东北大学15春学期《工业通风与除尘》在线作业1（Northeast university 15 spring semester industrial ventilation and dusting online work 1）.doc

东北大学15春学期《工业通风与除尘》在线作业1（Northeast university 15 spring semester industrial ventilation and dusting online work 1） Industrial ventilation and dusting online assignment 1 (10 questions, 40 points.) 1. In the ventilation room, regardless of the ventilation method, the air quantity entering the room should be equal to the amount of air discharged, i.e. the air volume of the ventilated room should be balanced. A. mistakes B. right The answer is: * * * * * 2. The total pressure and static pressure of the fan pressure are positive. A. mistakes B. right The answer is: * * * * * 3. The exhaust air must be guaranteed by the frequently used exhaust system or the emergency ventilation system. A. mistakes B. right The answer is: * * * * * 4. The concentration of harmful substances in outdoor air should not exceed 30% of the maximum allowable concentration of indoor operation. A. mistakes B. right The answer is: * * * * * 5. The wind pressure of the fan is equal to the resistance of the air duct and the combined loss of the outlet dynamic pressure. A. mistakes B. right The answer is: * * * * * 6. The larger the dust particle size, the greater the harm to the human body. A. mistakes B. right The answer is: * * * * * The dust-dust efficiency is the same when the two models are running in tandem. A. mistakes B. right The answer is: * * * * * 8. The fine dust itself does not have the ability of independent movement, and the energy of a dusting is not enough to disperse the dust. A. mistakes B. right The answer is: * * * * * 9. The classification of high suspension and low overhang in the receiving cover is only related to the height of the cover. A. mistakes B. right The answer: * * * * 10. The ratio of the ventilator is the relation between the wind volume, wind pressure and the rotation speed in the maximum efficiency, that is, the standard fan produces a total pressure of 1Pa under optimal conditions. A. mistakes B. right The answer is: * * * * * 15 spring semester industrial vent