問題詳情

V. Reading Comprehension (6%; 2% each)When a mass of solid flammable material is heated it burns away slowly owing to the limited surface area exposed to theoxygen of the air. The energy produced is liberated gradually and harmlessly because it is dissipated as quickly as it is released.The result is quite different if the same mass of material is grounded to a fine powder and intimately mixed with air in the formof a dust cloud. In these conditions the surface area exposed to the air is very great and if ignition now occurs, the whole of thematerial will burn with great rapidity; the energy, which in the case of the mass was liberated gradually and harmlessly, is nowreleased suddenly with the evolution of large quantities of heat and, as a rule, gaseous reaction products.Although an intimate mixture of a flammable dust and air may burn with explosive violence, not all mixtures will do so.There is a range of concentrations of the dust and air within which the mixture can explode, but mixtures above or below thisrange cannot. The lowest concentration of dust capable of exploding is referred to as the lower explosive limit and theconcentration above which an explosion will not take place as the upper explosive limit. The lower explosive limits of manymaterials have been measured. They vary from 10 grams per cubic metre to about 500 grams per cubic metre. For mostpractical purposes it may be assumed that 30 grams per cubic metre is the lower explosive limit for most flammable dusts.Though this may seem to be a very low concentration, in appearance a cloud of dust of such a concentration would resemble avery dense fog. The upper explosive limits are not well defined and have poor repeatability under laboratory test conditions.Since the upper explosive limit is of little practical importance, data for this parameter is rarely available. The most violentexplosions are produced when the proportion of oxygen present is not far removed from that which will result in completecombustion. The range of the explosive concentrations of a dust cloud is not simply a function of the chemical composition ofthe dust; the limits vary with the size and shape of the particles in the dust cloudThe heat produced by the combustion of the dust particles in a dust explosion and any gases evolved will cause a rapidincrease in pressure at the walls of the vessel containing the dust cloud. In factories it is the effect of this pressure wave onrelatively weak items of plant and buildings which has caused the deaths and injuries to persons employed in handling materialsgiving rise to dust explosions. Further, since the pressure wave produced by the explosion can cause further dust which mayhave accumulated in the plant or on internal surfaces of buildings to be thrown into suspension in air, additional fuel can be fedto the flame and a disastrous secondary explosion may follow. Additional consequences following a dust explosion pressurewave are: the fires that may have been started by the dust flame; the implosion effect on the plant and buildings as the pressurewithin these rapidly returns to normal.
48. According to article, which of the following cases will be considered relatively harmless?
(A)When a mass of solid materials is grounded into a fine powder and intimately mixed with air in the form of dust cloud.
(B) When a mass of materials is released rapidly with ignition.
(C) When a mass of materials is dissipated with gaseous effect.
(D) When a mass of solid materials is heated gradually and slowly.

參考答案

答案：D
難度：困難0.384615
統計：A(4),B(5),C(5),D(10),E(0)

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