发动机换向时间越短其机动性越好，规定不得大于（）s。

【名词&注释】

可靠性(reliability)、机动性(mobility)、增压器转子(blower rotor)

[单选题]发动机换向时间越短其机动性越好，规定不得大于（）s。

A. 5
B. 10
C. 12
D. 15

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学习资料：

[单选题]当气阀阀面出现麻点、腐蚀时可采用（）工艺修复。

A. 机械加工
B. 喷涂或喷焊
C. 电弧堆焊
D. 以上均可

[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]目前，越来越多的大型海船，尤其是新造船舶均采用（）艉轴承。

A. 赛龙
B. 尼龙
C. 白合金
D. 铁梨木

[单选题]For a continuous operation diesel engine, a duplex filter unit would be the best arrangement because （）.

A. changing filter elements would not interrupt engine operation
B. filtering occurs twice in each pass of oil through the system
C. clogging will not occur
D. dropping pressure is half of that through a single filter unit

[单选题]In using reduction gears to obtain efficient propeller speeds, （）.

A. they must be located at the after end of the engine
B. they can only be used with one engine at a time
C. they eliminate the need for controllable pitch propellers
D. they are connected to the engine with a flexible coupling

[单选题]White smoke exhausting from an operating diesel engine may indicate （）.

A. a cracked liner
B. burning lube oil
C. an overloaded engine
D. insufficient combustion air

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