Combustion gases formed in the cylinder of a diesel engine are prevented from blowing past the piston by （）

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• Which of the following forms of energy is demonstrated through the process of combustion?（）

  A . Chemical energy B . Mechanical energy C . Thermal energy D . Electrical energy

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• In motor ship, （） is often used to recover some of the heat carried in the exhaust gases from the main engine.

  A . an diesel oil heater B . a waste heat boiler C . a fresh water generator D . all the above

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• A fire starting by spontaneous combustion can be expected in which condition?（）.

  A . Paints，varnish，or other liquid flammables are stowed in a dry stores locker B . Inert cargoes such as pig iron are loaded in a wet condition C . Oily rags are stowed in a metal pail D . Clean mattresses are stored in contact with an electric light bul

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• Each cylinder in a two stroke cycle engine experiences combustion（）.

  A . once each crankshaft revolution B . twice each crankshaft revolution C . every other crankshaft revolution D . every fourth stroke

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• When the fuel oil is burning in the combustion chamber, it （）.

  A . gives up large amount of heat B . gives off large amount of heat C . gives up large amount of steam D . gives off large amount of steam

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• Proper atomization of fuel in diesel engine combustion chambers will （）.

  A . affect the injection pressure B . improve combustion C . reduce compression pressure D . decrease power output

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• The atmosphere（）certain gases mixed together in definite proportions.

  A . composes of B . is made up C . consists of D . makesup of

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• The process to remove exhaust gases by blowing in fresh air is called （）.

  A . charging B . supercharging C . starting D . scavenging

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• Diesel engine blow-by is the leakage of combustion gases past the （）

  A . oil rings only B . compression and scraper rings C . cylinder liner sealings D . cylinder liner ring groove

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• The cylinder head, cylinder liner and （） form the combustion chamber.

  A . frame B . piston C . crankcase D . explosion plate

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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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• Theoretical perfect combustion in a diesel engine yields by-products of （）.

  A . aldehydes and carbon dioxide B . water vapor and carbon monoxide C . nitrogen and carbon monoxide D . water vapor and carbon dioxide

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• Poor combustion in a diesel engine can be caused by （）.

  A . high compression pressure B . low intake air temperature C . low exhaust pressure D . high scavenge air pressure

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• Combustion knock occurring in a diesel engine can be caused by （）

  A . low coolant temperature B . insufficient fuel C . high ambient temperature D . carbon buildup on the injector ti

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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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• What determines the number of events occurring in a cycle of operation in an internal combustion engine?（）

  A . Crankshaft revolution B . Type of engine (diesel or gasoline) C . Distance a piston travels during a stroke D . Number of pisto

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• The fuel injector injects a fine spray of fuel into the hot air and combustion （）, producing much high pressure in the gases.

  A . has begun B . takes place C . occurs D . happe

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• Proper combustion in a boiler would be indicated by （）.

  A . yellowish flame B . golden yellow flame C . white flame D . brilliant white flame

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• Which of the lists forms of heat transfer, if any, is illustrated by the flow of combustion gases through a boiler?（）

  A . Natural convection only B . Forced convection only C . Both natural convection and forced convection D . None

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• Spontaneous combustion could occur in（）

  A . paint thinner in an open can B . fuel accumulation in the bilge C . oily rags in an unvented compartment D . gasoline stored in steel drum

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• The two most common gases used in pneumatic system are （）

  A、compressed air and nitrogen B、helium and nitrogen. C、oxygen and hydrogen D、oxygen and acetylene

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• ______ involves transforming gases, liquids, and solid elements by chemical and physical means. where atoms and molecules are combined to form solid materials.

  A) Analysis B) Processing C) Synthesis D) Wroughting

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