In a four-stroke engines the camshaft rotates at （）.

【名词&注释】

冷却水(cooling water)、船舶动力装置(marine power plant)、质量指标(quality index)、直接影响(directly affect)、压力表(pressure gauge)、穿透性裂纹、轮机员(engineer)

[单选题]In a four-stroke engines the camshaft rotates at （）.

A. half the engine rotational speed
B. twice the engine rotational speed
C. the engine rotational speed
D. four times the engine rotational speed

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学习资料：

[单选题]可靠性在船舶动力装置质量指标中占有特殊的地位，因为它是（）。Ⅰ.落实其他质量指标的前提；Ⅱ.直接影响其他指标的优劣

A. 仅Ⅰ对
B. 仅Ⅱ对
C. Ⅰ，Ⅱ都对
D. Ⅰ，Ⅱ都不对

[单选题]柴油机运转中，轮机员^(engineer)可根据气缸或活塞冷却水的（）直接迅速判断零件上有无穿透性裂纹。Ⅰ.压力变化；Ⅱ.压力表指针波动；Ⅲ.水温变化；Ⅳ.流量变化；Ⅴ.膨胀水柜水位波动。

A. Ⅰ＋Ⅱ＋Ⅳ
B. Ⅰ＋Ⅱ＋Ⅴ
C. Ⅱ＋Ⅲ＋Ⅳ
D. Ⅱ＋Ⅲ

[单选题]曲轴臂距差的符号表明曲轴（）。

A. 受力程度
B. 受力方向
C. 弯曲变形方向
D. 应力性质

[单选题]（） is usually driven by the engine camshaft and supplies pilot air to the cylinder air start valve.

A. An air receiver
B. An operating valve
C. An automatic valve
D. An air distributor

[单选题]For Vee-form engines, （） is shaped to given two slopping surface on which （） are placed at the correct relative angle to each other.

A. the bottom of the column；the cylinder blocks
B. the top of the column；the cylinder heads
C. the top of the column；the cylinder blocks
D. the bottom of the column；the cylinder head

[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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