增压器喘振的常见原因是（）。

【名词&注释】

磨损率(wear rate)、柴油机(diesel engine)、使用情况(service condition)、气缸套(cylinder liner)、固定式(fixed)、增压器喘振(turbocharger surge)、不符合(inconformity)

[单选题]增压器喘振^{(turbocharger surge)}的常见原因是（）。

A. 叶片折断
B. 轴承损坏
C. 流道阻塞
D. 转子变形

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学习资料：

[单选题]并联连接系统按照部件的连接情况可分为备用部件和基本部件，根据使用情况有（）。Ⅰ.固定式连接热态（在负荷下）各用方式；Ⅱ.固定式连接冷态（在无负荷下）各用方式；Ⅲ.不固定式（流动式）连接各用方式

A. Ⅰ十Ⅱ
B. Ⅰ+Ⅲ
C. Ⅱ+Ⅲ
D. Ⅰ+Ⅱ+Ⅲ

[单选题]柴油机镀铬气缸套正常磨损率应在（）mm/kh范围内。

A. 0.1～0.3
B. 0.05～0.1
C. 0.01～0.03
D. 0.005～0.01

[单选题]防止拉缸的工艺措施主要是（）。Ⅰ.保证活塞运动装置的安装精度；Ⅱ.保证活塞运动装置的对中性；Ⅲ.采用波纹加工；Ⅳ.采用精车加工；Ⅴ.采用研磨加工。

A. A．Ⅰ＋Ⅱ
B. B．Ⅰ＋Ⅳ＋Ⅴ
C. C．Ⅱ＋Ⅲ
D. D．Ⅰ＋Ⅱ＋Ⅲ

[单选题]轴系的同轴度不符合^{(inconformity)}要求时，则轴系的（）也必然不符合^{(inconformity)}要求。

A. δ总、φ总
B. 所有法兰上的δ、φ
C. 某些法兰上的δ、φ
D. 任意法兰上的δ、φ

[单选题]Before a marine diesel engine is started the cylinders and pistons must be （）.

A. cooled to appropriate temperature
B. warmed up gradually to appropriate temperature
C. opened up and renewed
D. ground and polished

[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]The main purpose of the piston oil scraper rings is to （）.

A. seal the space between the piston and the liner
B. reduce the amount of lube oil burned in the combustion chamber
C. transmit heat from the piston to the cylinder liner
D. damp out fluctuations of the piston side thrust

[单选题]The most important factor in engine performance is the actual power output at the end of the crankshaft available for doing workThis is known as （）.

A. indicated horsepower
B. brake horsepower
C. net horsepower
D. friction horsepower

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