【Test Your Knowledge】Basic Chemical Engineering Knowledge (19)
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1 The causes of fluid resistance are ______ and _______, _______________. 2 Under normal circumstances, when the concentration of nitrogen oxides exceeds ___________, it can cause chest pain; when the concentration reaches ______________, it can lead to pulmonary edema and even death from acute poisoning. 3 A three-phase power supply in which the frequency of the alternating current is altered through ___________, thereby changing the speed of the motor, is called ___________________. 4 The oil level in the vacuum pump’s crankcase should be maintained at _________ level, and the dripping rate of the cylinder oil reservoir should be __________________ drops per minute. 5 The evaporation rate is related to ___________, ___________, and ___________. 6 In a dilute acid solution, as the pH value increases, the acidity of the solution ________. A. Increase B. Decrease C. Not necessarily D. Remain unchanged Filter-type gas masks are used for ammonia gas with ________. A. Yellow B. Brown C. Black D. Green 8 In the reaction in which hydrogen and oxygen combine to form water, 8 g of hydrogen reacts completely with oxygen; what is the mass of oxygen? A. 38g B. 32g C. 48g D. 64g What should happen to a diaphragm control valve when the compressed air supply is interrupted? A. Shut down immediately B. Remain in place C. Turn on immediately D. Stop adjusting. The suction height of pump 10 has a limit, and it is related to the local atmospheric pressure as well as the ________ of the liquid. A. Mass B. Density C. Volume D. Flow rate Answer key: 1 Internal friction, flow state, roughness of the pipe walls, pipe length, and pipe diameter 2 25 mg/Nm3, 100–200 mg/Nm3 3 Inverter, variable frequency speed control 4 2/3, 10–20 5 Temperature, pressure, vapor pressure 6. B ； 7.A ； 8.D ； 9.A ； 10.B ； Did you get it right? This post was last edited by zhangyong6404 on 2009-4-2 14:30.]
1 Fluid viscosity 4 1/3 60 5 Temperature, pressure, concentration 6B Grayish-white or white 8D A 10B
1 The causes of fluid resistance are ___internal friction caused by viscosity___ and _____local resistance__，_____________. 5 The evaporation rate is related to the ____heat load_______, ____T_______, and ______P_____. 6 In a dilute acid solution, as the pH value increases, the acidity of the solution ___B_____ . A. Increase B. Decrease C. Not necessarily D. Remain unchanged 7 For filter-type gas masks, ammonia gas should be handled using __B______. A. Yellow B. Brown C. Black D. Green 8 In the reaction in which hydrogen and oxygen combine to form water, 8 g of hydrogen reacts completely with oxygen; the mass of oxygen is ___D______. A. 38g B. 32g C. 48g D. 64g When compressed air supply is interrupted, a 9-port diaphragm control valve should ___C______. A. Shut down immediately B. Remain in place C. Turn on immediately D. Stop adjusting. The suction height of pump 10 has a limit, and it is related to the local atmospheric pressure and the ___B_____ of the liquid. A. Mass B. Density C. Volume D. Flow rate
1 The causes of fluid resistance are __fluid viscosity____ and _______, _______, as well as local resistance________. 2 Under normal circumstances, when the concentration of nitrogen oxides exceeds ____1.0 milligrams per cubic meter_______, it can cause chest pain; when the concentration reaches ____5.0 milligrams per cubic meter________, it can lead to pulmonary edema and even death from acute poisoning. 3 A three-phase power supply in which the frequency of the alternating current is altered through ___________, thereby changing the speed of the motor, is called ___________________. 4 The oil level in the vacuum pump’s crankcase should be maintained at the _____specified_____ level, and the dripping rate of the oil in the cylinder oil cups should be __________________ drops per minute. 5 The evaporation rate is related to ____temperature_______, _____pressure______ and ___________. 6 In a dilute acid solution, as the pH value increases, the acidity of the solution __d______. A. Increase B. Decrease C. Not necessarily D. Remain unchanged For filter-type gas masks, ammonia gas is handled using ____a____. A. Yellow B. Brown C. Black D. Green 8 In the reaction in which hydrogen and oxygen combine to form water, 8 g of hydrogen reacts completely with oxygen; the mass of oxygen is ____d____. A. 38g B. 32g C. 48g D. 64g When compressed air is interrupted, a diaphragm control valve should ____c____. A. Shut down immediately B. Remain in place C. Turn on immediately D. Stop adjusting. The suction height of pump 10 has a limit, and it is related to the local atmospheric pressure and the ____b____ of the liquid. A. Mass B. Density C. Volume D. Flow rate. It’s a bit difficult; there are so many things I don’t know
1 The causes of fluid resistance are ___fluid viscosity___, ____flow velocity___, and ___pipe wall roughness____. 2 Under normal circumstances, when the concentration of nitrogen oxides exceeds _____50mg/m3_____, it can cause chest pain; when the concentration reaches _____400-600mg/m3_______, it can lead to pulmonary edema and even death due to acute poisoning. 3 A three-phase power supply has its alternating current frequency altered through an _inverter_, thereby changing the speed of the motor; this is known as __variable frequency speed control____. 4 The oil level in the vacuum pump’s crankcase should be maintained at ___2/3______ of the capacity, and the dripping rate of oil from the cylinder oil cups should be _10-20_ drops per minute. 5 The evaporation rate is related to the ____heat load__、___evaporation temperature__ and __system pressure___. 6 In a dilute acid solution, as the pH value increases, the acidity of the solution ___B__. A. Increase B. Decrease C. Not necessarily D. Remain unchanged 7 For filter-type gas masks, ammonia gas should be handled using ___A_____. A. Yellow B. Brown C. Black D. Green 8 In the reaction in which hydrogen and oxygen combine to form water, 8 g of hydrogen reacts completely with oxygen; the mass of oxygen is ____D____. A. 38g B. 32g C. 48g D. 64g When compressed air supply is interrupted, a 9-port diaphragm control valve should ___A_____. A. Shut down immediately B. Remain in place C. Turn on immediately D. Stop adjusting. The suction height of pump 10 has a limit, and it is related to the local atmospheric pressure and the ____B____ of the liquid. A. Mass B. Density C. Volume D. Flow rate
1 Reasons for fluid resistance: _fluid viscosity_____ and _fluid velocity______, __boundary friction_____________. 2 Under normal circumstances, when the concentration of nitrogen oxides exceeds ___5ppm________, it can cause chest pain; when the concentration reaches ___100ppm_________, it can lead to pulmonary edema and even death from acute poisoning. 3 A three-phase power supply has its alternating current frequency altered through a __inverter_________, thereby changing the speed of the motor; this is known as ___variable-frequency speed control______________. 4 The oil level in the vacuum pump’s crankcase should be maintained at the __specified_______ level, and the dripping rate of the oil in the cylinder cups should be __30______________ drops per minute. 5 The evaporation rate is related to the __saturation vapor pressure of the liquid_________, the __surface area of the liquid_________, and __temperature_________. 6 In a dilute acid solution, as the pH value increases, the acidity of the solution _A_______. A. Increase B. Decrease C. Not necessarily D. Remain unchanged For filter-type gas masks, ammonia gas requires __A______. A. Yellow B. Brown C. Black D. Green 8 In the reaction in which hydrogen and oxygen combine to form water, 8 g of hydrogen reacts completely with oxygen; the mass of oxygen is __D______. A. 38g B. 32g C. 48g D. 64g When compressed air is interrupted, a diaphragm control valve of the air-operated type should __C______. A. Shut down immediately B. Remain in place C. Turn on immediately D. Stop adjusting. The suction height of pump 10 has a limit, and it is related to the local atmospheric pressure and the __B______ of the liquid. A. Mass B. Density C. Volume D. Flow rate
1 Reasons for fluid resistance: _fluid viscosity_____ and _fluid velocity______, __boundary friction_____________. 2 Under normal circumstances, when the concentration of nitrogen oxides exceeds ___5ppm________, it can cause chest pain; when the concentration reaches ___100ppm_________, it can lead to pulmonary edema and even death from acute poisoning. 3 A three-phase power supply has its alternating current frequency altered through a __inverter_________, thereby changing the speed of the motor; this is known as ___variable-frequency speed control______________. 4 The oil level in the vacuum pump’s crankcase should be maintained at 2/3 of the capacity, and the dripping rate of oil from the cylinder oil cups should be __20______________ drops per minute. 5 The evaporation rate is related to the __saturation vapor pressure of the liquid_________, the __surface area of the liquid_________, and __temperature_________. 6 In a dilute acid solution, as the pH value increases, the acidity of the solution _b_______. A. Increase B. Decrease C. Not necessarily D. Remain unchanged For filter-type gas masks, ammonia gas requires __A______. A. Yellow B. Brown C. Black D. Green 8 In the reaction in which hydrogen and oxygen combine to form water, 8 g of hydrogen reacts completely with oxygen; the mass of oxygen is __D______. A. 38g B. 32g C. 48g D. 64g When compressed air is interrupted, a diaphragm control valve of the air-operated type should __C______. A. Shut down immediately B. Remain in place C. Turn on immediately D. Stop adjusting. The suction height of pump 10 has a limit, and it is related to the local atmospheric pressure and the __B______ of the liquid. A. Mass B. Density C. Volume D. Flow rate
1: Fluid viscosity, flow rate, pipe wall roughness 2: 50mg/m3, 400-600mg/m3 3: Inverter, variable-frequency speed control motor 4: 2/3, 10-20 5: Temperature, pressure, evaporation area 6: B 7: A 8: D 9: A 10: B
1: Fluid viscosity, flow rate, tube wall roughness 2: 50mg/m3, 400-600mg/m3 3: Inverter, variable-frequency speed control motor 4: 2/3, 10-20 5: Temperature, pressure, evaporation area 6: C 7: A 8: D 9: A 10: B
1. Viscosity, friction, turbulence； 2, 53.4 mg/m³, 411 mg/m³ ； 3. Inverter, variable frequency speed control ； 4, 5: Temperature, saturated vapor pressure, surface area ； 6、B ； 7, 8, D ； 9、A ； 10、B
1. Fluid viscosity, flow velocity, and pipe wall roughness. 2. Five parts per million, 50 mg/m3. 3. Inverter, variable frequency speed control. 4, 2/3, 10-20. 5. Evaporation area, evaporation temperature, system pressure. 6, C 7, A 8, D 9, A 10, B
1 Reasons for fluid resistance: _fluid viscosity_____ and _fluid velocity______, __boundary friction_____________. 2 Under normal circumstances, when the concentration of nitrogen oxides exceeds ___5ppm________, it can cause chest pain; when the concentration reaches ___100ppm_________, it can lead to pulmonary edema and even death from acute poisoning. 3 A three-phase power supply has its alternating current frequency altered through a __inverter_________, thereby changing the speed of the motor; this is known as ___variable-frequency speed control______________. 4 The oil level in the vacuum pump’s crankcase should be maintained at the __specified_______ level, and the dripping rate of the oil in the cylinder cups should be __30______________ drops per minute. 5 The evaporation rate is related to the __saturated vapor pressure of the liquid, the __surface area of the liquid_________, and __temperature_________. 6 In a dilute acid solution, as the pH value increases, the acidity of the solution _A_______. A. Increase B. Decrease C. Not necessarily D. Remain unchanged For filter-type gas masks, ammonia gas requires __A______. A. Yellow B. Brown C. Black D. Green 8 In the reaction in which hydrogen and oxygen combine to form water, 8 g of hydrogen reacts completely with oxygen; the mass of oxygen is __D______. A. 38g B. 32g C. 48g D. 64g When compressed air is interrupted, a diaphragm control valve of the air-operated type should __C______. A. Shut down immediately B. Remain in place C. Turn on immediately D. Stop adjusting. The suction height of pump 10 has a limit, and it is related to the local atmospheric pressure and the __B______ of the liquid. A. Mass B. Density C. Volume D. Flow rate
1 Reasons for fluid resistance: fluid viscosity _____ and ___ flow velocity____, ________ tube wall roughness _______. 2 Under normal circumstances, when the concentration of nitrogen oxides exceeds ____50ppm_______, it can cause chest pain; when the concentration reaches ________400ppm____, it can lead to pulmonary edema and even death from acute poisoning. 3 A three-phase power supply has its AC frequency altered through a ____inverter_______, thereby changing the speed of the motor; this is known as _______variable frequency speed control__________. 4 The oil level in the vacuum pump’s crankcase should be maintained at ___2/3______ of the maximum level, and the dripping rate of oil from the cylinder oil cups should be ________10________ drops per minute. 5 The evaporation rate is related to _____temperature____, _______pressure____, and _____surface area____. 6 In a dilute acid solution, as the pH value increases, the acidity of the solution _____B___. A. Increase B. Decrease C. Not necessarily D. Remain unchanged For filter-type gas masks, ammonia gas requires ____A____. A. Yellow B. Brown C. Black D. Green 8 In the reaction in which hydrogen and oxygen combine to form water, 8 g of hydrogen reacts completely with oxygen; the mass of oxygen is ____D____. A. 38g B. 32g C. 48g D. 64g When compressed air is interrupted, a diaphragm control valve should _____A___. A. Shut down immediately B. Remain in place C. Turn on immediately D. Stop adjusting. The suction height of pump 10 has a limit, and it is related to the local atmospheric pressure and the ___B_____ of the liquid. A. Mass B. Density C. Volume D. Flow rate
1 The causes of fluid resistance are ___internal friction caused by viscosity___ and _____local resistance__，_____________. 5 The evaporation rate is related to the ____heat load_______, ____T_______, and ______P_____. 6 In a dilute acid solution, as the pH value increases, the acidity of the solution ___B_____ . A. Increase B. Decrease C. Not necessarily D. Remain unchanged 7 For filter-type gas masks, ammonia gas should be handled using __B______. A. Yellow B. Brown C. Black D. Green 8 In the reaction in which hydrogen and oxygen combine to form water, 8 g of hydrogen reacts completely with oxygen; the mass of oxygen is ___D______. A. 38g B. 32g C. 48g D. 64g When compressed air supply is interrupted, a 9-port diaphragm control valve should ___C______. A. Shut down immediately B. Remain in place C. Turn on immediately D. Stop adjusting. The suction height of pump 10 has a limit, and it is related to the local atmospheric pressure and the ___B_____ of the liquid. A. Mass B. Density C. Volume D. Flow rate
Give it a try, hehe. 1. Fluid viscosity, flow rate, and pipe wall roughness. 2. Five parts per million, 50 mg/m3. 3. Inverter, variable frequency speed control. 4, 2/3, 10-20. 5. Evaporation area, evaporation temperature, system pressure. 6, C 7, A 8, D 9, A 10, B
1. Internal friction force of fluids； Flow conditions of the fluid ； The roughness of the pipe wall, as well as the length and diameter of the pipe; 2, five parts per million ； One millionth one hundred 3. Inverter ； Variable frequency speed control 4, 2/3 ； 10-20 5. Temperature, surface area of the liquid, air flow over the liquid surface 6. B 7. It seems to should be gray 8. D 9. A 10. B
Viscosity, flow boundary conditions, flow patterns: 0.15mg/m³, 0.30mg/m³; frequency converter, variable frequency speed control: 2/3, 20; temperature, pressure, evaporation area: C A D A B
1: Fluid viscosity, flow rate, pipe wall roughness 2: 50mg/m3, 400-600mg/m3 3: Inverter, variable-frequency speed control motor 4: 2/3, 10-20 5: Temperature, pressure, evaporation area 6: B 7: A 8: D 9: A 10: B
1 Causes of fluid resistance: _viscosity_, _flow velocity_, and _tube wall roughness_. 2 Under normal circumstances, when the concentration of nitrogen oxides exceeds ___, it can cause chest pain; when the concentration reaches _____, it can lead to pulmonary edema and even death from acute poisoning. 3 A three-phase power supply has its AC frequency altered through an _inverter_, thereby changing the speed of the motor; this is known as _variable-frequency speed control_. 4 The oil level in the vacuum pump’s crankcase should be maintained at _2/3_ of the capacity, and the dripping rate of oil from the cylinder oil cups should be _10-20_ drops per minute. 5 The evaporation rate is related to the _heating surface area_, _temperature_, and _pressure_. 6 In a dilute acid solution, as the pH value increases, the acidity of the solution ___B__. A. Increase B. Decrease C. Not necessarily D. Remain unchanged 7 For filter-type gas masks, ammonia gas requires _A__. A. Yellow B. Brown C. Black D. Green 8 In the reaction in which hydrogen and oxygen combine to form water, 8 g of hydrogen reacts completely with oxygen; the mass of oxygen is _D_. A. 38g B. 32g C. 48g D. 64g When compressed air is interrupted, a 9-port diaphragm control valve should ___A___. A. Shut down immediately B. Remain in place C. Turn on immediately D. Stop adjusting. The suction height of pump 10 has a limit, and it is related to the local atmospheric pressure and the __B__ of the liquid. A. Mass B. Density C. Volume D. Flow rate
1 Reasons for fluid resistance: fluid viscosity _____ and ___ boundary conditions of flow____, ______ flow pattern _______. 2 Under normal circumstances, when the concentration of nitrogen oxides exceeds ____53.4 mg/m3____, it can cause chest pain; when the concentration reaches ______411–617 mg/m3____, it can lead to pulmonary edema and even death from acute poisoning. 3 A three-phase power supply has its AC frequency altered through a ____inverter_______, thereby changing the speed of the motor; this is known as _______variable frequency speed control__________. 4 The oil level in the vacuum pump’s crankcase should be maintained at ___2/3_____ of the capacity, while the dripping rate of oil from the cylinder oil cups should be _______10-20________ drops per minute. 5 The evaporation rate is related to _____temperature____, _______pressure____, and _____evaporation area____. 6 In a dilute acid solution, as the pH value increases, the acidity of the solution _____B___. A. Increase B. Decrease C. Not necessarily D. Remain unchanged. 7 For filter-type gas masks, ammonia gas should be handled using ____A____. A. Yellow B. Brown C. Black D. Green 8 In the reaction in which hydrogen and oxygen combine to form water, 8 g of hydrogen reacts completely with oxygen; the mass of oxygen is ____D____. A. 38g B. 32g C. 48g D. 64g 9 When compressed air supply is interrupted, a diaphragm-type control valve should _____ A ___. A. Shut down immediately B. Remain in place C. Turn on immediately D. Stop adjusting. The suction height of pump 10 has a limit, and it is related to the local atmospheric pressure and the ___B_____ of the liquid. A. Mass B. Density C. Volume D. Flow rate
1 Fluid viscosity, flow rate, pipe wall roughness 250mg/m3, 400-600mg/m3 3 Inverter, variable-frequency speed control motor 42/3, 10-20 5 Temperature, pressure, evaporation area 6B 7A 8D 9A 10B