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

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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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• On what do you depend having the air cooler of main engine chemically washed?（）

  A . increased air pressure differenced before and aft air cooler B . reduced exhaust temperature in all cylinders C . reduced temperature difference between water inlet and outlet D . both A and C

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• Air bubbles in a hydraulic governor can cause （）

  A . sluggish response B . speed droop variations C . isochronous governing D . sensitivity increase

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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 scavenge air receiver is of a simplified and modular design with integral non-return flaps, hanging cooler and two auxiliary air blowers（）

  A . dozens B . parcels C . bundles D . gallo

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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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• Defective timing gear in a diesel engine may lead to （）.

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

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• 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 （）.

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

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• Compared to a low pressure system，generally the air in a high is（）.

  A . warmer，less dense，and less stable B . cool，more dense，and drier C . muggy and cloudy D . extremely moist with high relative humidity

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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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• What is the function of the after-cooler installed in the diesel engine air intakes system?（）

  A . Decrease the air density B . Increase the exhaust temperature C . Decrease the lube oil temperature D . Increase the air density

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• The fresh air coming in through the inner air ports, is compressed by（） to a higher pressure.

  A . the cylinder head B . the cross-head C . the moving piston D . the stationary pisto

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• Condensate must be drained from the intercooler and after-coolers of an air compressor because （）.

  A . the cooling effect of the condensate reduces the compressors efficiency B . a danger of explosion exists whenever water is present in a compressor C . water causes erratic operation of pneumatic components D . the volumetric capacity of the first stage is reduced if water remai

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• A defective injector nozzle in a propulsion diesel engine can cause（）

  A . engine power losses B . smoking due to unburned fuel C . high exhaust temperature readings D . all of the above

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• The efficiency of turbocharge system is increased by fitting a charge air cooler （） the compressor.

  A . inside B . before C . after D . against

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• The air charge leaving an intercooler, or after-cooler of an air compressor can be expected to be （）.

  A、superheated B、super-cooled C、at or below the dew point D、All of the above

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• Defective governor in a diesel engine may lead to （）.

  A . smoky exhaust B . starting failure C . ignition relay D . over speed

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• A restricted air intake to a diesel engine may result in the engine （）.

  A . failing to reach rated speed B . knocking under maximum load C . hunting or surging under light load D . overspeeding and running away

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• When operating the air supply system in a covered lifeboat the（）.

  A . fuel supply valve should be closed B . hatches，doors，and oar ports should be closed C . air cylinder shut-off valve should be closed D . engine should be shut off

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• When the air in a certain space is squeezed to occupy a smaller space, the air is said to be ______.

  A．commenced B．compressed C．compromised D．compensated

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• In international air cargo transportation， a freightforwarder offering a consolidation service will issue its own air waybill.Thisis called（）.

  A．MAWB B．HAWB C．IATA D．TACT

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• 翻译：Yet there was a bigger movement in the air by 1750.

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• They made a fire in the open air and cooked a meal over it. ______ was made in the open air and a meal ______ over it.

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