舵角指示器正常时，转舵不准，舵角不正，正舵时舵角不在零位的原

【名词&注释】

可靠性(reliability)、指示器(indicator)

[单选题]舵角指示器正常时，转舵不准，舵角不正，正舵时舵角不在零位的原因主要是（）造成。Ⅰ.舵机故障；Ⅱ.舵杆弯扭变形；Ⅲ.舵杆安装不良；Ⅳ.舵安装时没对准零位；Ⅴ.舵机功率不足。

A. Ⅰ＋Ⅱ
B. Ⅰ＋Ⅳ＋Ⅴ
C. Ⅱ＋Ⅳ
D. Ⅰ＋Ⅲ＋Ⅳ

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学习资料：

[单选题]关于可靠性的规定（）。Ⅰ.“完成规定功能”；Ⅱ.“不发生故障”；Ⅲ.“发生故障”

A. Ⅰ=Ⅱ
B. Ⅰ=Ⅲ
C. Ⅰ≠Ⅱ
D. Ⅰ，Ⅱ，Ⅲ无关系

[单选题]零件上的微小裂纹可采用修锉、打磨的方法予以消除，若裂纹深度达到裂纹所在壁厚的（）时，则应停止修锉、打磨，改用其他的方法修理或报废。

A. A．5%
B. B．3%
C. C．2%
D. D．1%

[单选题]（） at the end of the distribution pipe ensures that adequate pressure is maintained by the pump.

A. A relief valve
B. An alarm
C. A pressure gauge
D. A non-maim valve

[单选题]Which of the following problems can cause fluctuating pressures in the closed cooling system of a main propulsion diesel engine?（）

A. Defective temperature controls in the system
B. Cavitation in the cooling water pump
C. Opened vent in the cooling system
D. Restricted water passages in the engine

[单选题]An increased pressure differential between the inlet and outlet of a strainer usually indicates the strainer is （）

A. holed
B. fouled
C. clean
D. dry

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