某螺旋桨半径为2m，将装于其上的螺距规的水平杆旋转36°时量杆的

【名词&注释】

螺旋桨(propeller)、空压机(air compressor)

[单选题]某螺旋桨半径为2m，将装于其上的螺距规的水平杆旋转36°时量杆的升程为256mm，其局部螺距为（）。

A. 25.6mm
B. 2560mm
C. 17.8mm
D. 1780mm

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学习资料：

[单选题]发动机连续起动次数取决于（）和（）。

A. 空气瓶容积/空压机功率
B. 空气瓶容积/主机起动性能
C. 空压机功率/空压机台数
D. 空压机数量/空压机台数

[单选题]油润滑艉轴承和艉轴在（）式润滑系统中工作，艉轴（）。

A. 闭/包铜套
B. 闭/不包铜套
C. 开/包铜套
D. 开/不包铜套

[单选题]The temperature difference between the inlet and outlet temperature of the lube oil cooler in the lubricating system for the diesel engine is generally between （）.

A. 8-10℃
B. 10-12℃
C. 10-15℃
D. 10-20℃

[单选题]The crankcase of many diesel engines are kept under a slight vacuum by the （）.

A. scavenging action of the piston
B. piston type vacuum pump taking suction off a differential manometer
C. gland exhausting manometer
D. crankcase exhaust fa

[单选题]If a four-stroke/cycle diesel engine is running at 1550 RPM, the speed of the camshaft will be（）.

A. 525 RPM
B. 775 RPM
C. 1550 RPM
D. 1800 RPM

[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

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