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1.An increased differential between the inlet and outlet of a strainer usually indicates the strainer is .
单选题A. holed~||~fouled~||~clean~||~dry
2.The fuel injection system is very important, so any trouble of it will _____ the operation of the main engine.
单选题A. beaffected~||~affect~||~beeffected~||~effect
3.关于UG8表盘式液压调速器的速度设定机构说法正确的是()。
单选题A. 调速电机通过调速旋钮设定转速~||~调速电机轴与调速齿轮弹性连接~||~调速旋钮与调速齿轮弹性连接~||~顺时针转动调速旋钮设定转速降低
4.水管锅炉比烟管锅炉效率高是因为_________热损失小。
单选题A. 散热~||~排烟~||~机械不完全燃烧~||~化学不完全燃烧
5.造成分油机出水口跑油的原因是()。
单选题A. 分油温度过高~||~水封水阀关闭不严~||~排渣间隔时间短~||~用重油分油机分轻油没调整重力环
6.迪拉瓦自动排渣分油机的控制阀表盘上标有"1、2、3、4"四个位置,分别表示()。
单选题A. 开启空位密封补偿~||~密封补偿开启空位~||~空位密封补偿开启~||~补偿开启空位密封
7.测定锅炉锅水含盐量常用_________。
单选题A. 称重法~||~盐度计~||~化验Cl-浓度~||~测比重法
8.锅炉转杯式喷油器所带风机的供风起_________作用。
单选题A. 雾化燃油~||~防止油高温缺氧产生炭黑~||~供应燃烧所需大部分空气~||~A和B
9.During repair, lubrication lines and orifices must be _____.
单选题A. takenaway~||~engaged~||~connected~||~sealedoff
10.海船建造规范规定,锅炉外表面温度不应大于_________℃。
单选题A. 50~||~60~||~70~||~80
11.In motorships,there are two main circuits, _____.
单选题A. onesaltwater,onefreshwater~||~onesaltwater,onefuel~||~onefreshwater,onefuel~||~onesteam,onefuel
12.喷射泵的混合室通常是________。
单选题A. 圆柱形~||~收缩的圆锥形~||~扩张的圆锥形~||~A或B和A
13.分油机异常振动的原因有()。Ⅰ.轴承过度磨损使立轴下沉Ⅱ.摩擦片数量不足Ⅲ.分离筒盖没锁紧Ⅳ.传动齿轮损坏Ⅴ.摩擦片装反Ⅵ.摩擦离合器过度磨损
单选题A. Ⅰ+Ⅱ+Ⅲ+Ⅳ~||~Ⅲ+Ⅳ+Ⅴ~||~Ⅰ+Ⅲ+Ⅳ+Ⅵ~||~Ⅰ+Ⅲ+Ⅳ+Ⅴ+Ⅵ
14.四冲程增压机气阀重叠角一般为()。
单选题A. 25°~50°~||~15°~20°~||~50°~70°~||~80°~130°
15.Generally speaking, suction heads require to be _____ for high speed or large capacities than for low speed or small capacities.
单选题A. greater~||~smaller~||~better~||~worse
16.关于锅炉酸洗,下列说法正确的是_________。
单选题A. 酸洗过程中锅炉应周期性地点火加热~||~酸洗完应监测腐蚀指示片的腐蚀量~||~酸溶液中添加缓蚀剂可保护锅炉不腐蚀~||~酸洗间隔不少于1年
17.离心泵的密封环________。
单选题A. 可只设静环~||~可只设动环~||~必须同设动环静环~||~A或B
18.A propeller of 5.65m in diameter, having a mean pitch of 4.88m, turning at 72 rpm, at a speed of 11 knots (339.79m/min), will give _____ of apparent slip.
单选题A. 0967~||~0033~||~0031~||~0969
19.For a diesel engine, when the piston is at the _____, the clearance volume is the largest.
单选题A. TDC~||~DTC~||~BDC~||~DBC
20.If your vessel bums 8 tons of fuel per hour at 15 knots, how many tons per hour will it burn at 18 knots?
单选题A. 1382tons~||~1561tons~||~1600tons~||~1637tons
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