废气锅炉烟道温度在300—400℃时可能发生（）。

【名词&注释】

机械设备(mechanical equipment)、增压器(turbocharger)、四冲程柴油机(four-stroke diesel engine)、装卸货物(cargo handling)

[单选题]废气锅炉烟道温度在300—400℃时可能发生（）。

A. 高温着火
B. 小的烟垢着火
C. 氢着火
D. 铸铁着火

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学习资料：

[单选题]甲板机械是为保证（）的机械设备。

A. 船舶航行、停泊
B. 装卸货物^{(cargo handling)}及起落重物
C. 船舶稳性
D. A+B

[单选题]增压四冲程柴油机当停增压器运转时，可做的调整工作是（）。

A. 适当增大气阀重叠角
B. 适当增大气阀重叠角
C. 适当增大气阀间隙
D. 适当减小气阀间隙

[单选题]Before pumping up the crankcase oil,（） should be worked by hand to minimize corrosive action on the liners.

A. the indicators
B. the starting valves
C. the cylinder lubricators
D. the turning gear

[单选题]The cast iron guide-ways for （） are attached to the top section and seal off the crankcase.

A. the connecting rod
B. the cross-head
C. the piston rod
D. the air box

[单选题]In any diesel engine closed freshwater cooling system, the lowest pressure exists at the （）.

A. jacket water outlet
B. cooling water pump outlet
C. heat exchanger outlet
D. expansion tank atmospheric vent

[单选题]The opening of an exhaust valve on a modem, large, low-speed, main propulsion diesel engine may be actuated by （）.

A. direct action of cam shaft
B. compressed air pressure
C. hydraulic “push rods”
D. direct action of the main piston moving dow

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