This test can be completed with the help of the textbooks and notebooks. All of the test should be finished in English.
The following data may be uful for your tests.
1. Molecular weight
air =29, toluene=92, acetone=58, benzene = 78
2. Conversion factors
K=℃+273 1 feet=0.3048m 1cp=0.001kg/m·s 1atm=1.013×105Pa 1lbm = 0.4359kg
3.The properties of air in the standard conditions (20℃, 1 atm)and other constants
air viscosity: μ=0.018cp
air density: ρ＝1.204kg/m3
acceleration of gravity : g=9.8m/s2
百衲衣
universal gas constant: R=8.314J/mol·K
This test can be completed with the help of the textbooks and notebooks. All of the test should be finished in English.
The following data may be uful for your tests.
1. Molecular weight
air =29, toluene=92, acetone=58, benzene = 78
2. Conversion factors
K=℃+273 1 feet=0.3048m 1cp=0.001kg/m·s 1atm=1.013×105Pa 1lbm = 0.4359kg
3.The properties of air in the standard conditions (20℃, 1 atm)and other constants
air viscosity: μ=0.018cp
air density: ρ＝1.204kg/m3
acceleration of gravity : g=9.8m/s2
universal gas constant: R=8.314J/mol·K
Part A 爱怎么说
Directions: You must give the definitions of the following terms, using simple and reasonable expressions. (2’×5). Score scientificamerican
1.Separation number
2. Adiabatic lap rate
3. Plume ri
4. Drag coefficiency
5. Prompt NO
Part B
Directions: You must give the answers for the following questions, with simple and reasonable sayings. (2’×9). Score
1. What is the schematic of air pollution process?
2. How to explain air pollution effects on visibility?
3. What are the three alternatives for air pollution control?
4. Plea explain the particles collection mechanisms of ESP.
5. How to Control VOCs?
6. What is the basic idea of wall collection device?
7. How does global warming take place?
8. Plea explain the major differences between SOx and NOx as pollutants.
9. How does the temperature inversion take place, and what are the harmful effects of temperature inversions?
Part C
Directions: In Part C you will give the answers in detail according to the requirements of each question.(8’+8’+6’). Score
1. Plea give the derivation of efficiency equation for block flow in gravity ttlers.
2. Plea explain the particles collection mechanisms of the surface filter, depth filter
3. Plea explain the sources of Sulfur pollution and their control methods.
Part D
Directions: There are 30 questions. You will read the questions and all of the answers carefully. Then you must fill the right answer in the blankets. Being careful that each question has one or more right answers(1’×30). Score
1. The four major air pollutants are ( )
A. CO2 B. VOCs C. SOx D. NOx E. ozone(O3) F. particulate pollutants
2. Which of abbreviations have the relationship with U.S air pollution laws and regulations? ( )
A. EPA B. NAAQs C. LEL D. UEL E. ACGIH
3. In one city, concentration of the three major air pollutants are shown as following: SO2: 0.105mg/Nm
3; NO2: 0.080mg/Nm3; PM10: 0.250mg/Nm3. What is the API of this city? ( )
A. 165 B. 76 C. 50 D. 200 E. 150 F. 100
API | Air Pollutants Concentration（mg/Nm3） |
SO2 （average a day） | NO2 （average a day） | PM10 （average a day） | CO （average a hour） | O3 jingle bell（average a hour） |
50 | 0.050 | 0.080 | 0.050 | 5 | 0.120 |
100 | 0.150 | 0.120 | 0.150 | 10 | un是什么意思 0.200 |
200 | 0.800 | 0.280 | 0.350 | 60 | 0.400 |
300 | 1.600 | 0.565 | 0.420 | 90 | 0.800 mpt |
400 | 2.100 | 英文学校0.750 | 0.500 | 120 | 1.000 |
500 | 2.620 | 0.940 | 0.600 | 150 | 1.200 |
| | | | | |
4. In the following figure, the actual lap rate is shown as a solid line, whereas the adiabatic lap rate is shown as the dashed line. Which following description about the atmospheric stability is correct according to the figure. ( )
5. Which of the following meteorological conditions can cau high ground-level pollutant concentrations near the ground-level or low-level sources? ( )
A. Unstable atmosphere B. Stable atmosphere C. Temperature inversion D. Strong solar radiation
6. We have test a plant’s emission of particles from the same ction and found the following data.
Sample number | Sample time, min | Stack velocity, ft/s | 词根词缀大全Particle concentration, g/m3 |
1 | 英语国际音标教学视频10 | 50 | 0.5 |
2 | 20 | 60 | 0.3 |
汉译英软件3 | 30 | 40 | 0.7 |
| | | |
What was the average particle concentration in this stack over the whole 50min of the test? ( )
A. 0.468g/m3 B. 0.500g/m3 C. 0.473g/m3 D. 1.420g/m3 E. 0.030g/m3
7. In the fixed models, pollutants only leave or enter through which ction of the boxes? ( )
A. ABCD ction B. AEHD ction C.DCGH ction
