海船船员 - 船舶动力装置 - 查题吧

单选题

The needle valve in the injector （） at a pre-set pressure which ensures that the fuel will atomize once it enters the cylinder.

A. will lift
B. will be lifted
C. will close
D. will be closed

单选题

烟灰具有粘性，这是烟灰发生沉积的重要因素，关于烟灰粘性的预防措施的说明哪项是正确的（）。

A. 选择不同燃油型号与烟灰的粘性无关
B. 使用含有氧化铁的燃油添加剂，将使烟灰粘性增加
C. 烟灰的粘性减小可对废气流速的限制向上“浮动”
D. A，B，C都是错误的

单选题

使用液压拉伸器应按说明书规定的油压泵油，任何情况下均不得超过规定油压的（）和螺栓的（）。

A. 10%/最大外露量
B. 5%/最大伸长量
C. 5%/最小拉伸量
D. 10%/最大拉伸量

单选题

An electrically driven automatically operating auxiliary blower is provided for slow speed and （） of a low speed diesel engine.

A. manoeuvring operations
B. bad combustion
C. cooling
D. mooring trial

单选题

In large marine diesel engines cylinder oils usually contain additives formulated to impart the （） to clean the rings and grooves.

A. inefficiency
B. oiliness
C. detergency
D. purity

单选题

Increasing the load on an engine equipped with a constant speed mechanical governor, will cause the engine speed to initially （）.

A. increase
B. decrease
C. fluctuate
D. remain constant

单选题

螺旋桨与尾轴连接处扭矩的传递是依靠（）。Ⅰ.键与键槽的过盈配合；Ⅱ.压紧接合锥面产生的摩擦力

A. 仅Ⅰ对
B. 仅Ⅱ对
C. Ⅰ+Ⅱ
D. Ⅰ，Ⅱ都不对

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

With respect to the flow of lubricating oil through a diesel engine, the lube oil coolers are located after filters in order to （）.

A. allow filtration of less viscous oil
B. decrease the pressure drop across the filter
C. improve overall filtration
D. all of the above

单选题

The lower end of each piston rod is reduced in diameter to fit a bore in the cross-head, this being secured to the piston rod by （）.

A. a bolt
B. a cap
C. a disc
D. a nut

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