SPECIMEN EXAMINATION FOR SECOND MATE 



57 



If a ship drydocks while carrying re- 

 frigerated cargo, what steps must be 

 taken if the refrigerating plant must be 

 operated? 



A vessel has two similar reefer 

 spaces, one holding apples with a spe- 

 cific heat of .90, the other holding 

 smoked bacon with a specific heat of 

 .50. Both boxes are kept at 35° F. If 

 the refrigeration machinery is shut 

 down, which box will lose its tempera- 

 ture most rapidly? Which will require 

 the longer time to cool down from a tem- 

 perature of 70° F., using the same ma- 

 chinery and the same power? 



Name at least two types of refriger- 

 ant gases used on merchant vessels and 

 describe the hazards that they can 

 create. 



State the purpose of gratings in re- 

 frigerated compartments and describe 

 in detail how you lay them. 



Would you use the gratings for stow- 

 age of high density cargo of a general 

 nature in a refrigerated compartment 

 which is thoroughly insulated? 



Show (by means of a sketch if de- 

 sired) how you would determine the 



maximum length of steel pipe that 

 could be loaded. 



A vessel loads 2000 tons of cargo 

 using ten gangs of longshoremen, ten 

 hours each : 



(a) What is the rate of loading 

 per gang hour? 



(b) If each of the above gangs is 

 composed of 15 men, what is the rate in 

 tons per man hour? 



Why should insufficiency of packing 

 or use of poor packaging material be 

 noted on an exception report? 



When inflammable liquids are stowed 

 on the deck of a vessel, what precau- 

 tions are mandatory in order that fire- 

 fighting equipment is immediately at 

 hand? 



What precautionary measure is usual 

 on merchant vessels to warn longshore- 

 men or other workmen against using the 

 ship's booms to lift weights in excess of 

 their safe working load? 



In loading ore would you permit each 

 hold to take its full complement before 

 the others are started? 



How is the stowage factor for a com- 

 modity determined from the measure- 

 ment and weight? 



27. DETERMINATION OF AREA AND VOLUME. 



Find the volume of a cone 30 feet in 

 height, whose base is 40 feet in diam- 

 eter. 



A hold is 25 feet wide and 12 feet 

 deep. If you stow 165 tons of cargo 

 against the forward bulkhead, how far 

 aft will it extend, allowing 45 cubic feet 

 to a ton ? 



The diameter of a smokestack is 10 

 feet and its height 40 feet. 



(a) What is its surface area in 

 square yards? 



(b) Find how much it would cost 



to give it one coat of paint if 1 gallon 

 of mixed paint costs 3 dollars and covers 

 70 square yards. 



Find the number of square yards of 

 canvas required to make a trysail, the 

 luff being 40 feet, the foot 30 feet. The 

 foot is at right angles to the luff. How 

 much would the canvas cost at 37 cents 

 per linear yard, the width of sail canvas 

 beinor 2 feet? 



A rectangular plate is 24 feet 6 inches 

 long and 8 feet 9 inches wide. What is 

 the area of the plate? 



28. LIFESAVING APPARATUS AND FIREFIGHTING EQUIPMENT. 



Describe the stowage of the water 

 which is required to be carried in life- 

 boats on ocean and coastwise passenger 

 vessels. 



May a lifeboat which is certified to 

 carry 65 persons be fitted with an ap- 

 proved type of hand propelling gear? 



How often are drills with the line- 

 throwing appliance required to be held 

 aboard ocean passenger vessels? 



How often must fire and boat drills 

 beheld? 



Describe the method of firing the 

 mounted line-carrying gun. 



Adrift in a motor lifeboat from an 

 ocean passenger vessel, what equipment 

 could you utilize to signal or attract an 

 airplane or vessel? 



How should lifeboat chocks on pas- 

 senger vessels be fitted in order to fa- 

 cilitate the launching of the boats? 



How often must fire and boat drills 

 be held aboard ocean passenger vessels? 



690-515 O - 63 



