Black smoke exhausting from a diesel engine indicates（）

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

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• White smoke exhausting from a diesel engine can be caused by （）

  A . low combustion temperature B . a leaking fuel nozzle check valve C . late fuel injection D . plugged oil-scraper ring hole

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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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  A . A、singly B . B、apiece C . C、set D . D、sets

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• White smoke exhausting from an operating diesel engine may indicate （）.

  A . a cracked liner B . burning lube oil C . an overloaded engine D . insufficient combustion air

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• A smoking exhaust from an operating diesel engine could be caused by （）

  A . low sulfur content in the fuel B . a loose injector inlet connection C . late fuel injection D . high injection pressure

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• Black smoke exhausting from an operating diesel engine is an indication of poor combustion which may be caused by （）

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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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• 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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• Black smoke exhausting from an operating diesel engine can be caused by （）

  A . fuel dribbling from leaking fuel injectors B . burning fuel with a high carbon content C . burning fuel with a high vanadium content D . burning fuel with a lower sulphur content

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• A diesel engine emits blue exhaust smoke as a result of（）

  A . cold intake air B . excessive compression pressure C . excessive cylinder lubrication D . a light load

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• A four-stroke cycle, turbocharged, 1000 horsepower diesel engine has been operating under loadThe load suddenly increases, causing excessive black exhaust smoke, and a rapid rise in the lube oil temperatureIn response to this condition, you should:（）

  A . reduce load B . check your exhaust C . adjust cooling water temperature D . increase lube oil flow

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• Leaky exhaust valve will result in which of the following?（） (1) high exhaust temperature; (2) low compression pressure; (3) low firing pressure.

  A . (1) and (2) B . (1) only C . (2) only D . (1),(2) and (3)

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• 热衰竭(heat exhaustion)

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• Diesel engine exhaust noise can be reduced in an exhaust muffler by （）

  A . changing the direction of exhaust gas flow B . increasing the exhaust gas velocity C . changing the exhaust gas weight D . increasing the exhaust gas static pressure

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• A diesel engine experiences a sudden loss in speed, accompanied by black exhaust smoke, with the fuel rack at maximum, and speed remaining below normal the probable（）

  A . engine overload B . leaky valves C . stuck or broken piston rings D . low air injection pressure

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• ______, I rock to and fro on the swing. I'm feeling lonely. I wish I had someone to play with.

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• 英译汉：He stopped smoking.英译汉：He stopped smoking.

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• exhaust（）

  A．布料，织物 B．使筋疲力尽；耗尽 C．打破，破碎；缝隙 D．求婚

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• ______, I rock to and fro on the swing.I’m feeling lonely.I wish I had someone to

  A．A.I&39;m feeling lonely.I wish I had someone to play wit B．B.Joyfully C．C.Listlessly D．D.Anxiously E．E.Delightedly

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• exhaustive（）

  A．全面的 B．费力的 C．有趣的 D．忍心的

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