【导读】
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1. [单选题]动力装置有效热效率是指()。Ⅰ.每小时螺旋桨推力功的相当热量与同一时间内动力装置消耗的燃油完全燃烧所放出的总热量之比;Ⅱ.每小时主机有效功的相当热量与同一时间内动力装置消耗的燃油完全燃烧所发出的总热量之比
A. 仅Ⅰ对
B. 仅Ⅱ对
C. Ⅰ,Ⅱ都对
D. Ⅰ,Ⅱ都不对
2. [单选题]废气锅炉烟道温度在1100℃以上时可能发生()。
A. 小的烟垢着火
B. 锅炉爆炸
C. 铸铁着火
D. 氢着火
3. [单选题]由于铁梨木需进口,价格较高,故采用()作为铁梨木的代用材料。
A. 尼龙
B. 桦木层压胶木
C. 橡胶
D. 赛龙
4. [单选题]螺旋桨修理后的半径和各种螺距的偏差值应符合标准,偏差值是指()之差。
A. 设计值与计算值
B. 实测值与计算值
C. 设计值与实测值
D. 理论值(theoretical value)与实测值
5. [单选题]() is usually driven by the engine camshaft and supplies pilot air to the cylinder air start valve.
A. An air receiver
B. An operating valve
C. An automatic valve
D. An air distributor
6. [单选题]Fuel oil is pumped by means of () from the bunker tanks.
A. a transfer pump
B. a bilge pump
C. a service pump
D. a vacuum pum
7. [单选题]The () of the lubricant should be sufficient to hold the film together, but it should allow the lubricant to flow easily.
A. specific gravity
B. viscosity
C. acid value
D. calorific value
8. [单选题]The concentration of total dissolved solids in the water of an auxiliary boiler can increase as a result of ().
A. seawater contamination
B. frequent surface blows
C. dissolved oxygen deaeration
D. frequent bottom blow
9. [单选题]If ignited,which material would be a class B fire?()
A. Magnesium
B. Paper
C. Wood
D. Diesel Oil