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【单选题】

Diesel engines are started by supplying （） into the cylinders in the appropriate sequence for the required direction.

A、cooling water

B、compressing air

C、compressed air

D、cylinder oil

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更多“Diesel engines are started by supplying （） into the cylinders in the appropriate sequence for the required direction.”相关的问题
第1题
[单选题] （）, so they are widely used on board ship nowadays.

A、Diesel engines have more advantages in comparison with gasoline engines  B、Diesel engines have more advantages in comparison to gasoline engines  C、Gasoline engines have more advantages in comparison with diesel engines  D、Gasoline engines have more advantages in comparison to diesel engines  

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第2题
[单选题] （）are increasingly used as main engine on merchant vessels, because they have a high Hp/Weight ratio.

A、Slow speed diesel engines  B、Medium-speed diesel engines  C、Steam engines  D、Gasoline engines  

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第3题
[单选题] How often should the lubricating oil of a diesel engine be changed?（）

A、After every trip  B、Every 4000 hours  C、According to manufacturer’s instructions  D、Every time they are shutdown  

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第4题
[单选题] Exhaust pipes for separate diesel engines can be combined only when （）

A、space limitations prevent separately run pipes  B、the engines are small auxiliary units  C、they are arranged to prevent gas backflow to each engine  D、a waste heat boiler is installed  

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第5题
[单选题] The size of the exhaust valve opening is （）

A、most critical in a four-stroke cycle diesel engine  B、most critical in a two-stroke/cycle diesel engine  C、most critical in a four-stroke/cycle diesel engine if it is turbocharged  D、of equal importance in a two-stroke/cycle diesel engine as in a four-stroke/cycle diesel engine  

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第6题
[单选题] Diesel engines are considered safer than gasoline engines because（）.

A、they are more heavily built  B、the fuel used is less volatile  C、they can be easily reversed  D、they operate at a lower speed  

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第7题
[单选题] Typical marine propulsion plants include（） directly coupled to the vessel’s single large-diameter, fixed-pitch propeller.

A、a single, long-stroke, slow-speed, turbocharged, two-stroke diesel engine  B、a single, long-stroke, medium-speed, turbocharged, four-stroke diesel engine  C、two medium-speed, turbocharged, four-stroke diesel engines  D、a variable-speed AC generator  

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第8题
[单选题] Proper lubrication of the main bearing is more easily obtained in a single acting four-stroke/cycle diesel engine than in a single acting two-stroke/cycle diesel engine because （）

A、bearing pressure in a four-stroke\cycle acting single diesel engine is continually reversed  B、bearing pressure in a two-stroke\cycle single acting diesel engine is continually reversed  C、the maximum bearing pressure is higher in a single acting two-stroke/cycle diesel engine  D、two-stoke/cycle diesel engines require more complicated lubrication piping  

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第9题
[] In a diesel engine, exhaust valves open before the intake ports are uncovered to （） Ⅰ.reduce pumping losses Ⅱ.reduce back pressure In a diesel engine, exhaust valves open before the intake ports are uncovered to （） Ⅰ.reduce pumping losses Ⅱ.reduce back pressure

A、A.Ⅰonly  B、B.Ⅱonly  C、C.bothⅠand Ⅱ  D、D.neitherⅠnor Ⅱ  

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第10题
[单选题] The most common forms of main drive used on deck auxiliaries are （）.

A、steam plants, electric motors and compressed air  B、diesel engine, hydraulic machinery and compressed air  C、steam plants, electric motors and hydraulic machinery  D、diesel engines, steam plants and hydraulic machinery  

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