废气锅炉的排气流动阻力不能过大，因为二冲程低速柴油机增压器后

【名词&注释】

螺旋桨(propeller)、船舶动力装置(marine power plant)、柴油机增压器(diesel supercharging)、二冲程低速

[单选题]废气锅炉的排气流动阻力不能过大，因为二冲程低速柴油机增压器后的排气背压规定一般不宜超过（）。

A. 0.003MPa
B. 300mmH，0
C. 3000Pa
D. A，B，C均可

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学习资料：

[单选题]船舶动力装置的主要耗能设备是（）。Ⅰ.螺旋桨；Ⅱ.主机、发电机和辅助锅炉；Ⅲ.空气压缩机

A. 仅Ⅰ对
B. 仅Ⅱ对
C. Ⅰ+Ⅱ
D. Ⅰ+Ⅲ

[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]Engage the flywheel with the （）.

A. turning gear
B. motor
C. driving gear
D. driven gear

[单选题]If there is water in fuel oil, the revolution of the engine will （）.

A. decrease
B. increase
C. be dismantled
D. be reassembled

[单选题]Once a scavenge fire is detected, fuel should be shut off from the affected cylinders and cylinder lubrication increased （） the risk of seizure.

A. to protect
B. to guard
C. to maximize
D. to minimize

[单选题]In order to reverse the rotation of a two-stroke/cycle loop scavenged, direct reversing, propulsion diesel engine, the cam positions must be changed for the （）.

A. starting air and fuel pumps
B. piston cooling pumps
C. exhaust valves
D. all of the above

[单选题]An automated diesel engine should normally shut down due to （）

A. low lube oil temperature
B. high ambient air temperature
C. low tube oil pressure
D. high exhaust system back pressure

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