5-21. A saddle-type gasoline storage tank is actually a combination of how many tanks? 1. One tank and two cofferdams 2. Two tanks and one cofferdam 3. Two tanks and two cofferdams 4. One tank and one cofferdam 5-22. What device connects the outer tank to the draw-off tank? 1. A sluice pipe 2. A diffuser 3. A cross connect 4. The outer tank service riser 5-23. What gasoline tank is the first to be filled and last to be emptied of MOGAS? 1. Outer tank 2. Cofferdam 3. Service tank 4. Draw-off tank 5-24. What is the cofferdam normally filled with for protection? 1. Water 2. Gasoline 3. C O₂ or N₂ 4. JP-5 5-25. When cofferdams are charged with nitrogen, what percentage of inertness must be maintained? 1. 25% 2. 50% 3. 75% 4. 85% 5-26. When cofferdams are charged with carbon dioxide. what percentage of inertness must be maintained? 1. 25% 2. 30% 3. 35% 4. 50% 5-27. The pressure-relief valve in the bypass line of the air escape riser is set at what psi? 1. 1 psi 2. 2 psi 3. 3 psi 4. 4 psi 5-28. When the gasoline storage tanks are 100% full of seawater, what will the differential pressure gage read? 1. 100 2. 2 3. 0 4. 4 5-29. What is unique about the float used in a MOGAS system TLI? 1. It sinks in water 2. It sinks in fuel 3. It does not contain a magnet 5-30. What device ensures back-pressure is maintained on the tanks to force gasoline to the suction side of the gasoline pumps? 1. A priming pump 2. An elevated loop in the overboard discharge line 3. A venturi installed in the discharge line 4. The downsized discharge piping 5-31. What device is designed to break the syphoning effect of the overflow loop? 1. A swing check valve 2. A sight glass 3. A spectacle flange 4. A vent line 5-32. To what pressure is the outer jacket of the double-walled piping pressurized with inert gas? 1. 12 psi 2. 15 psi 3. 3 psi 4. 5 psi 34