eto英语考证练习题

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1、第一章船舶主推进装置第一节船舶动力装置概述001____areincreasinglyusedasmainengineonmerchantvessel,becausetheyhaveahighHp/Weightratio.A.SlowspeeddieselenginesB.Medium-speeddieselenginesC.SteamenginesD.Gasolineengines002Propulsionofthevastmajorityofcontemporarymerchantships(especiallycontain

2、ershipsandVLCCs)utilizes____asprimemover.A.gasturbineB.dieselengineC.steamengineD.gasolineengine003Typicalmarinepropulsionplantsinclude____directlycoupledtothevessel’ssinglelarge-diameterpropellershafting.A.asingle,long-stroke,slow-speed,turbocharged,two-strokediesele

3、ngineB.asingle,long-stroke,medium-speed,turbocharged,four-strokedieselengineC.twomedium-speed,turbocharged,four-strokedieselengineD.avariable-speedACgenerator004With____,theengineneednottobealignedwithreductiongearsorpropellershaft.A.DieselenginepropulsionB.Dieselelec

4、tricpropulsionC.SteamenginepropulsionD.Gasturbinepropulsion005Intoday’spractice,withcylindersofequaldiameterofboreandequalrevolutionsthetwo-cycleenginedeliversapowerabout80percent____thanthatofthefour-strokeone.A.greaterB.betterC.smallerD.less006_____canbefoundonmostm

5、ediumtolargemerchantvesselsevenifthemainengineiseitherasteamturbineora2-stokecrossheadengine.A.Themediumspeed4-stroketrunkpistonengineB.Thelowspeed2-strokecrossheadengineC.Themediumspeed2-strokecrossheadengineD.Thelowspeed4-strokepistonengine007_____allowstheenginesto

6、beplacedwhereverismostsuitable,astheynolongerhavetobealignedwithreductiongearingandshaftingasisthecasewithconventionalinstallations.A.DieselenginepropulsionB.DieselelectricpropulsionC.SteamenginepropulsionD.Gasturbinepropulsion008Adieselenginewhichisratedfornormaloper

7、ationatacrankshaftspeedof800RPM,iscommonlyclassedasa______.A.slow-speeddieselB.medium-speeddiesel-57-C.high-speeddieselD.constant-speeddiesel009Whichofthefactorslistedhasthegreatesteffectonthemechanicalefficiencyofadieselengine?A.temperatureoftheintakeairB.frictionwit

8、hintheengineC.mechanicalconditionofthesuperchargerD.mechanicalconditionoftheturbocharger010Whatdeterminesthenumberofeventsoc