在舵机功能正常的情况下，出现舵沉重，转舵不灵，转满舵需较长时

【名词&注释】

增压器(turbocharger)、平均值(average)、四冲程柴油机(four-stroke diesel engine)

[单选题]在舵机功能正常的情况下，出现舵沉重，转舵不灵，转满舵需较长时间，这可能是（）等原因造成的点。Ⅰ.舵叶进水；Ⅱ.舵承间隙过大；Ⅲ.舵系安装不正；Ⅳ.舵杆弯曲变形；Ⅴ.舵承损坏。

A. Ⅰ＋Ⅱ＋Ⅴ
B. Ⅰ＋Ⅲ＋Ⅳ
C. Ⅱ＋Ⅳ＋Ⅴ
D. Ⅰ＋Ⅲ＋Ⅳ＋Ⅴ

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学习资料：

[单选题]对于质量分布不在同一平面内，轴向长度较大的回转件，其平衡程度用（）表示。

A. A．FR
B. B．e
C. C．e•ω
D. D．G

[单选题]局部螺距是桨叶上（）的螺距。

A. 任意半径截面上任意角度的
B. 任意半径截面上任意角度的螺距平均值
C. 根据任意半径截面上任意角度的部分螺距计算出
D. 任意半径截面上任意角度的部分螺距的平均值

[单选题]四冲程柴油机停增压器运转，相当于非增压柴油机，但此时工作的主要问题是（）。

A. 气阀重叠角较小，排气不畅
B. 气阀重叠角较大，排气不畅
C. 气阀重叠角较小，排气倒流
D. 气阀重叠角较大，排气倒流

[单选题]A: Please tell me the specifications and quantity.B: （）

A. Pump diesel oil first
B. 300 tons of 180 cst fuel oil
C. The figure is all right
D. OK, I’ll sign it

[单选题]After "F.W.E" is given, the air system is shut down, the （） gear put in, all drains and indicator cocks opened, and the cooling water kept running.

A. steering
B. timing
C. turning
D. running

[单选题]In a large, slow-speed, main propulsion diesel engine, which of the parts listed is under tension when the engine is running?（）

A. Bed plate
B. Column
C. Entablature
D. Tie rod

[单选题]One major disadvantage of a low-speed diesel as compared to a steam main-propulsion system is（）.

A. the extra weight required for the diesel reduction gearing
B. a minimum speed for the engines that limits the minimum speed of the vessel
C. the higher fuel consumption per SHP
D. the low efficiency of the system when a controllable pitch propeller is used

[单选题]Overspeed of the diesel engine driving an electric generator could cause（）.

A. low voltage trip
B. reverse power trip
C. damage to windings
D. excessive exhaust temperature

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