The color of the exhaust from a diesel engine should be （）

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• The exhaust boilers are used to recover some of （） carried in the exhaust gas from the main engine.

  A . water B . oil C . heat D . steam

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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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• Exhaust pyrometer readings provide an indication of the （）

  A . effectiveness of water-cooled exhaust elbows B . distribution of the load between engine cylinders C . amount of fuel penetration into the engine cylinders D . indicated horsepower of the engine cylinder

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• The tops of the thwarts，side benches，and the footings of a lifeboat are painted which color?（）

  A . International orange B . Yellow C . White D . Red

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• Engine operating conditions may be indicated by the color of the exhaust smoke.Black smoke could indicate（）

  A . an insufficient speed droop setting B . an overloaded engine C . clogged drain holes in the oil control rings D . complete combustio

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• The high air velocity leaving the compressor of an exhaust gas turbocharger is converted to pressure in the （）

  A . inlet nozzle ring B . turbine wheel blade C . diffuser passages D . inlet vol

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• （） is the removal of exhaust gases by blowing in fresh air.

  A . Gas exchange B . Charging C . Scavenging D . Supercharging

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• One of the purposes for water cooling the exhaust manifold in marine diesel engine is to （）

  A . reduce lube oil temperature B . raise exhaust temperature reduce C . excessive heating of engine room D . reduce load on cooling water pum

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• A two-stroke diesel engine exhaust temperature will be lower than a four-stroke diesel engine of the same displacement because the （） (1) scavenging air is cooling the exhaust gases (2) exhaust cycle time is longer

  A . (1) only B . (2) only C . both (1) and (2) D . neither (1) nor (2)

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• The quantity of cooled air delivered by an air conditioning unit should （） the sum of the quantity of air re-circulated to the unit and the quantity mechanically exhausted.

  A . balance B . not balance C . be more than D . be less tha

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• The satisfactory operation of diesel engine exhaust valves usually depends on（）

  A . the proper back pressure B . the cooling water temperature C . correct timing and proper seating D . accurate metering and the exhaust temperature

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• In the （） pressure charging system the pulse of energy that occur as the exhaust is released from the cylinder to improve the output of the turbocharger.

  A . constant B . pulse C . high D . none of the above

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• How would the exhaust of a properly operating diesel engine appear?（）.

  A . Light blue haze B . Light brown haze C . Light gray haze D . Perfectly clear

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• The hot expanding gas rotates the blades of the exhaust turbine, thus giving out large part of its power, which drives （）.

  A . the oil separator B . the fresh water generator C . the compressor D . fire pum

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• In a diesel engine exhaust system, the cooling of the exhaust gases below their dew point, will result in （）

  A . increased engine back pressure B . sulfuric acid corrosion C . surface pitting of the turbocharger D . moisture impingement on the turbocharger compressor blade

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• Forcing the exhaust gases form the cylinder of an operating diesel engine with the aid of a blower is known as （）

  A . scavenging B . forced draft C . turbo-charging D . aspiratio

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• The hot expanding gas rotates the blades of the exhaust turbine, thus （） a large of its power, （） drives the compressor.

  A . to give off；which B . giving off；which C . to give off；that D . giving off；that

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• The color of the skirt does not （） that of the coat.

  A . balance B . match C . corresponding D . accord

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

  A . too great a loading B . fouled turbocharger C . bad combustion D . excessive air

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• The perception of color is a function of the （0.5分）

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• Mongolians believe that the color white symbolizes the origin of everything.

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• Which is not the symbolization of the golden color?

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• It is the movement,not the color,of objects that excitesthe bull（）

  A．frightens B．scares C．arouses D．confuses

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• These pairs of shoes （） not of the same color.

  A．is, B．are

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