

 ing passengers, what precautions re- 

 quired by the Regulations with respect 

 to means of escape must be borne in 

 mind? 



Illustrated is the standard shipboard 

 cable. What two functions are per- 

 formed by the braided metal armor? 



What are the requirements of the 

 regulations with respect to rails of 

 vessels? 



What are the requirements of the 

 regulations with respect to storm rails 

 on vessels? 



Compare the advantages of closed 

 type chocks to open type chocks. See 

 illustration below. 



closed Type Chock 



Open Tjrpe Chock 



State why preparation of joints is es- 

 sential to butt welds where the strength 

 of the hull structure is involved. 



How are joints prepared for butt 

 welding? 



What provisions are made in the de- 

 sign and construction of pipe lines to 

 allow for thermal expansion? 



COTTON BRAID 



7 





FILLERS 





STRANDED 

 COPPER - 

 CONDUCTORS 



