In the （） pressure charging system the pulse of energy tha

【名词&注释】

阴极保护(cathodic protection)、防腐剂、燃烧室(combustion chamber)、电化学腐蚀(electrochemical corrosion)、保护膜(protective film)、仔细观察(careful observation)

[单选题]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

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学习资料：

[单选题]柴油机吊缸时，不正确的做法是（）。

A. 起吊活塞组件之前应将缸套的磨台修磨光顺
B. 在拆卸下来的零件配合面上做好记号
C. 活塞组件吊出后应仔细观察^{(careful observation)}燃烧室零件的表面状态
D. 活塞组件吊出后应用木板将气缸孔口盖住

[单选题]为了防止涡轮壳体电化学腐蚀，除用淡水冷却外，可以采用（）等方法。Ⅰ.壳体表面覆盖保护膜^{(protective film)}；Ⅱ.阴极保护；Ⅲ.阳极保护；Ⅳ.淡水中加防腐剂；Ⅴ.安装防腐锌块。

A. Ⅱ＋Ⅳ
B. Ⅰ＋Ⅱ＋Ⅳ＋Ⅴ
C. Ⅰ＋Ⅳ＋Ⅴ
D. Ⅰ＋Ⅱ＋Ⅴ

[单选题]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皮。

A. Ⅱ＋Ⅲ
B. Ⅰ＋Ⅱ＋Ⅳ＋Ⅴ
C. Ⅲ＋Ⅳ＋Ⅴ
D. Ⅱ＋Ⅲ＋Ⅳ

[单选题]For diesel engine piston cooling, lubricating oil can be supplied to the pistons by a/an （）.

A. oil spray
B. oil bath
C. oil control rings
D. drilled passage through the camshaft

[单选题]The PRIMARY function of a waste heat boiler is to （）

A. reduce engine exhaust noise
B. reduce engine back pressure
C. recover heat which otherwise would be lost
D. increase turbocharger efficiency

[单选题]Which of the substances listed is satisfactorily removed from the fuel by a centrifugal oil purifier?（）

A. Impurities
B. Lube oil
C. Gasoline
D. Diesel fuel

[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

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