102 



UNITED STATES COAST GUARD 



Why are colliers built with wing tanks 

 as illustrated; i.e., why does the inside 

 bulkhead of the tank slope as shown? 

 How is the strength of the vessel af- 

 fected by the inclusion of these tanks in 

 the construction? 



Kim 



Is the wind resistance encountered by 

 a vessel greatest with the wind dead 

 ahead or with wind ahead at an angle 

 oiT the bow? 



Why does a ship require less fuel and 

 why does her speed increase normally 

 when she is in the light condition rather 

 than in the loaded condition? 



What is the maximum amount of 

 acetylene and oxygen a vessel is per- 

 mitted to carry for the purpose of effect- 

 ing her own repairs? 



If a vessel is in level trim but sagging, 

 where would the location of her maxi- 

 mum draft be located? 



If a vessel's bottom has a pronounced 

 sag amidships when she is on a drydock, 

 how is that considered in painting the 

 forward and after draft marks? 



On the ship's length, where are the 

 sheering forces on a ship's structure 

 usually at their maximum? 



Why is it mandatory for safety in oil 

 tanks that such fittings as ladder bolts, 

 heating coil clamps, pipe clamps, etc., be 

 of strong and substantial material in a 

 good state of preservation? 



What is the function of the stern tube 

 gland as illustrated below? 



What procedure is usually followed 

 when a stern tube gland is leaking ex- 

 cessively and requires repacking? 



What type power supply is required 

 for the general alarm system? 



How must fuses in the general alarm 

 system be protected against unau- 

 thorized tampering? 



When compression members of a 

 ship's structure such as longitudinal 

 girders or frames have been badly 

 buckled by collision or other cause, why 

 is cropping out and renewal preferable 

 to fairing in place? 



What ship's plan may be used to de- 

 termine the dimensions, and location of 

 plating? 



Make a rough copy of the sketch be- 

 low and name the plates on it. 



In construction or repair of a ship or 

 her fittings would you regard the 

 fashion plate at "A" or "B" most suit- 

 able? Why? 



Steel plating used for ship construc- 

 tion and repair is commonly referred to 

 by its weight. 



(a) What thickness would 40.8 lb. 

 plate be? 



(b) What thickness would 30.6 lb. 

 plate be? 



What is the difference between a solid 

 floor and an open floor? 



What drainage and venting arrange- 

 ment are made in solid floors? 



What is the function of lightening 

 holes in solid floors? 



How are the tail shafts of vessels 

 protected against corrosion where they 

 pass through the stern tube? 



What tests are given to riveted work? 



How is the length of rivets measured? 



