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Environmental Engineering - Interview Questions and Answers

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101. As compared to higher pH values, the contact period required for efficient chlorination at lower pH values is
A. smaller
B. larger
C. same
D. none of the above
Explanation:
102. The rate of Alteration of pressure filters is
A. less than that of slow sand filters
B. in between the filtration rate of slow sand filters and rapid sand filters
C. greater than that of rapid sand filters
D. equal to that of slow sand filters
Explanation:
103. As compared to cast iron pipes, steel pipes are
A. heavier
B. stronger
C. costlier
D. less susceptible to corrosion
Explanation:
104. Period of cleaning of slow sand filters is about
A. 24 - 48 hours
B. 10-12 days
C. 2-3 months
D. 1-2 year
Explanation:
105. Cleaning is done by i) scraping and removal in filters slow sand ii) back washing in slow sand filters iii) scraping and removal in filters rapid sand iv) back washing in rapid sand filters The correct answer is
A. (i) and (ii)
B. (ii) and (iii)
C. (i) and (iv)
D. (ii) and (iv)
Explanation:
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