In a general oil cooler circulated by sea water, the oil is at a higher pressure, the result being that any leak in the cooler will mean a loss of （）.

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• When used in conjunction with a turbocharger, the main function of an after-cooler is to （）

  A . increase the density of the cylinder air charge B . prevent turbocharger overheating C . liminate the need for a pre-cooler D . remove moisture from air compressed by the turbocharger

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• In a typical fuel system, the oil is stored in （） in the double bottom.

  A . setting tanks B . service tanks C . tanks D . drain tank

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• （）should generally best for handing acids,alkalis,various types of oils,solvents and chemicals in general.

  A . Heat-resistant gloves B . Rubber gloves C . PVC gloves D . Leather glove

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• In a central cooling system, used in some modem ships, sea water is supplied to cool （）which will circulate to other individual cooler, greatly reducing the corrosion problems.

  A . fresh water B . sea water C . cooling oil D . emulsio

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• The sequence of parts in a generally used fuel oil supply system for a main engine is （） (1)tanks in the double bottom (2)centrifuges (3)service tank (4)settling tank (5)viscosity regulator

  A . (1)-(2)-(4)-(3)-(5) B . (1)-(4)-(2)-(3)-(5) C . (1)-(3)-(2)-(4)-(5) D . (1)-(5)-(4)-(2)-(3)

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• Large crosshead type engine generally has two lubrication systems, a function performed only by cylinder oil system is（）

  A . lubricating B . cooling C . sealing D . cleaning

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• In an oil cooler circulated by sea water, the oil is at a larger pressure the result being that any leak in the cooler will mean a loss of （）.

  A . oil B . sea water C . refrigerant D . fresh water

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• A refrigerant with oil in solution has a （）.

  A . higher boiling temperature for a given pressure than does a pure refrigerant B . lower boiling temperature for a given pressure than does a pure refrigerant C . boiling pressure equal to that of a pure refrigerant at a given pressure D . boiling point will not be affected by entrained oil

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• Excessive oil foaming in the crankcase of a refrigeration compressor can result in （）.

  A . overheated compressor bearings B . excess lube oil viscosity C . carbon deposits on the compressor piston rings D . wax crystals forming in the lubricant

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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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• In general, the oil mist defectors include a base plate with air blast pumpThe function of air blast pump is to （）crankcase.

  A . supply clean air to the measuring compartment of the units for more accuracy B . generaate the pressure required for the extraction of the oil mist from the C . generate the pressure required for the extraction of the oil mist from the crankcase D . supply clean air to the measuring track of the units for more accuracy

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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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• Large crosshead type engine generally has two lubrication systems, a function performed only by crankcase oil system is（）

  A . lubricating B . cooling C . cleaning D . neutralizing

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• In which of the listed hydraulic systems will the installation of an oil cooler be necessary?（）

  A . Constant tension mooring winch system B . Hatch cover system C . Watertight door system D . Internal combustion engine hydraulic starter system

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• （EMB145）FCOC（Fuel Cooled Oil Cooler）装在（）

  A . FDMU的下游 B . FDMU的上游 C . 在FPMU的齿轮泵和离心泵之间

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• In a general cargo crane, three principal movements are （）； （）； （）.

  A . hoisting；luffing；slewing B . lifting；raising；lowering C . rotating；raising；handling D . hosting；lowering；moving

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• The connecting rod large end bearing shell generally has tags for location and oil grooves round the center of its axial length which correspond with grooves in the （） through which oil is transmitted up the rod to lubricate the small end.

  A . connecting rod B . piston rod C . bearing housing D . none of the above

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• Defective air cooler in a diesel engine will lead to （）.

  A . smoky exhaust B . starting failure C . overload D . over speed

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• What generally occurs when the land is cooler than the nearby water? （）

  A . A land breeze B . A sea breeze C . A norther D . A prevailing westerly

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• he oil（）in a source bed, and a marine shale.

  A . dominates B . originates C . terminates D . fascinate

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• In a typical fuel oil system, the oil is stored in tanks in the double bottom from which it is pumped to （） and heated.

  A . a service tank B . a collecting tank C . a sump D . a settling tank

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• Oil prices in China now follow trends.A．global

  B．urgent

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