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Explain Hardness - Water Softening
1) Hardness is used to characterize a water that does not lather well, causes a scum in the bath tub and leaves hard, white, crusty deposits when water is heated
2) Calcium or magnesium forms soap- Ca or Mg complex and prevents soap from interacting with dirt
3) Hardness- caused mainly by Calcium and Magnesium(actually all polyvalent ions)
4) Common units are meq/l or mg/l as CaCO3
The Morison equation vs. diffraction analysis in determining wave force on piles The choice between Morison's equation and diffraction analysis in determining the wave forces o
Example for Productivity Analysis and Improvement An excavator with a bucket capacity of 3-yd 3 has a standard production rate of 2,160-yd 3 for an 8-hour day. The job site
Q. What is Unimat Machine? The machine has got 16 independently tiltable tamping tools which enable the machine to work on points and crossing as well as on plain track. The ma
A saturated clay layer 4 m thick is located 6 m below GL. The void ratio of the clay is 1.0. When a raft foundation is located at 2 m below GL, the stresses at the top and bottom o
why base isolation is not good for tall building
Explain the Precedence Relationships a. Finish-to-Start - the most common, the predecessor activity must finish before the successor activity can start b. Finish to Finish
Q. Bitumen emulsions - difference between anionic emulsions and cationic emulsions? Bitumen emulsions comprises particles of bitumen dispersed in water by using emulsifying age
size of sieve to analysis the grading of 10 mm size stone grit
Define Surface Communication - Underwater Inspection of Bridge? It is not necessary to have voice communication in all situations, particularly for shallow dives where the dive
Ask quA contractor has both a 3-cy and a 5-cy shovel in the equipment fleet. Select the minimum size shovel that will excavate 450,000 bcy of common earth in a minimum of 120 worki
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