To lubricate the swivel or remove corrosion from a fire hose coupling，you should use（）.

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• Loss of lubricating oil pressure to the main propulsion diesel engine will actuate a/an （）.

  A . overspeed trip B . audible/visual alarm C . the ships/boats general alarm D . reserve oil storage tank

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• The oil quantity for bearing lubrication should be applied in such an amount as to be sufficient to carry away the （） caused by the friction at the bearings.

  A . acids B . additives C . heat D . gear

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• The way to reduce （） is to build up a film of lubricant between any two surfaces that rub against each other.

  A . friction B . collision C . inertia D . resistance

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• The main function of the lubrication system in to enable （） of a film of oil between the moving parts.

  A . the information B . the formation C . the scatter D . the frictio

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• Which lubricating oil additive is used in diesel engines to reduce the tendency for sludge and varnish to form on the engine parts?（）

  A . Flash point improvers B . Pour point improvers C . Inhibitors D . Foam suppressor

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• The （） of the lubricant should be sufficient to hold the film together, but it should allow the lubricant to flow easily.

  A . specific gravity B . viscosity C . acid value D . calorific value

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• Passages are drilled in the crankshafts of diesel engines to provide lubricating oil to the （）.

  A、main bearings B、connecting rod bearings C、piston pin bushings D、all of the above

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• On a medium-speed main propulsion diesel engine, the crank-pin or crank journal bearings receive lubricating oil from （）.

  A . a spindle lubricator B . an oil jet C . internal splashing D . drilled passages in the crankshaft

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• Lubricating systems for diesel engines are usually designed to initially provide lube oil to the engine （）

  A . camshaft beatings B . main bearings C . piston crowns D . cylinder wall

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• The amount of fluid friction or internal friction inherent in a mineral lubricating oil is reflected as a measure of its （）.

  A . specific gravity B . viscosity C . S E number D . hydrolytic stability

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• 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 filter

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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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• Increased internal leakage, in addition to poor hydraulic system response,and inadequate lubrication, is the result of （）.

  A . pump bearings in poor condition B . excessively worn actuator-piston packing C . broken directional control valve centering springs D . low hydraulic oil viscosity

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• Main engines as well as auxiliary engines operating on heavy fuel should have continuous on the lubricating oil, either according to the bypass or batch principles（）

  A . filtering B . centrifuging C . depositing D . operating

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• In engines with system, the lubricating oil can be added to the engine through the filling hole in the crankcase cover, by using a hand oil can, or through the separator pipe（）

  A . lubricating oil B . dry sump C . circulated tank D . wet sum

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• In addition to lubricating, cylinder oil assists in forming a gas seal and contains （） which clean the cylinder liner.

  A . additives B . water C . grease D . acid solutio

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• 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 lubricator

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• 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 lubricatio

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• The successful operation of any engine or machine and （） depend on effective lubrication.

  A . their no trouble period B . their freely trouble period C . its free trouble life D . its trouble-free life

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• In an engine with a pot-shaped piston, some lubricating oil from the main bearing will pass along a （） in the crankshaft to the bottom end bearing andthen up a connection rod to the gudgeon pin.

  A . telescopic pipes B . large bore C . drilled passage D . tied rod

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• Oil is supplied to the cylinder wall and （） by means of mechanical lubricators.

  A . the cylinder cover B . the piston rings C . the piston crown D . the piston skirt

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• （） clearances in the main or crank pin bearings will sometimes be indicated by loss of pressure in the lubricating system before any bearing knock is heard.

  A . Too larger B . Too smaller C . Excess D . Excessive

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• The scavenge port inspection should be carried out_____, to obtain the most reliable result with regard to the effectiveness and sufficiency of the cylinder lubrication and the combustion cycle (complete or incomplete).

  A.at the first stop after a long voyage e.gby anchoring if possible B.at the first stop after arrival at harbor C.at the first stop after low load running D.at the first stop after passing river or canal passage

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