In a diesel engine, exhaust valves open before the intake ports are uncovered to （） Ⅰ.reduce pumping losses Ⅱ.reduce back pressure -题库考试答案搜索网

In a diesel engine, exhaust valves open before the intake ports are uncovered to （）
Ⅰ.reduce pumping losses
Ⅱ.reduce back pressure

单选题

2022-08-11 00:29

A、Ⅰonly
B、Ⅱonly
C、bothⅠand Ⅱ
D、neitherⅠnor Ⅱ

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正确答案

C

试题解析

标签：船舶电气与船舶安全

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相关题目: 为了保证船舶航行安全，首先要确定船舶的航向与位置。船舶定位方法按照参照目标可分为（　）。; 下列关于船舶安全检查的说法中，正确的是（）。
Ⅰ、船舶接受安全检查时，陪同检查的船员引导检查人员即可
Ⅱ、船舶接受安全检查时，陪同检查的船员应按检查人员要求，调试、操纵有关设备
Ⅲ、中国籍船舶接受安全检查时出示船舶安全检查记录簿; How would the exhaust of a properly operating diesel engine appear?（）.; One remedy for a high firing pressure, in addition to a high exhaust temperature in one cylinder of a diesel engine, is to （）; If a single cylinder relief valve on a diesel engine lists frequently while the engine is running, the cause may be an （）; Which of the listed conditions will occur if a diesel engine exhaust valve is leaking?（）; Any increase in the exhaust back pressure of a four-stroke/cycle diesel engine will （）.; White smoke exhausting from a diesel engine can result from （）; A diesel engine emits blue exhaust smoke as a result of（）; Worn main bearings in a diesel engine can result in （）; If the firing pressures in a diesel engine are high, although the exhaust temperatures are normal, the cause may be（）; In a turbocharged four-stroke/cycle diesel engine, the exhaust valve remains open until after top dead center and the intake valve opens before top dead center to（）.; The exhaust valve opens before bottom dead center in a four stroke engine to（）
Ⅰ.allow for blow down
Ⅱ.Reduce pumping losses; If the engine is naturally aspirated, or is a small high-speed type with a centrifugal turbocharger, the period of valve overlap（）,ie when both valves are（）, will be and the exhaust valve will close some 10°top dead canter（）.; Broken intake valve springs on one cylinder of a diesel engine can cause the engine to （）; Excessively worn, or polished ends on a diesel engine valve spring, indicate（）; For a diesel engine, individual cylinder performance is commonly determined by exhaust gas（）; Which of the following gases represents the greatest threat to personnel safety in an engine room where the exhaust is leaking from a diesel engine?（）; A built-up exhaust valve is one in which （）.; A diesel engine experiences a sudden loss in speed, accompanied by black exhaust smoke, with the fuel rack at maximum, and speed remaining below normal the probable（）

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