Bridge gauge can be used to measure （） of a diesel engine.

【名词&注释】

摩擦系数(friction coefficient)、预热器(preheater)、船用增压器(ship turbocharger)、不低于(no less than)、耐磨性好(good wear resistance)

[单选题]Bridge gauge can be used to measure （） of a diesel engine.

A. diameters of journals
B. deflections of crankwebs
C. diameters of crankpins
D. none of the above

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学习资料：

[单选题]废气锅炉烟道温度在1000℃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

[单选题]废气锅炉受热面废气温度不能太低，否则凝结的硫酸可使烟灰有粘性，会增加烟垢形成的趋势，因此锅炉废气出口温度应不低于（）℃，锅炉进口给水循环温度应高于（）℃（对有预热器的）。

A. 180/120
B. 170/110
C. 155/120—130
D. 188/130

[单选题]船用增压器多采用（）轴承，因其具有（）、产生热量少和滑油耗量少等优点。

A. A．滑动/耐磨性好^{(good wear resistance)}
B. B．滑动/抗咬合性好
C. C．滚动/耐磨性好^{(good wear resistance)}
D. D．滚动/摩擦系数小

[单选题]按直线校中原理校中轴系时，下述正确的是（）。

A. δ＝0.05～0.10mm/m，φ＝0.10～0.15mm/m
B. 各轴承的负荷在允许值内
C. 各轴承的负荷在允许值内且合理分配，轴段内的应力、弯矩、转角均在允许值内或取合理数值
D. 都不对

[单选题]A SECONDARY function of a waste heat boiler is to （）.

A. reduce engine exhaust noise
B. reduce engine back pressure
C. increase engine cycle efficiency
D. increase turbocharger efficiency

[单选题]The rate of heat transfer in a water-tube auxiliary boiler can be increased by （）.

A. operating the boiler at less than normal water level
B. installing fins on the firesides of water-tubes
C. increasing the amount of excess air to the burners
D. treating the boiler water with chemical oxygen scavenger

[单选题]Auxiliary boilers are divided into several classifications, one of which is （）.

A. water-tube supercritical circulation
B. water-tube forced circulation
C. fire-tube controlled circulation
D. fire-tube express circulatio

[单选题]A diesel engine is operating with excessively high exhaust temperatures at all cylindersTo correct this condition, you should FIRST （）.

A. reduce the engine load
B. increase the cooling water flow
C. increase the lube oil pressure
D. adjust the fuel rack

[单选题]How many power strokes per crankshaft revolution are there in an eight cylinder, two stroke/cycle diesel engine?（）

A. One
B. Two
C. Four
D. Eight

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