【正文】 rsity 0714 With twostroke engines, it takes four revolutions to make_____ power stroke(s). A. 1 B. 2 C. 4 D. 8 0715 With uniflow scavenging the ining air enters_____ and leaves at the top. A. at the bottom of the cylinder B. at the lower end of the cylinder C. at the middle of the cylinder D. in the scavenging box Jimei University 0716 With Variable Injection Timing the start of injection may be_____ as the engine load is reduced. A. advanced B. retarded C. kept constant D. none of the above *0717 With V1T the start of injection may be_____ as the engine load is reduced within a certain range. A. advanced B. retarded C. relayed D. cut off 負荷減小 ， 定時提前以維持最大爆發(fā)壓力 Jimei University 0718 With VIT unit the timing of fuel injection of an engine can be regulated automatically according to the_____. A. ship draft B. pitch C. engine load D. oil viscosity *0719 Worn out ring grooves should be_____ to standard dimension after being welded. A. machined B. bored C. honed 油石 磨 D. drilled Jimei University 0720 You increased the_____ to 150 tons that39。s bustion but also the engine39。 (4) suction. The correct sequence is_____. A. (4)(2)(3)(1) B. (4)(3)(1)(2) C. (4)(3)(2)(1) D. (4)(1)(2)(3) Jimei University 0634 There is_____ in any water cooling system for a diesel engine allowing for expansion and water makeup in the system as well as air vent and chemicals addition. A. a setting tank沉淀箱 [池 ] B. a service tank C. a head tank D. an expansion joint膨脹節(jié) , 補償器 Jimei University 0635 There is___ in any water cooling system for a diesel engine allowing for expansion and water makeup in the system as well as air vent and chemicals addition. A. an expansion joint B. a service tank C. a head tank D. a setting tank 0636 There is a_____ system lubricating the running gear and cooling the piston and sometimes lubricating the cylinders. A. recirculating B. total loss C. cooling D. refrigeration Jimei University 0637 There is an injection pump for each cylinder, which is usually operated once every cycle by_____ on the camshaft. A. a gear B. a cam C. a rod D. a roller 0638 There may be steam coils in a cylinder cooling water system. _____ during operation of the engine. A. Steam should be cut off B. Steam should pass through the coils C. Electric should supplied to the coils D. The coils should be dismantled Jimei University *0639 There should be a lubricating oil_____ between the main beatings and the crankshaft. A. film B. cap C. lacquer漆 D. shell 0640 These piston rings are so badly worn that they must be_____. A. renewed B. welded C. machined D. chromiumplated Jimei University 0641 They understand the_____ of automatic sludge discharging of the purifier. But they are not good in practice. A. principle B. principal C. cause D. case *0642 This used piston had been tested and approved as a spare part by the_____ during last annual repair. A. agent B. shipchandler C. surveyor D. engineer Jimei University *0643 Those generally used additives for cooling water are either anticorrosion oils or inanic無機 _____. A. gases B. paints C. inhibitors緩蝕劑 D. detergent 0644 To avoid scavenge fires_____ the engine timing and equipment maintenance should be correctly carried out. A. occurred B. occurring C. not happening D. occur Jimei University 0645 To avoid scavenge fires occurring the engine timing and equipment maintenance_____. A. should be correctly carried out B. should correctly be taken place C. should carded with care D. must to carry out with great care Jimei University *0646 To counteract these undesirable effects cylinder oils usually contain additives formulated to impart a high degree of_____ and detergency. A. salinity鹽度 B. alkalinity ]堿度 C. acid D. sanitary衛(wèi)生的 , Jimei University *0647 To prevent the build up of high stresses engine must not be run continuously_____. A. faster than dead slow speed B. slower than dead slow speed C. with the output of MCR （ Maximum Continuous Ratings ） D. at critical speeds Jimei University *0648 To start the ejection process the oil feed to the centrifuge is first shut off and the oil remaining in the bowl removed by admitting_____. A. flashing water B. operating oil C. flushing water驅(qū)油水 D. sealing water水封水 Jimei University 0649 Turbocharging of marine diesel engine is achieved by two distinct methods, _____ termed the constant pressure and the pulse system. A. respectable B. respectful C. respective D. respectively 0650 Turbocharging system may be designed to operate on either the_____ or the constant pressure exhaust system. A. pulse B. exhaust C. fluctuating D. hunting Jimei University 0651 Twostroke engine turbocharging is achieved by two distinct methods, _____ termed the constant pressure and the pulse system. A. respectable B. respectful C. respective D. respectively *0652 Twostroke engines invariably have_____ to admit air when uncovered by the descending piston. A. inlet ports B. outlet ports C. inlet valves D. exhaust valves Jimei Univ