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Total Questions : 824 | Page 5 of 83 pages
Question 41. The yield of a rapid gravity filter as compared to that of slow sand filter, is
  1.    10 times
  2.    15 times
  3.    20 times
  4.    30 times
 Discuss Question
Answer: Option D. -> 30 times
Question 42.


S1 and S2 are the draw downs in an observation well at times t1 and t2 after pumping. For discharge Q and coefficient of transmissibility T, the relationship, is


  1.    ` S_2 - S_1 = (2.3 Q)/(pi t) log _10 `` t_2/t_1`
  2.    ` S_2 - S_1 = (2.3 Q)/(4pi t) log _10 `` t_2/t_1`
  3.    ` S_2 - S_1 = (2.3 Q)/(4pi t) log _10 `` t_2/t_1`
  4.    ` S_2 - S_1 = (2.3 Q)/(4pi t) log _10 `` t_1/t_2`
 Discuss Question
Answer: Option B. -> ` S_2 - S_1 = (2.3 Q)/(4pi t) log _10 `` t_2/t_1`


Question 43.

For the same draw down in two observations wells at distances r1 and r2, the times after start of pumping are t1 and t2 hours respectively. The relation which holds good is


  1.    ` t_2 = r_2/r_1 xx t_1`
  2.    ` t_2 =( r_2/r_1)^2 xx t_1`
  3.    ` t_2 = (r_2/r_1)^3 xx t_1`
  4.    ` t_2 =( r_2/r_1 ) t_1^2`
  5.    none of these.
 Discuss Question
Answer: Option B. -> ` t_2 =( r_2/r_1)^2 xx t_1`


Question 44.


If P is population of a city in thousands and Q is fire demand in litres per minute, for proper estimate of water, the Empirical formula `Q = 1135 ( P/5 + 10)`  If P Is Population Of A City In Thousands And Q Is Fire Dema... is suggested by



  1.    National Board of fire under-writers
  2.    Freeman
  3.    Kuichling
  4.    None of these.
 Discuss Question
Answer: Option B. -> Freeman


Question 45.

Grade aqueducts are not allowed to run


  1.    full
  2.    `3/4` th full
  3.    `1/2` full
  4.    `1/4`th full
 Discuss Question
Answer: Option A. -> full


Question 46.

The formula ` H_L = (n^2 V^2 .L)/(R^(4//3))`  The Formula ` H_L = (n^2 V^2 .L)/(R^(4//3))`  For The ... for the head loss in conduits is generally known as 


  1.    Hazen-William's formula
  2.    Manning's formula
  3.    Darcy-Weisbach formula
  4.    Nikuradse formula.
 Discuss Question
Answer: Option B. -> Manning's formula


Question 47. Pick up the correct statement from the following :
  1.    Excess quantities of iron and manganese in water, cause discolouration of clothes
  2.    Lead and barium salts have toxic effect
  3.    Arsenic and selenium are poisonous to human health
  4.    All the above.
 Discuss Question
Answer: Option D. -> All the above.
Answer: (d).All the above.
Question 48. Pick up the incorrect statement from the following regarding fire hydrants
  1.    Fire hydrants are fitted in water mains at 100 m to 150 m apart at fire
  2.    The minimum water pressure hydrants, is kept 1.5 kg/cm²
  3.    The water at pressure 1 to 1.5 kg/cm² is made available for 4 to 5 hours for constant use
  4.    None of these.
 Discuss Question
Answer: Option D. -> None of these.
Answer: (d).None of these.
Question 49. The specific retention is least in case of
  1.    Clay
  2.    Sand
  3.    Silt
  4.    Coarse gravel.
 Discuss Question
Answer: Option D. -> Coarse gravel.
Answer: (d).Coarse gravel.
Question 50. B.O.D. of treated water should be
  1.    10 ppm
  2.    25 ppm
  3.    20 ppm
  4.    Nil.
 Discuss Question
Answer: Option D. -> Nil.
Answer: (d).Nil.

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