【正文】 編號 問題 選擇A 選擇B 選擇C 選擇D 答案 注解 1 On a large diesel engine installation, crankshaft axial alignment is maintained by the ________. piston rod guides engine thrust bearing crosshead bearing main shaft flexible coupling B 在大型柴油機安裝中，曲軸靠推力軸承保持軸向?qū)χ小? 2 A diesel engine which is rated for normal operation at a crankshaft speed of 800 rpm, is monly classed as a ________. slowspeed diesel mediumspeed diesel highspeed diesel constantspeed diesel B 曲軸轉(zhuǎn)速800轉(zhuǎn)／分以額定功率正常運行的柴油機稱 為中速柴油機。 3 Which of the following statements is correct concerning available astern power for diesel main propulsion systems? Astern power is to be provided in a sufficient amount to secure proper control of the ship in all normal circumstances. The astern power of the main propelling machinery is to provide for continuous operation astern at 60% of the ahead rpm at rated speed. For main propulsion systems without reversing gears, controllable pitch propellers or electric propulsion drive, running astern is not to lead to overload conditions. Astern power available will be equal to ahead power when controllable pitch propellers are utilized, thus discounting the need for increased operating parameters. A 倒車功率必須能提供足夠的功率確保在各種正常情況下能夠?qū)Υ斑M行適當?shù)目刂啤? 4 When two medium speed diesel engines coupled in parallel to a mon propeller shaft that operates at the same speed as the engines, which of the operating conditions listed will apply? Full horsepower is available ahead and astern. One engine must be running ahead and the other astern. Full reversing torque is not available. Mechanical reduction gearing is required. D 當兩臺中速柴油機并排連接到同速運轉(zhuǎn)的普通螺旋槳軸上，需要機械減速裝。 5 Which of the listed design features is most mon to a twostroke/cycle lowspeed main propulsion diesel engine? Crosshead construction. Crossscavenging air flow. Trunk type pistons. Single reduction gearing. A 低速二沖程主推進柴油機普遍采用十字頭結(jié)構(gòu)。 6 A disadvantage of a twostroke/cycle diesel engine is ________. more power strokes per revolution the use of scavenge air more plicated valve gear higher working temperatures of the piston and cylinder D 二沖程柴油機的缺點是氣缸頭的溫度高。 7 In paring engines of equal horsepower, higher exhaust gas temperatures occur in a/an ________. opposedpiston engine doubleacting engine twostroke/cycle engine fourstroke/cycle engine D 與相同馬力的柴油機相比，四沖程柴油機的廢氣溫度高。 8 The double bottom in a vessel is a space prised of ________. plating forming the engine room tank top double plating installed over the flat keel plate a watertight boundary formed by the inner bottom partments between the inner and outer bottoms D 船的雙底殼是由內(nèi)外兩層構(gòu)成的。 9 A water jacket is placed around the exhaust manifolds of propulsion diesel engines to ________. reduce heat radiation to the engine room aid in preventing turbocharger overheating condense and drain moisture from exhaust gases dampen exhaust gas pulsations in the manifold A 環(huán)繞排氣總管的水套是為了減少對機艙的熱輻射。 10 Which of the listed types of staring systems is often used on large, low speed, direct reversing, main propulsion diesel engines? Electric. Hydraulic. Air. All of the above. C 大型低速可逆轉(zhuǎn)主推進柴油機使用空氣起動系統(tǒng)。 11 The overspeed trip installed on most diesel engine will stop the engine by shutting off the ________. water supply fuel oil supply lube oil supply exhaust damper B 大多數(shù)柴油機安裝的超速保護（停車）裝置通過切斷燃油供油使發(fā)動機停車。 12 In a mon rail system, excessive pressure in the header may be caused by ________. improper adjustment of the bypass valve a dribble in the fuel injection nozzle insufficient leakoff through injection nozzle packing a malfunctioning injection nozzle A 在共軌燃油噴射系統(tǒng)中,集油管壓力過大可能是由于旁通閥調(diào)節(jié)不當而造成的。 13 Diesel engine electric starting motors generally require heavier duty motors and operaste at higher voltages than parable starting motors for gasoline engines due to ________. higher speed required flywheeleffect lower starting temperatures higher pression pressures D 因為要更高的壓縮壓力，柴油機電起動馬達與類似的汽油機的起動馬達相比，要有更大的功率和更高的電壓。 14 When used with reversing reduction gears, mediumspeed diesel engines should be bolted to their foundations with fitted bolts at the drive end and clearance (loosely fitted) bolts in other locations. This is done to ________. maintain alignment when the ship’s hull is working in heavy seas ensure engine vibrations correspond to the natural frequency of the hull permit the engine to expand away from the driven equipment as the engine heats up and expands maintain engine thrust bearing clearances C 當與倒車減速裝置一起使用時，中速柴油機應該在傳動端用裝配螺栓與底座連在一起，而在其它地方則用間隙螺栓固定，這樣可使柴油機熱膨脹時留有膨脹余地。 15 A diesel engine with a bustion chamber located between the crowns of two pistons is known as a / an ________. doubleacting engine opposed pistons engine singleacting engine horizontal acting engine B 柴油機的燃燒室介于兩個活塞之間，這種發(fā)動機稱為“對置活塞式柴油機”。 16 In using reduction gears to obtain efficient propeller speeds, ________. they must be located at the after end of the engine they can only be used with one engine at a time they eliminate the need for controllable pitch propellers they are connected to the engine with a flexible coupling D 減速齒輪與發(fā)動機采用柔性聯(lián)軸節(jié)連接。17 For a given size engine, the twostroke / cycle diesel engine will deliver more power than a fourstroke / cycle diesel engine because ________. it has a longer power stroke more air gets into the cylinder each stroke it develops twice as many power strokes at the same speed higher bustion pressure is developed C 理論上，二沖程柴油機發(fā)出的功率是相同四沖程柴油機的兩倍。18 The minimum speed an engine must attain before ignition can occur depends upon ________. the type and size of the engine the condition of the engine ambient temperature all of the above D 發(fā)動機發(fā)火之前必須獲得的最低轉(zhuǎn)速取決于發(fā)動機的類型和尺寸、發(fā)動機的狀態(tài)和環(huán)境溫度等因素。19 In a diesel engine, internal bustion causes the piston to be moved by ________. the simple admission of fuel and air into the bustion space only the pressure of gases developed specially designed parts connected to a shaft the concept of reciprocity B 在柴油機工作時，內(nèi)部燃燒引起活塞被燃氣壓力驅(qū)動。20 Diesel engines a