The ash content of a fuel oil is significant to the operating engineer because it （）

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• If the analysis of used lube oil indicates a high content of iron particles, this could indicate（）

  A . corrosive deterioration of a bearing B . inadequate air filtration C . excessive ring and liner wear D . excessive cooling of lubricating oil

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• The burning of fuel oil in a diesel engine having a high sodium content, will cause （）

  A . corrosion and grooving of exhaust valves B . corrosion and gumming of the fuel injection pump C . salt deposits in the exhaust manifold D . slag deposits in the fuel injection equipment

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• Heavy fuel oils generally have an upper average ash content of 0~1% by weight.Which of the following conditions could be expected if the ash content increase above this amount?（）

  A . Glazing of the cylinder liners B . Increase valve wear C . Excessive oil pumping D . Increase fuel consumptio

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• The amount of fuel delivered by a unit injector is controlled by the （）

  A . camshaft B . main spring C . rack position D . nozzle orifice size

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• The ignition quality of a diesel fuel is indicated by the （）

  A . cetane number B . volatility point C . viscosity index D . octane number

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• Which of the following statements describes the results of excessive microbiological growths within a fuel system?（）

  A . all excessive amounts of growth will cause the main engines of the vessel to stall due to the inability to supply the proper quantities of fuel to satisfy the existing load B . The deposits produced by these growths form blockages and flow restrictions ultimately leading to improper atomization of the fuel into the cylinders C . Eventually the growth of these organisms will deplete the supply of food available to them, which in turn will cause their demise D . If continual growth is permitted, a sweet odor similar to that associated with baking will be noticed when system components are opened for inspectio

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• The desirable properties of a marine fuel oil should include（）

  A . high flash point and high viscosity B . low flash point and high viscosity C . low heating value and high sulphur content D . high heating value and low sulphur content

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• Increasing the temperature of a fuel will reduce its （）.

  A . viscosity B . pressure C . resistance D . setting point

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• Burning fuel with a high sulfur content in a diesel engine will （）

  A . increase thermal efficiency B . cause clogging of the fuel system C . increase the ability of the engine to start in cold weather D . produce corrosion in the cylinder and exhaust system at low load

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• When fuel enters the crankcase of a diesel engine, it （）

  A . dilutes the lube oil and reduces its viscosity B . forms sulfuric acid in the lube oil C . causes pitting and failure of the bearings D . causes sludge deposits on valve stem

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• The needle valve in a fuel valve will （） when the fuel pressure action on the needle valve tapered face exerts a force lower than that of the spring compression.

  A . be jammed B . be opened C . be seated D . be broke

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• Which of the listed factors will indicate the most about the ability of a fuel to ignite in a diesel engine?（）

  A . Viscosity B . Sulfur content C . Pour point D . Cetane number

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• The cetane number of a diesel fuel oil indicates its（）

  A . Viscosity B . acid content C . heating value D . ignition quality

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• The specific gravity of fuel oil is a （）.

  A . absolute value B . relative value C . constant value D . set value

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• Which of the following problems may occur when using fuel oil with a high sulphur content?（）

  A . Injection lag B . Lube oil dilution C . Pre-ignition D . Corrosio

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• Air in the fuel lines to the fuel injection nozzles of a diesel will result in （）.

  A . lower compression pressures B . overheating without smoking C . failure to start D . a run away without load

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• The cylinder contains a great weight of air and is capable of burning a great quantity of fuel at（）.

  A . the beginning of the compression stroke B . the beginning of the suction stroke C . the end of the working stroke D . the end of the exhaust stroke

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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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• The consistent burning of fuel oil with a high sulfur content in a diesel engine will result in （）

  A . clogged fuel injection pumps B . increased cylinder liner wear C . intake valve stem corrosion D . varnish deposit on pisto

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• The fuel tank has a ( ) of 50 litres.

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• S phase is the period when the contents of a cell are actually divided.

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• The purpose of the ashing step in graphite-furnace atomic-absorption spectroscopy is to（) A．vapor

  The purpose of the ashing step in graphite-furnace atomic-absorption spectroscopy is to( ) A．vaporize metal atoms to be analyzed B．cause the metal species to form carbides which are more volatile C．convert the graphite furnace to ash to avoid carbide formation D．burn off organic species that would interfere with the eletnental analysls

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• Neither the teacher nor the students are ____ with the result of the exam. A contentB contentedC satisfyingD contenting

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• ______ is the name of a Cambridge-based company that is trying to create the kind of computer which might receive the contents of a brain.

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