TheThe distancedistance betweenbetween thethe bottombottom ofof thethe hullhull andand thethe waterlinewaterline isis calledcalled _._. A. tonnage B.reserve buoyancy C. draft D.freeboard ForFor anan uprightupright vessel,vessel, draftdraft isis thethe verticalvertical distancedistance betweenbetween thethe keelkeel andand thethe _._. A. waterline B.freeboard deck C. Plimsoll mark D.amidships section hehe trimtrim ofof a a vesselvessel isis thethe _._. A. value of the mean draft B. degree of list C. amount of roll D. difference in fore and aft drafts TheThe differencedifference betweenbetween thethe starboardstarboard andand portport draftsdrafts causedcaused byby a a transversetransverse shiftshift inin weightweight isis _._. A. list B. heel C. trim 首尾吃水差 D. flotation WhenWhen a a shipship inin loadedloaded conditioncondition floatsfloats atat arbitraryarbitrary waterwater line,line, itsits displacementdisplacement isis toto thethe relevantrelevant massmass ofof waterwater displacedisplace A. equal B. larger C. smaller D. equivalent TheThe displacementdisplacement ofof a a shipship isis toto thethe totaltotal weight,weight, allall told,told, ofof thethe relevantrelevant loadedloaded ship.ship. A. larger B. equal C. smaller D. equivalent IfIf thethe buoyantbuoyant forceforce onon a a shipsships hullhull isis equalequal toto oror greatergreater thanthan thethe displacementdisplacement tonnage,tonnage, thethe shipship willwill _._. A. require ballast added to only the port side tanks B. be down by the head C. sink D. float YouYou maymay improveimprove a a vesselsvessels stabilitystability byby _._. A. keeping the fuel tanks topped off B. increasing the free surface effect C. keeping the fuel tanks at least haft full D. keeping at least one fuel tank empty for slops TheThe stabilitystability ofof a a vesselvessel isis normallynormally thethe greatestgreatest whenwhen allall fuelfuel andand waterwater tankstanks areare fullfull becausebecause thethe _._. A. center of gravity is lowered B. center of buoyancy is lowered C. reserve buoyancy is unchanged D. hull freeboard is increased TheThe depthdepth ofof thethe shipship belowbelow waterlinewaterline measuredmeasured verticallyvertically toto thethe lowestlowest partpart ofof thethe hullhull isis calledcalled . . A. trim B. lean C. draft D. tonnage SomeSome mediummedium andand highhigh speedspeed dieseldiesel enginesengines requirerequire reductionreduction geargear unitsunits toto provideprovide a a usefuluseful propellerpropeller speed.speed. InIn mostmost reductionreduction gears,gears, thethe bullbull geargear . . A. must churn the oil in the sump B. is connected to the propeller shaft C. is driven at the highest rpm D. compensates for alignment variations between the engine and pinion gear WhenWhen usedused withwith reversingreversing reductionreduction gears,gears, medium-speedmedium-speed dieseldiesel enginesengines shouldshould bebe boltedbolted toto theirtheir foundationsfoundations withwith fittedfitted boltsbolts atat thethe drivedrive endend andand clearanceclearance boltsbolts inin otherother locations.locations. ThisThis isis donedone toto . . A. maintain alignment when the ships hull is working in heavy seas B. ensure engine vibrations correspond to the natural frequency of the hull C. permit the engine to expand away from the driven equipment as the engine heats up and expands D. maintain engine thrust bearing clearances WhatWhat determinesdetermines thethe numbernumber ofof eventsevents occurringoccurring inin a a cyclecycle ofof operationoperation inin anan internalinternal combustioncombustion engine?engine? A. Crankshaft revolution. B. Type of engine . C. Distance a piston travels during a stroke. D. Number of pistons. GasGas turbinesturbines differdiffer fromfrom steamsteam enginesengines inin thatthat _._. A. steam rather than gas is used to turn a shaft B. vapor rather than gas is used to turn a shaft C. the former uses gas to turn a shaft D. the latter uses gas to turn a shaft TheThe mainmain operatingoperating characteristiccharacteristic ofof dieseldiesel enginesengines whichwhich distinguishesdistinguishes themthem fromfrom otherother internalinternal combustioncombustion enginesengines isis thethe . . A. method of supplying air B. cooling system C. method of igniting fuel D. valve operating mechanism WhichWhich ofof thethe followingfollowing reasonsreasons representsrepresents whywhy thethe designeddesigned compressioncompression ratioratio ofof a a gasolinegasoline engineengine isis lowerlower thanthan thatthat ofo