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- 桨叶上同一半径截面上的局部螺距的算术平均值称为该截面的()螺距。Excessive alkalinity of the water in an auxiliary boiler can cause ().总
截面#
平均
桨叶caustic embrittlement of the boiler metal#
aci
- 体现主机紧急倒车性能的指标是()。船轴不包括()。船舶由全速前进变为倒航所需的时间
船舶由全速前进变为船速为零所需滑行的距离
主机由全速前进转速降为转速为零所需的时间
A或B#推力轴
中间轴
艉轴
曲轴#
- 备车时间的长短,各类船舶有所不同,一般在()h。There should be a lubricating oil () between the main beatings and the crankshaft.0.5—6#
1—2
2—3
1—5film#
cap
lacquer
shell
- 强化气缸套内圆表面的方法主要有()等工艺,使表面耐磨性、抗咬合性提高来防止拉缸事故。Ⅰ.松孔镀铬;Ⅱ.镀铁;Ⅲ.离子氮化;Ⅳ.硬质镀铬;Ⅴ.喷钼。Operating conditions in the crank chamber are very () those in
- 主机起动用的空气瓶至少应有2个,在进行起动次数试验时,应()。增压器的转子是在拆下()以后,从()端抽出来的。开启1个空气瓶,并起动空压机补气
开启2个空气瓶,并起动空压机补气
开启1个空气瓶,不可补充空气#
开启
- The sequence of parts in a generally used fuel oil supply system for a main engine is ()(1)tanks in the double bottom(2)centrifuges(3)service tank(4)settling tank(5)viscosity regulatorVents are led
- A ()is the foundation of the engine, without the support of which the shaft alignment in particular, and engine structure as a whole, would inevitably be lost.A restricted air intake to a diesel e
- 常用的船舶防污染设备有()。() in what position the engine stops there will always be at least one of the cylinders with its starting air valve open to admit compressed air to start the engine.油水
- 备车和机动操纵对柴油机动力装置的()直接影响。Ⅰ.可靠性;Ⅱ.经济性;Ⅲ.维修性;Ⅳ.使用寿命;Ⅴ.操纵技能Before replacing a piston you should check the rings to see that all clearances and gaps are () the
- After passing through the turbine the exhaust gas is conducted out into the().Which of the following firing order may be used for an 6 cylinder engine?()intercooler
compressor
cylinder
open air#1-
- 修复后气阀装入阀座与锥面接触面积不得少于原接触面积的()。舵系振动的原因可能是()。1/2
1/3#
1/4
2/3舵承间隙过小
舵承间隙过大#
舵杆变形
舵杆折断
- 现代柴油机排烟温度下降,不利于废气锅炉的余热利用,因此规定废气锅炉设计的标定工况是:废气锅炉排气进口温度t1为()℃,出口温度t2为()℃。在船上,拆下来的增压器转子应该用()浸泡清洗。400/300
300/200
255/188#
- 按直线校中原理校中时,各轴承的连线为()。四冲程柴油机停增压器运转产生的主要问题是()。直线#
曲线
折线
不一定无法换气
排气倒流#
振动强烈
喘振
- 针阀体的喷孔磨损后使孔径增大()时需要换新针阀体。铁梨木艉轴承的主要损坏形式有()。10%#
20%
30%
40%腐蚀、裂纹
过度磨损、裂纹#
腐蚀、过度磨损
烧熔、磨损、腐蚀
- 当铁梨木艉轴承的轴承间隙超过极限间隙,但铁梨木板条的厚度仍在要求范围以内时,可采用()方法修理。Ⅰ.更换艉轴;Ⅱ.更换艉轴铜套;Ⅲ.在艉轴承下瓦下面垫入整张铜皮;Ⅳ.更换艉轴承衬套;Ⅴ.在艉轴承下瓦上面垫入整张铜
- 甲板机械是为保证()的机械设备。从液压拉伸器的结构上看,当活塞的升程超过了其“最大升程”时,会出现()现象。船舶航行、停泊
装卸货物及起落重物
船舶稳性
A+B#活塞顶部泄放旋塞漏油
活塞上部与油缸的密封处漏油
- 气缸盖底面在较高的()等的恶劣条件下工作。Ⅰ.交变的机械负荷;Ⅱ.热负荷;Ⅲ.燃气腐蚀阀、孔;Ⅳ.冲刷;Ⅴ.冲击。For one or two types of engine,the piston and rod can be withdrawn downwards from the cylinder i
- For an ordinary four-stroke diesel engine the exhaust valves close ().The process to remove exhaust gases by blowing in fresh air is called ().after TDC#
before TDC
after BDC
before BDCcharging
su
- 在水平平面内,当曲柄的两个主轴承位置偏右,曲轴轴线呈右弧线弯曲(即呈“)”形)时,该曲柄的臂距差Δ-为()值。某曲柄的两主轴承在水平平面内位置偏右,曲轴轴线呈右拱形,则其Δ-()。正#
负
零
正或零>0#
<0
=0
不
- Among the rings of a piston the () one is subjected to the greatest load and temperature.The () or balance tank collects the re-circulated fuel oil.bottom
middle
top#
none of the abovebuffer#
sump
- 贮备可以提高可靠性,它和其他提高可靠性方法的原则区别,在于可使系统的可靠性()部件本身的可靠性。The diameter of the gravity disc is too big It causes oil to flow through the water outlet We changed the