The diesel engine exhaust gas bypass, as fitted with some waste heat boilers, is installed to （）

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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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• 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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• 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 two-stroke diesel engine exhaust temperature will be lower than a four-stroke diesel engine of the same displacement because the （） (1) MEP is lower and the scavenging air is cooling the exhaust gases (2) valve overlap in a four-stroke

  A . (1) only is correct B . (2) only is correct C . both (1) and (2) are correct D . Neither (1) or (2) are correct

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• Exhaust gases are generally removed from the cylinders of a two-stroke/cycle diesel engine by（）

  A . natural aspiration B . masked intake valves C . air cells D . scavenging air

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• The exhaust gases in a supercharged two-stroke/cycle diesel engine are expelled from the cylinder by （）

  A . pumping action of the piston B . pressure of the fuel charge C . vacuum developed in the manifold D . pressure of the fresh air charge

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• A diesel engine is warmed up and white vapor is in the exhaust，this could indicate （）

  A . excessive cylinder lubrication B . a lugging engine C . a leaking cylinder liner D . overloading of one cylinder

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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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• 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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• The working cycle of a four-stroke diesel engine consists of four events:（） (1) compression (2) expansion (3) exhaust (4) suctionThe correct sequence is

  A . (4)-(2)-(3)-(1) B . (4)-(3)-(1)-(2) C . (4)-(3)-(2)-(1) D . (4)-(1)-(2)-(3)

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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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• The opening of an exhaust valve on a modem, large, low-speed, main propulsion diesel engine may be actuated by （）.

  A . direct action of cam shaft B . compressed air pressure C . hydraulic “push rods” D . direct action of the main piston moving dow

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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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• 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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• For an ordinary four-stroke diesel engine the exhaust valves close （）.

  A . after TDC B . before TDC C . after BDC D . before BDC

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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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• In a diesel engine, exhaust valves open before the intake ports are uncovered to （） Ⅰ.reduce pumping losses Ⅱ.reduce back pressure

  A . Ⅰonly B . Ⅱonly C . bothⅠand Ⅱ D . neitherⅠnor Ⅱ

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• The most common instrument used to measure diesel engine exhaust pressure is the （）

  A . pyrometer B . bourdon gauge C . pneumercator D . manometer

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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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• The operating diesel generators will have their exhaust temperatures, cooling water and lubricating oil temperatures and pressures （） in much the same way as for the main engine.

  A . to be kept B . logged C . changed D . has remained

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• In a two-stroke/cycle diesel engine, the exhaust gases are expelled from the cylinder by the（）

  A . exhaust manifold B . valve bridge C . pressure of the fresh air charge D . valve adjusting gear

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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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• The four strokes of a four-stroke diesel engine according to their sequence are :suction,compression,expansion and exhaust.()

  此题为判断题(对，错)。

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