【名词&注释】
柴油机(diesel engine)、动力装置(power plant)、实际情况(actual situation)、测量精度高(high measuring accuracy)
[单选题]如果两根中间轴连接法兰的位置处于两轴承间距的中间,则轴系会出现()。Ⅰ.轴系挠度过大;Ⅱ.轴系难以准确对中;Ⅲ.安装不方便
A. Ⅰ+Ⅱ
B. Ⅱ+Ⅲ
C. Ⅱ+Ⅲ
D. Ⅰ+Ⅱ+Ⅲ
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[单选题]推进装置的推进效率为推进轴上总有效功率与推进装置消耗的热量之比,因此它与()无关。
A. 动力装置消耗的能量
B. 动力装置的余热利用
C. 推进装置的燃料消耗
D. A+B
[单选题]测量曲轴臂距差时,要求在()情况下进行,以保证测量精度高(high measuring accuracy)和与实际情况相符。Ⅰ.柴油机正车运转;Ⅱ.柴油机倒车运转;Ⅲ.装表位置不变;Ⅳ.一次装表;Ⅴ.不更换表。
A. Ⅰ+Ⅲ+Ⅳ
B. Ⅲ+Ⅳ
C. Ⅰ+Ⅳ+Ⅴ
D. Ⅰ+Ⅳ
[单选题]Sea water is not directly used as a coolant for engines because of its ().
A. low specific heat
B. corrosive action
C. high expense
D. acid property
[单选题]Fins are installed on the generating tube surfaces in waste heat boilers to ().
A. prevent soot fires in the exhaust system
B. prevent exhaust gas erosion of the tubes
C. increase the velocity of exhaust gas flow
D. increase the rate of heat transfer
[单选题]On most diesel engines, the governor controls the output speed by ().
A. controlling the amount of fuel injected into the cylinders
B. varying the speed of the turbocharger
C. adjusting the compression ratio
D. changing the timing of the fuel injection camshaft
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