【正文】 D. turned out 0290 In some designs the cylinder oil is timed so that the oil injects only on the_____. A. piston crown B. piston groove C. piston skirt D. piston ring belt Jimei University 0291 In the_____ pressure charging system the pulse of energy that occur as the exhaust is released from the cylinder to improve the output of the turbocharger. A. constant B. pulse C. high D. none of the above 0292 In the event of the cylinder starting valve leakage_____ would pass into the air pipes and ignite the oil deposited. A. cooling water B. vapor from the boiler C. starting air D. hot gases Jimei University 0293 In the fourstroke engine, it takes_____ to make one power stroke. A. one propulsion B. two propulsions C. two revolutions D. one revolution 0294 In the part of the cylinder liner inside the scavenging air box there is a series of openings known as_____. A. scavenging air ports B. exhaust ports C. fuel valves D. indicator cocks Jimei University 0295 In the sentence In some designs the cylinder oil is timed so that the oil injects only on the piston ring belt., the piston ring belt means_____. A. piston crown B. piston ring groove C. piston skirt D. piston ring area 0296 In the suction stroke air is induced into the cylinder_____. In the pression stroke the air is pressed. A. by an fuel valve B. through an inlet valve C. with an exhaust valve D. from an outlet valve Jimei University 0297 In the twostroke engine, each revolution of_____ makes one power or working stroke. A. the turning gear B. the turbocharger C. the crankshaft D. the pressor *0298 In the twostroke engine, inefficient scavenging and other losses reduce_____ to about . A. the output B. the oil flow C. the diameter D. the power advantage Jimei University 0299 In today39。 remain是不及物動(dòng)詞 ，retain是及物動(dòng)詞 ， 少了賓語所以不選 。 *用壓鉛絲法調(diào)整 、 測量間隙時(shí) ， 鉛絲的厚度應(yīng)比正常的允許間隙大 ， 但一般不大于該值的兩倍 。 (2) low pression pressure。 本句 it也是代替不定式。主語從句中 should是可以省略的 ， 所以優(yōu)先選省略的 。 more fuel may now be burned giving an increased power. A. specific volume比容 B. density C. viscosity D. calorific value熱值 0302 Increasing differential pressure of an oil filter indicates that_____. A. it is dirty B. it is leaky C. it has been renewed D. all the above Jimei University 0303 Increasing the temperature of a fuel will reduce its_____. A. viscosity B. pressure C. resistance D. setting point著火點(diǎn) 0304 It is abnormal that when the engine is being turned by the turning gear or by hand, _____. A. water discharges from the indicator cocks B. no water is leaking into crankcase C. no water in the scavenge belt D. the rpm is lower than the speed of Dead Slow Ahead Jimei University 0305 It is important that the two condensate drain cocks, fitted to the underside of the air chest, _____ until the engine is placed on full load. A. remain open B. remain close C. retain open D. retain close * 發(fā)動(dòng)機(jī)啟動(dòng)時(shí) ， 凝水放殘考克應(yīng)保持在 打開狀態(tài) ， 直到發(fā)動(dòng)機(jī)全負(fù)荷運(yùn)行 。W, 2stroke cycle, single acting direct reversible, crosshead, welding design type diesel engine with turbocharge, these information refers to_____. A. the type of a pump B. the type of a turbocharge C. the type of an accessory equipment D. the type of a main engine Jimei University 0233 If we wanted to increase the output further, the main engine_____. A. would be overload B. would be overloaded C. must overload D. is overloaded 0234 If_____ are taken at regular intervals, any unequal distribution of load will be easily found out. A. differential of crankwebs B. indicator diagrams C. lube oil reading out D. misalignment of crankthrows Jimei University *0235 If a cylinder is not firing_____. A. its exhaust temperature will be low B. the temperature at its cooling water outlet will be high C. neither A nor B D. both A and B 0236 If a kind of liquid is used to cool the diesel engine, it is invariably called_____. A. Lubricant B. coolant C. bustion product D. second refrigerant Jimei University 0237 If an auxiliary diesel engine does not shut off, the trouble may be_____. A. leaky fuel injectors B. low firing pressure C. high firing pressure D. seizure of pistons 0238 If an auxiliary diesel engine stalls frequently, the main cause may be_____. A. faulty fuel injection equipment B. excessive crankshaft clearance C. an incorrectly assembled governor idle spring D. high exhaust back pressure from one cylinder Jimei University *0239 If black smoke is ing from the exhaust stack排氣煙囪 ,排煙管 of a diesel engine, what could be the trouble? A. bad exhaust valves B. not enough air C. leaking fuel injecting D. all of the above 0240 If diesel oil in this tank is used, the_____ of the oil must not exceed 120 degree F. A. viscosity B. flash point閃點(diǎn) C. acid value D. temperature Jimei University *0241 If some of the cylinders are not firing, the_____ affected may be determined by watching exhaust temperature. A. that B. those C. ones D. meter 0242 If some of the cylinders are not firing, the ones affected may be determined by watching _____.(同 0241) A. the exhaust temperature B. the exhaust pressure C. the governor