Daily Safety Technology Quiz (Single-choice Question) (2016.9.1)
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The last edit to this post was made by 68589544 on 2016-9-4 at 00:38. 1. Which of the following statements regarding precautions for fighting fires involving special chemicals is correct? ____ A. When extinguishing fires involving liquefied gases, it is necessary to first put out the flames and then take measures to seal any leaks； B. To extinguish **material** fires, it is necessary to cover them with sand ； C. For fires involving moisture-sensitive flammable materials, foam, acid-base extinguishing agents, etc. should be used to put out the fire ； D. When fighting fires involving toxic or corrosive substances, low-pressure water streams or mist should be used as much as possible. 2. Before maintenance, the improper safety procedures to be followed after shutting down the equipment (such as isolation, displacement, purging, and cleaning) are: ____ A. Blind plates should have large lugs and be painted in a distinctive color for labeling and identification ； B. Whenever working in no-fire zones or when removing or installing blind flanges on windows or pipes that carry flammable and explosive materials, explosion-proof tools and lighting must be used. Lighting is strictly prohibited within the designated areas, and a dedicated person should be assigned to conduct regular inspections and supervision during the work ； C. After the equipment has been purged, if it is necessary to work inside it, the inert gas must be replaced with air again to prevent maintenance personnel from suffocating ； D. If the specific gravity of the displacing medium is greater than that of the medium to be displaced, the displacing medium should be introduced at the highest point of the equipment or pipeline, while the medium to be displaced should be discharged from the lowest point. Sampling points should be located at the top and in areas where dead zones may form ； The correct answers are: D;D
D. When fighting fires involving toxic or corrosive substances, low-pressure water streams or mist should be used as much as possible. A. Blind plates should have large lugs and be painted in a special color for labeling and identification ；
1，D. -----2, D.
Which of the following statements regarding precautions for fighting fires involving special chemicals is correct? _D___ A. When fighting fires involving liquefied gases, it is necessary to extinguish the flames first, and then take measures to seal any leaks； B. To extinguish **material** fires, it is necessary to cover them with sand ； C. For fires involving moisture-sensitive flammable materials, foam, acid-base extinguishing agents, etc. should be used to put out the fire ； D. When fighting fires involving toxic or corrosive substances, low-pressure water streams or mist should be used as much as possible. 2. Regarding the proper safety procedures to be followed before maintenance, after the equipment is shut down (such as isolation, displacement, purging, and cleaning), the incorrect practice is: _D___ A. Blind flanges should have large lugs and be painted in a distinctive color for labeling and identification ； B. Whenever working in no-fire zones or when removing or installing blind flanges on windows or pipes that carry flammable and explosive materials, explosion-proof tools and lighting must be used. Lighting is strictly prohibited within the designated areas, and a dedicated person should be assigned to conduct regular inspections and supervision during the work ； C. After the equipment has been purged, if it is necessary to work inside it, the inert gas must be replaced with air again to prevent maintenance personnel from suffocating ； D. If the specific gravity of the displacing medium is greater than that of the medium to be displaced, the displacing medium should be introduced at the highest point of the equipment or pipeline, while the medium to be displaced should be discharged from the lowest point. Sampling points should be located at the top and in areas where dead zones may form ；