The exhaust pipe must be gas tight throughout its entire length otherwise（）.

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  A . clear B . hazy light brown C . hazy light blue D . hazy light grey

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• Most pump manufacturers recommended that the discharge piping for centrifugal pumps be （）.

  A . one size larger than the pump discharge nozzle B . the same size as the pump discharge nozzle C . one size smaller than the pump discharge nozzle D . installed with a short radius elbow at the pum

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• In machinery space, the valves, pipes should be（）

  A . arranged as close to each other as possible to save space B . arranged far away from each other for convenient operation C . be fixed or clamped to avoid vibration D . kept easy removable as to convenient repairing work

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• The normal color of the exhaust gas of the diesel will be （）

  A . achromatism or thin gray B . thin white C . sky-blue D . black

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• During the valve overlap period, the exhaust pressure of a turbochargers, four-stroke/cycle diesel engine must be less than the intake manifold pressure to ensure （）

  A . effective cylinder scavenging and cooling B . constant pressure from the turbochargers C . cooler operation of the exhaust system D . effective constant pressure for turbocharger operatio

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• The exhaust gases for a new engine should be （） when the engine operates under full load.

  A . smoky B . a little bit dense C . visible D . almost invisible

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• In an engine with air inlet valve and exhaust valve on its cylinder heads the fresh air will enter into the cylinder （） and the gases exhaust （）, there being an adequate overlap between the inlet opening and the exhaust closing.

  A . downwards；upwards B . upwards；downwards C . downwards；downwards D . upwards；upward

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• The fuel pipes and ducts should be blown with （）.

  A . atmosphere B . the fresh water C . compressed air D . chemical compound

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• The remaining oil in the lubricating pipes and ducts should be blown out with （）.

  A . atmosphere B . the fresh water C . compressed air D . chemical compound

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• （）is a caing used for exhaust pipe from the engines.

  A . The funnel B . The messroom C . The galley D . The satellite antenna

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• The outside diameter of the pipe is （） the diameter of the bore of the piston rod, the result being that an annular space formed between the piston rod and the pipe.

  A . less than B . greater than C . equal to D . twice larger tha

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• The lubricating pipes and dusts should be blown out with （）.

  A . atmosphere B . the fresh water C . compressed air D . chemical compound

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• Most pump manufacturers recommend that the suction piping dimension for centrifugal pumps be （）.

  A . one size smaller than the pump suction nozzle B . the same size as the pump suction nozzle C . one size larger than the pump suction nozzle D . installed with a short radius elbow at the pum

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• In order for combustion to occur inside a piping system such as a vapor collection header in a marine emmission control system，there must be（）.

  A . fuel B . oxygen C . ignition D . All of the above

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• If no gaskets are used in the piping joints of a Freon system, the joints must be（）

  A . finished joints B . welded joints C . ground joints D . soldered joint

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• Which factor must be considered when determining the order of loading of dissimilar products through the same piping system aboard a tanker? （）

  A . Contamination of the cargo B . Flash points C . Reid vapor pressures D . Specific gravitie

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• The replacement piping for diesel engine high pressure fuel systems must be the same length and diameter as the original piping to （）.

  A . avoid unnecessary pints inventory B . keep torsional vibration constant C . use existing supports and braces D . maintain specified injection characteristic

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• Fixed piping leads from the（）to various areas of the compartment to be flooded.

  A . manifold B . remote pull box C . discharge nozzle D . machinery space

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• The rising of the exhaust temperature in manifold pipe may NOT result from （）.

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• Provision must be made in pipe systems for changes in length due to change of temperatureThe bold and italic word “provision” probably means （）.

  A . flanges B . nuts C . expansion joints D . bolt

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• All items such as steam pipes, exhaust pipes and fittings which, because of their location and operating temperature, present a hazard should be adequately lagged.That means the items should（）

  A . not be put into operation too early B . be pay adequate attention to C . be used only when necessary D . be coated with certain material

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• “Pipe in mouth” in the sentence “The old man stood under a big tree, pipe in mouth” can also be in the form of “with a pipe in his mouth”.

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• All items such as steam pipes, exhaust pipes and fittings which, because of their location and operating temperature, present a hazard should be adequately laggedThat means the items should .

  A.not be put into operation too early B.be pay adequate attention to C.be used only when necessary D.be coated with certain material

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• In order to use the water from the stove, there be a pipe connecting the tub with the stove.

  [A] must [B] seemed to [C] needn't [D] should

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