在约定MCR工况下，建议废气管内流速不超过50m/s，实际上为避免压

【名词&注释】

燃烧室(combustion chamber)、喷油器(injector)、喷油泵(fuel injection pump)、穿透性裂纹、实际上(actually)、增压器转子(blower rotor)

[单选题]在约定MCR工况下，建议废气管内流速不超过50m/s，实际上^(actually)为避免压力损失太大，废气流速约为（）m/s

A. 40
B. 35
C. 30
D. 25

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学习资料：

[单选题]吊缸发现燃烧室零件表面有水锈时，表明（）产生穿透性裂纹。

A. 活塞
B. 气缸
C. 喷油器
D. 气缸或活塞

[单选题]位于喷油泵和高压油管之间的出油阀，其作用有（）。Ⅰ.止回；Ⅱ.便于排除空气；Ⅲ.缩短喷油迟后阶段；Ⅳ.控制高压油管中的剩余压力。

A. Ⅰ＋Ⅲ＋Ⅳ
B. Ⅰ＋Ⅱ＋Ⅳ
C. Ⅱ＋Ⅲ
D. Ⅰ＋Ⅱ＋Ⅲ＋Ⅳ

[单选题]增压器自带油泵工作的可靠性与其安装质量有关，安装时应保证（）。

A. A．油泵的位置准确
B. B．油泵轴线与增压器转子^{(blower rotor)}轴线垂直
C. C．油泵轴线与转子轴线平行
D. D．油泵轴线与转子轴线同轴

[单选题]由于轴系的实际变形难以检测，通过测量轴系的相邻轴两法兰的（）来了解轴系轴心线的实际状态。

A. 偏移值
B. 偏心值
C. 偏中值
D. 曲折值

[单选题]Fuel is not supplied to the corresponding cylinders due to （）.

A. a failure of the motor
B. a failure of lubricator
C. a failure of cylinder
D. a failure of fuel pum

[单选题]In the event of the cylinder starting valve leakage （） would pass into the air pipes and ignite the oil deposited.

A. cooling water
B. vapor from the boiler
C. starting air
D. hot gase

[单选题]If a diesel engine is difficult to start and operates with the engine temperatures lower than normal, you should suspect that the （）.

A. compression pressures are below normal
B. lube oil is diluted with fuel oil
C. cranking speed is too low
D. exhaust system is partially restricted

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