Although lube oils used in the main lubricating service systems should have a relatively high flash point to avoid ignition, they can create smoke and fire hazards when they （）.

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• If the detergent type lubricating oil being used in a diesel engine is black, the oil （）

  A . must be centrifuged B . must by filtered C . must be changed D . is holding finely dispersed carbon in suspensio

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• If the analysis of used lube oil indicates a high content of iron particles, this could indicate（）

  A . corrosive deterioration of a bearing B . inadequate air filtration C . excessive ring and liner wear D . excessive cooling of lubricating oil

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• Which of the listed conditions can be used to determine if lube oil has been diluted by fuel? （）

  A . Viscosity is decreased B . Octane number is altered C . Pump speed is decreased D . Blower’s speed is decreased

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• If the cooling water temperature and the lube oil temperature in a diesel engine are too high, the cause can be （）

  A . a dirty lube oil strainer B . internal water leaks C . an oil suction line restriction D . excessive wears of the cooling water pum

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• Which of the following characteristic of lube oil helps to reduce the amount of deposits in the piston ring belt during the combustion process in a diesel engine?（）

  A . Low viscosity index B . Low carbon forming tendencies C . High film strength D . High non-corrosive qualitie

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• Fuel oil contamination of an auxiliary diesel engine lube oil can result in（）

  A . an increased flash point B . higher lube oil pressures C . an increased viscosity D . lower lube oil pressure

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• For a main diesel engine the lube oil in the bearings is drawn from （）, usually located in the bedplate.

  A . a gravity tank B . a sump C . a vessel D . a bottle

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• In cleaning up an oil spill, the use of chemical agents would （）.

  A . absorb the oil for easy removal B . remove the oil from the water C . disperse or dissolve the oil in the water D . not affect the oil

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• When fuel oil is accidentally missed with lube oil which of the following processes can be used to separate them?（） Ⅰ.filtering Ⅱ.settling

  A . Ⅰ only B . Ⅱ only C . either Ⅰ or Ⅱ D . neither Ⅰ or Ⅱ

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• The oxidation by-products forming in diesel engine lube oil can cause （）

  A . pitting B . sludge C . hard varnish D . all of the above

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• In a full flow type lube oil system, the bypass relief valve will lift due to （）

  A . a clogged filter element B . excessive lube oil pump discharge pressure C . excessive lube oil flow D . excessively hot lube oil

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• If a used lube oil analysis indicates excessive fuel dilution, the lube oil should be （）

  A . changed B . centrifuged C . filtered D . settled

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• High lube oil temperatures developing in a diesel engine can result from（）

  A . high oil pressure B . excessive bearing end play C . plugged oil control rings D . engine overload

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• 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

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• An important consideration in selecting a lubricating oil for use in a refrigeration compressor is for the oil to （）

  A . have a high viscosity index B . mix readily with refrigerant C . have a high freezing point D . have a low pour point

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• 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℃

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• （） providing lubricating films, oil used in marine diesel engines have to remove heat from oil cooled piston.

  A . Except for B . Beside C . Except D . In addition to

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• The term OIL as used in the Oil Pollution Regulations means（）.

  A . fuel oil B . sludge C . oil refuse D . All of the above

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• In a diesel engine lube oil system, which of the following parts should be lubricated first?（）

  A . Camshaft beatings B . Main bearings C . Piston crowns D . Cylinder wall

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• A sudden decrease in the diesel engine lube oil viscosity could be an indication of（）

  A . loss of additives from the lube oil B . carbon deposits in the lube oil C . excessive centrifuging D . excessive fuel dilutio

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• Most large, low-speed, main propulsion diesel engines use duplex lube oil strainer to （）

  A . decrease the time required between cleanings B . removes all large and small foreign objects C . ensure a positive flow of oil at all times D . ensure that all lube oil has been treated twice

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• In order to benefit from the use of storm oil in heavy seas，the storm oil should be spread （）.

  A . around the rudder and screws B . completely around the vessel C . to leeward of the vessel D . to windward of the vessel

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• If a used lube oil analysis indicates an excessive chromate content, this means （）

  A . air filtration is inadequate B . engine coolant leaking into the lube oil C . fuel oil is leaking into the lube oil D . the piston rings are excessively wor

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• Although it often rains in London, most people don't like to use umbrellas.

  正确 错误

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