Bissoy.com
Doctors Medicines MCQs Q&A

Which of the following is correct in the context of gravel – sand size ratio when the uniformity coefficient is less than 5; consider flow velocity is less than 0.05 ft/sec?

Which of the following is correct in the context of gravel – sand size ratio when the uniformity coefficient is less than 5; consider flow velocity is less than 0.05 ft/sec? Correct Answer D10 gravel = 6 times D10 sand size

When the flow velocity is less than 0.05 ft/sec then in the context of gravel-sand size ratio the correct relation is D10 gravel =6 times D10 sand size. A uniformity coefficient is determined by comparing the 40 percentile with 90 percentile.

Related Questions

Which of the following is correct in the context of gravel – sand size ratio when the uniformity coefficient is greater than 5; consider flow velocity is less than 0.05 ft/sec?
Which of the following statements are correct pertaining to the value of uniformity coefficient Cu for filter sand? (1) For slow sand filters, Cu = 1.8 to 2.5 (2) For rapid sand filters, Cu = 1.3 to 1.7 (3) For slow sand filters, Cu = 1.3 to 1.7 (4) For rapid sand filters, Cu = 1.8 to 2.5
A mixture of 50 kg of cement and gravel contains 10% of gravel. How many kg of gravel must be added to make the gravel content 28% in the new mixture?
A mixture of 50 kg of cement and gravel contains 10% of gravel. How many kg of gravel must be added to make the gravel content 28% in the new mixture?
Consider the following statements in respect of slow sand filter and rapid sand filter: 1. The two filters differ in respect of the standards regarding the non-uniformity of the sand used in their filtering media. 2. The two filters do not differ in respect of the effective size of the sand used in them. 3. The two filters differ in respect of their respective under-drainage system. 4. The two filters differ in respect of their respective rate of filtration. Which of the above statements are correct? 
The ratio of sand to gravel in a mixture is 7 : 8 while that between gravel and cement is 6 : 7. What is the ratio of sand to cement in the mixture?
The ratio of sand to gravel in a mixture is 15: 8 while that between gravel and cement is 10: 12. What is the ratio of sand to cement in the mixture?
The ratio of sand and gravel in a mixture is 12 ∶ 5 while that between gravel and cement is 8 ∶ 16. What is the ratio of sand and cement in the mixture?
The ratio of Sand to gravel in a mixture is 15 : 8 while that between gravel and cement is 6 : 17. What is the ratio of sand to cement in the mixture?
The ratio of sand to gravel in a mixture is 17 : 9 while that between gravel and cement is 6 : 17. What is the ratio of sand to cement in the mixture?