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【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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更多“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 （）”相关的问题

第1题

[单选题] Which of the listed cylinder liner surface conditions indicates proper lubrication?（）

A、Dull black appearance B、Bright appearance C、Thin layer of lacquer D、Thick oily film

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第2题

[单选题] The most crucial time for any bearing with regards to lubrication is （）

A、during low loads B、after proper oil viscosity is reached C、during starting D、after cleaning filters

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第3题

[单选题] Two important considerations for the proper lubrication of a diesel engine include the delivery of the oil in sufficient amount and the （）.

A、cetane number B、pour point C、viscosity temperature D、quality of the oil

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第4题

[单选题] Which of the following methods is normally used to lubricate bearings in a small high-speed diesel engine?（）

A、Splash lubrication B、Pressure lubrication C、Sight feed lubricators D、Mechanical lubricators

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第5题

[单选题] Lubricating oil systems for diesel engine journal bearings are usually lubricated by which of the following types of lubricating oil systems?（）

A、Splash B、Gravity C、Pressure D、Bypass

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第6题

[单选题] Lubricating oil is supplied to the crank-pin bearings in a marine diesel engine by （）.

A、internal crankshaft passages B、immersion in oil C、splash lubrication D、injection lubrication

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第7题

[单选题] Proper lubrication of the main bearings is more easily obtained in a single acting, four-stroke/cycle diesel engine than in a tow-stroke/cycle diesel engine because（）.

A、The direction of pressure on the journal in four-stroke engine is continuously B、positive feed lubricators are installed on all bearings of four-stroke engine, whereas as a splash feed system is used on tow-stroke engine C、four-stroke engines usually utilize a heavier grade of oil than tow-stroke engines D、Low-stroke engines usually consume less lube oil than four-stroke engines

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第8题

[] The common method of applying oil to the cylinder walls is by means of small pump assembled in units, known as （）.

A、A.mechanical lubricator B、B.lubrication function C、C.forced feed system D、D.bearing lubrication

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第9题

[单选题] Excessive oil foaming in the crankcase of a refrigeration compressor at start up can cause（）.

A、compressor damage from improper lubrication B、refrigerant absorption by the lubricant C、increased viscosity in the lubricant D、carbon deposit on the compressor suction valves

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