Does someone study the settling of dust?

1 Answer

Answer :

answer:I would guess that there are people who study how dust accumulates and falls, especially in the forensic sciences, with regards to crime and body decomposition. They would need to know how fast or at what rate it falls, accumulates or changes in depth. Of course geologists would also sort of study dust, with regards to the earth and stones and layers. And then there are pedologists who study soil in its natural setting.

Related questions

Description : How do you keep your popcorn ceilings free of dust?

Last Answer : Scraping is not as bad as you think. Just cover everything in plastic and go to it. It’s so worth it in the long run.

Description : What is Diamond Dust?

Last Answer : Diamond dust is a light dust or cloud that is formed just above the ground. This cloud contains ice crystals. It is sometimes also referred to as Clear Sky Precipitation because diamond dust is ... always possible for the weather department to detect ice crystals, but an observer can see it easily.

Description : How to Remove Dust ?

Last Answer : How to Remove Dust Like death and taxes, dust is a part of life that we can't avoid. From cameras, mattresses and furniture, dust will always find a way to get in and stay unless removed. ... cleaning to be a little easier, these two things may be the first things you need to consider avoiding.

Description : How to Dust a Computer ?

Last Answer : How to Dust a Computer Dust is one of the leading causes of static problems with your computer parts. You may think that your computer is clean, but you never know how much dust and grime has built up ... but look good as well. With these tips, you can dust your computer safely and keep it clean.

Description : Explain ash disposal and dust collection in a thermal power plant.

Last Answer : Ash disposal:-  Various methods of disposal of ash are:  Mechanical handling system.  Pneumatic system. Hydraulic system  Steam jet system  Commonly used ash handling ... be done either manually or automatically.  This removed fly ash is collected in separate container

Description : What is bellybutton lint?

Last Answer : Lint that collects in the bellybutton. There’s nothing special about it. Edit: Okay, to be more specific, it’s a combination of clothing fibers, dust, and dead skin cells.

Description : The most efficient equipment for the removal of sub-micronic dust particles from blast furnace gas is the (A) Venturi atomiser (B) Gravity settling chamber (C) Electro-static precipitator (D) Cyclone separator

Last Answer : (C) Electro-static precipitator

Description : Particle size range in which dust catcher (gravity settling chamber) works most effectively and efficiently is __________ microns. (A) < 5 (B) 10 to 25 (C) < 74 (D) > 1000

Last Answer : (C) < 74

Description : Most efficient and suitable dust removal equipment for removal of fly￾ash from flue gas in a thermal power plant is the (A) Gravity settling chamber (B) Cyclone separator (C) Electrostatic precipitator (D) Bag filter

Last Answer : (C) Electrostatic precipitator

Description : Which is the most efficient dust removal equipment for removal of submicronic dust particles from blast furnace gas? (A) Packed scrubber (B) Gravity settling chamber (C) Electrostatic precipitator (D) Hydrocyclone

Last Answer : (C) Electrostatic precipitator

Description : Which of the following does not discharge the dust collected as a dry solid? (A) Electrostatic precipitator (B) Wet scrubber (C) Bag filter (D) Gravity settling chamber

Last Answer : (B) Wet scrubber

Description : 1. What is Study of growth and development of embryo? 2. What is the minimum permissible age for employment in any factory or mine? 3. Angular separation between two colours of the spectrum depends ... exporting iron ore to Japan? 20. Which site, where Ashokan pillars exist, has the bull capital?

Last Answer : Answer : 1. Embryology 2. 14 years 3. Angle of deviation 4. Aravallis 5. Neolithic Age 6. Vienna 7. Arundhati Roy 8. Sphygmology 9. The Great Himalayan Range 10. Second and seventh 11. ... First 14. Rajasthan 15. Mahavira 16. Thomas Paine 17. Soyabean 18. President 19. Paradeep 20. Rampurva

Description : Cryogenics is: (1) A scientific study of dust (2) Study of heat (3) Scientific study of very low temperatures (4) Study of genesis

Last Answer : Scientific study of very low temperatures

Description : How do you keep your glues, epoxies, and paints from settling or going bad?

Last Answer : I do have this issue. The best you can do is try to keep those things in a climate controlled environment. Once they settle out like that I no longer trust them for projects. I generally just buy as ... set a reminder to stir them all up when you change the clock for DST. That may help a little.

Description : Do you ask enough questions, or are you happily settling for what you know already?

Last Answer : I used to ask a lot, until I just ran out of things to ask. I ask when I need to. Don’t worry about asking too much because it means you just have a curious mind :)

Description : Am I just settling (career-related)?

Last Answer : Are you equating legal assistant with paralegal?

Description : What are the pros and cons of settling down v. being a single bachelor for the rest of ones life?

Last Answer : answer:We married men live longer than our single brothers. We have the opportunity and challenge of making the world better through the children we help to raise. We can truly love our partners ... we must be obeyed. We must learn that listening is so much more important than offering solutions.

Description : How do you know when you're settling (relationships)?

Last Answer : that sick feeling in my tummy that i’m settling

Description : In which nomad man started settling? -General Knowledge

Last Answer : The answer is 'Neolithic Age'

Description : In which nomad man started settling? -General Knowledge

Last Answer : answer:

Description : In which nomad man started settling? -General Knowledge

Last Answer : answer:

Description : We arrived at the cottage yesterday and bees or hornets are flying from the top. How to proceed in such a case? We are afraid to enter the cottage.

Last Answer : That's a pretty big difference. If they were bees, which is unlikely, it would be best to call a beekeeper to dump the honeycomb with the queen and the remaining bees will fly away on their own. Wasps usually ... flight. I have never seen you in the house, I have no idea how to deal with them ...

Description : Gravity settling tanks/porous filters are used to remove particles larger than

Last Answer : Gravity settling tanks/porous filters are used to remove particles larger than A. `2 mum ` B. `50 mum` C. `20 mum` D. `10 mum`

Description : What is settling rhymes and why it is important?

Last Answer : Settling rhymes are poems with "action words". They areimportant, especially in youngsters, because they allow theyoungster to build word skills.

Description : What advantages would there have been to settling along the Indus River near its mouth at the Arabian sea?

Last Answer : Feel Free to Answer

Description : What is the settling of sediments at the bottom of a lake called?

Last Answer : Generically it is called "sedimentation", in lake the sedimentscan be called "varves".

Description : Is settling a noun?

Last Answer : Yes, word 'settle' is an noun as a word for a long wooden bench, often with a compartment under the seat; a word for a thing.The word 'settle' is also a verb: settle, settles, settling, settled.

Description : Is settling a noun?

Last Answer : Yes, word 'settle' is an noun as a word for a long wooden bench, often with a compartment under the seat; a word for a thing.The word 'settle' is also a verb: settle, settles, settling, settled.

Description : Iron and manganese present as pollutants in water cannot be re-moved by - (1) oxidation followed by settling and filtration (2) chlorination (3) ion exchange process (4) lime soda process or manganese zeolite process

Last Answer : (2) chlorination Explanation: Water chlorination is the process of adding chlorine or hypochlorite to water. This method is used to kill certain bacteria and other microbes in tap water as chlorine is ... is used to prevent the spread of waterborne diseases such as cholera, dysentery, typhoid etc.

Description : The term reactor referred to in waste water treatment is – (1) Vessel (2) Settling tank (3) Clarifier (4) Aeration tank

Last Answer : (4) Aeration tank Explanation: Reactors are industrial processing tanks for the treatment of wastewater. The tanks have a "flow through" system, with raw wastewater (influent) coming in at one end and ... out the other. While one tank is in settle/ decant mode the other is aerating and filling.

Description : The dimensions of a rectangular settling tank are: length 24 m, width 6 m and depth 3 m. If 2 hour detention period for tanks is recommended, the rate of flow of sewage per hour, is A. 204 cu.m B. 208 cu.m C. 212 cu.m D. 216 cu.m

Last Answer : ANS: D

Description : The detention time (t) of a settling tank, may be defined as the time required for A. A particle to travel along its length B. A particle to travel from top surface to bottom sludge zone C. The flow of sewage to fill the tank D. None of these

Last Answer : ANS: C

Description : The width of a settling tank with 2 hour detention period for treating sewage 378 cu m per hour, is A. 5 m B. 5.5 m C. 6.5 m D. 7 m

Last Answer : ANS: D

Description : The settling velocity of a spherical particle of diameter less than 0.1 mm as per Stock’s law, is A. Vs = 418 (Gs – Gw) d [(3T + 70)/100] B. Vs = 418 (Gs – Gw)d² [(3T + 70)/100] C. Vs = 218 (Gs – Gw)d² [(3T + 70)/100] D. Vs = 218 (Gs – Gw)d [(3T + 70)/100]

Last Answer : ANS: B

Description : In a sedimentation tank (length L, width B, depth D) the settling velocity of a particle for a discharge Q, is A. Q/(B × D) B. Q/(L × D) C. Q/L D. Q/(B × L)

Last Answer : ANS: D

Description : To prevent settling down of sewage both at the bottom and on the sides of a large sewer, self-cleaning velocity recommended for Indian conditions, is A. 0.50 m/sec B. 0.60 m/sec C. 0.70 m/sec D. 0.75 m/sec

Last Answer : ANS: D

Description : The settling velocity of the particles larger than 0.06 mm in a settling tank of depth 2.4 is 0.33 m per sec. The detention period recommended for the tank, is A. 30 minutes B. 1 hour C. 1 hour and 30 minutes D. 2 hours

Last Answer : ANS: D

Description : Gravity settling process is not involved in the working of a (A) Hydrocyclone (B) Classifier (C) Dorr-thickener (D) Sedimentation tank

Last Answer : (A) Hydrocyclone

Description : Two particles are called to be equal settling, if they are having the same. (A) Size (B) Specific gravity (C) Terminal velocities in the same fluid & in the same field of force (D) None of these

Last Answer : (C) Terminal velocities in the same fluid & in the same field of force

Description : A 30% (by volume) suspension of spherical sand particles in a viscous oil has a hindered settling velocity of 4.44 μm/s. If the Richardson Zaki hindered settling index is 4.5, then the terminal velocity of a sand grain is (A) 0.90 μm/s (B) 1 μm/s (C) 22.1 μm/s (D) 0.02 μm/s

Last Answer : (B) 1 μm/s

Description : A suspension of glass beads in ethylene glycol has a hindered settling velocity of 1.7 mm/s, while the terminal settling velocity of a single glass bead in ethylene glycol is 17 mm/s. If the Richardson-Zaki hindered settling index ... in the suspension is (A) 0.1 (B) 0.4 (C) 0.6 (D) None of these

Last Answer : (C) 0.6

Description : Sorting classifiers employing differential settling methods forseparation of particles make use of the differences in their (A) Particle sizes (B) Densities (C) Terminal velocities (D) None of these

Last Answer : (C) Terminal velocities

Description : In classification, particles are said to be equal settling, if they have the same terminal velocities in the (A) Different fluids (B) Same fluid (C) Same field of force (D) Both (B) and (C)

Last Answer : (D) Both (B) and (C)

Description :  A coalescer in a mixer-settler liquid-liquid extraction column (A) Comprises of thin bed of substances of extended surface having high porosity (B) Helps in increasing the bubble size entering the settler ... increasing the settling rate of the bubbles (D) All 'a', 'b', & 'c'

Last Answer : (D) All 'a', 'b', & 'c'

Description : In which nomad man started settling?

Last Answer : Neolithic Age

Description : Leaching of coarse solid lumps is also termed as (A) Decoction (B) Dissolution (C) Percolation (D) Agitation and settling

Last Answer : (C) Percolation

Description : What is settling time?

Last Answer : It represents the time it takes for the output to settle within a specified band ½LSB of its final value following a code change at the input (usually a full scale change). It depends ... capacitance & inductances. Settling time ranges from 100ns. 10Ws depending on word length & type circuit used.

Description : For motion of spherical particles in a stationary fluid, the drag co￾efficient in hindered settling compared to that in free settling is (A) More (B) Less (C) Equal (D) More or less, depending on the type of particle

Last Answer : (A) More

Description : Drag co-efficient in hindered settling is __________ that in free settling. (A) Less than (B) Equal to (C) Not necessarily greater than (D) Always greater than

Last Answer : (D) Always greater than

Description : For the free settling of a spherical particle through a fluid, the slope of, CD-log NRe , plot is (A) 1 (B) -1 (C) 0.5 (D) -0.5

Last Answer : (B) -1