A dry-type exhaust muffler clogged with soot, will cause（）

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

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

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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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• An exhaust gas bypass is installed on a waste heat boiler in order to （）.

  A . bypass exhaust gas at high loads to prevent excessive back pressure B . bypass a portion of the exhaust gas at peak loads for better efficiency C . recycle exhaust gas to the turbocharger D . minimize moisture condensation in the boiler gas passages at low load

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• A patient suffering from heat exhaustion should be（）.

  A . moved to a cool room and told to lie down B . kept standing and encouraged to walk slowly and continuously C . given a glass of water and told to return to work after 15 minutes of rest D . None of the above are correct

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• High firing pressures and a low exhaust temperature in a diesel engine may result from （）.

  A . decreased piston to cylinder head clearance B . increased exhaust system back pressure C . early fuel injection timing D . low scavenge air temperature

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• If a diesel engines exhaust temperature is abnormally high, the cause could be（）

  A . too light of a load B . injection timing is too early C . overloading of the engine D . too low of a compression ratio

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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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• A dark exhaust from a running diesel engine can be caused by （）

  A . late ignition B . water in the fuel C . high compression temperature D . starting valve stuck ope

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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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• 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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• A water jacket is placed around the exhaust manifolds of propulsion diesel engines to（）

  A . reduce heat radiation to the engine room B . aid in preventing turbocharger overheating C . condense and drain moisture from exhaust gases D . dampen exhaust gas pulsations in the manifold

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• A dry-type spark arrestor removes sparks from a diesel engine exhaust by（）

  A . increasing the linear velocity of the exhaust gases B . changing directions of exhaust gas flow C . decreasing the temperature of the exhaust gases D . accelerating the exhaust gas through a reduced size orifice

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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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• For a diesel engine, individual cylinder performance is commonly determined by exhaust gas（）

  A . chemical analysis B . back pressure readings C . pyrometer readings D . infrared analysi

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• Black smoke exhausting from a diesel engine indicates（）

  A . proper fuel injection B . water in the fuel C . incomplete combustion D . burning of lube oil

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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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• Clogged or partially obstructed exhaust ports on a diesel engine can cause（）

  A . over-speeding of the engine B . failure of the engine to shut down C . no effect of engine mounting bolts D . high exhaust temperature

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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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• In comparing engines of equal horsepower, higher exhaust gas temperatures occur in a/an（）

  A . opposed-piston engine B . double-acting engine C . two-stroke/cycle engine D . four-stroke/cycle engine

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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 built-up exhaust valve is one in which （）.

  A . the stem and heads are made of different material B . low-alloy steel is used throughout C . a replaceable valve disk is welded to the head D . the self-centering action comes from motion of the valve stem in the guide

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• Diesel engine mufflers or silencers reduce the engine exhaust noise by （）

  A . passing the exhaust through long head pipes B . diffusing exhaust vibrations through activated carbon baffles C . increasing the exhaust gas velocity D . reducing the exhaust gas velocity

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• After a long and exhausting journey they arrived ________.

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• If a diesel engine were running at 20% overload with a smoky exhaust, you should_____.

  A.stop the engine immediately to prevent damage B.increase lube oil pressure C.slow the engine allowing it to gradually cool D.decrease the cooling water it temperature to the water jacket

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