平板形舵具有（）的特点。Ⅰ.结构复杂；Ⅱ.便于修造；Ⅲ.舵效高；Ⅳ.

【名词&注释】

摩擦力(friction)、柴油机(diesel engine)、成本低(low cost)、锯齿状(zigzag)、具体办法(concrete methods)、螺旋桨鸣音

[单选题]平板形舵具有（）的特点。Ⅰ.结构复杂；Ⅱ.便于修造；Ⅲ.舵效高；Ⅳ.舵效低；Ⅴ.成本低。

A. Ⅰ＋Ⅱ
B. Ⅰ＋Ⅳ＋Ⅴ
C. Ⅱ＋Ⅳ＋Ⅴ
D. Ⅰ＋Ⅲ＋Ⅳ

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学习资料：

[单选题]（）柴油机活塞运动部件在船上安装前必须先进行车间平台复验其相互位置精度。

A. 船员自修的
B. 进厂检修的副
C. 新造或大修的主
D. 新造发电

[单选题]活塞销的主要损坏形式是（）。Ⅰ.磨损；Ⅱ.摩擦；Ⅲ.擦伤；Ⅳ.腐蚀；Ⅴ.裂纹。

A. Ⅰ＋Ⅱ＋Ⅴ
B. Ⅰ＋Ⅴ
C. Ⅱ＋Ⅴ
D. Ⅰ＋Ⅲ＋Ⅴ

[单选题]螺旋桨与尾轴连接处扭矩的传递是依靠（）。Ⅰ.键与键槽的过盈配合；Ⅱ.压紧接合锥面产生的摩擦力

A. 仅Ⅰ对
B. 仅Ⅱ对
C. Ⅰ+Ⅱ
D. Ⅰ，Ⅱ都不对

[单选题]消除螺旋桨鸣音的具体办法^{(concrete methods)}是将桨叶随边0.4R～0.8R部分（）等抗鸣边缘，从而改变涡流引起的振动频率，也就不会与桨叶固有振动频率产生共振。Ⅰ.加厚；Ⅱ.减薄；Ⅲ.形成锯齿状；Ⅳ.质量改变；Ⅴ.钻孔。

A. Ⅱ＋Ⅲ
B. Ⅰ＋Ⅱ＋Ⅲ＋Ⅴ
C. Ⅲ＋Ⅳ＋Ⅴ
D. Ⅰ＋Ⅱ＋Ⅲ＋Ⅳ

[单选题]The shells are secured by means of bearing caps and studs, the necessary clearance being provided by means of （） of different thickness.

A. shims
B. packing
C. glands
D. washer

[单选题]The crankcase of many diesel engines are kept under a slight vacuum by the （）.

A. scavenging action of the piston
B. piston type vacuum pump taking suction off a differential manometer
C. gland exhausting manometer
D. crankcase exhaust fa

[单选题]Fuel injectors used in heavy fuel oil systems are usually provided with cooling to reduce（）.

A. cold corrosion of the nozzles
B. fuel viscosity for better atomization
C. carbon accumulation on the nozzles
D. fuel detonation in the cylinder

[单选题]If the water level dropped rapidly in the expansion tank of a closed diesel engine cooling water system, you should suspect a （）.

A. loss of suction in the circulating pump
B. leak in the primary cooling system
C. broken raw water pump shaft
D. burned or cracked piston in one cylinder

[单选题]What condition will result in the automatic shutdown of a diesel engine? （）

A. High jacket water pressure
B. High lube oil pressure
C. Low lube oil pressure
D. Excessive turbo charger speed

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