MCQ's On Water Supply Engineering - Set 16 - ObjectiveBooks

MCQ's On Water Supply Engineering - Set 16

Practice Test: Question Set - 16

1. At break point of chlorination,
    (A) Chlorine is used to oxidize
    (B) Residual chloride is zero
    (C) Residual chloride is maximum
    (D) Residual chlorine reappears

2. If pH value of water is
    (A) 7 water it is said to be neutral
    (B) Less than 7 it is said to be acidic
    (C) More than 7 it is said to be alkaline
    (D) All the above

3. Dissolved carbon dioxide, can be removed from the supply main by
    (A) Sedimentation
    (B) Aeration
    (C) Chlorination
    (D) Coagulation

4. Grade aqueducts are not allowed to run
    (A) Full
    (B) ¾th full
    (C) ½ full
    (D) ¼th full

5. According to IS : 1172-1963, a minimum of 135 liters of water capita per day, is required for
    (A) Boarding schools
    (B) Nurses home and medical quarters
    (C) Hostels
    (D) All the above

6. The temporary hardness of water can be removed by
    (A) Boiling
    (B) Adding lime
    (C) Adding alum
    (D) Filtration

7. The level of underground water is called
    (A) Water level
    (B) Water table
    (C) Negative level
    (D) Invert level

8. The period of cleaning of a slow sand filter, is usually
    (A) 5 to 10 days
    (B) Two weeks to three weeks
    (C) One month to three months
    (D) Three months to six months

9. Specific yield of a well is
    (A) Quantity of water than can be drawn from the well
    (B) Flow of water per unit time
    (C) Total quantity of water available in the well
    (D) Quantity of water per unit time per unit draw-down

10. By adding 1 ml of Orthotolidine solution to 100 ml chlorinated water taken after contact period, the residual chlorine makes the color of solution
    (A) Yellowish
    (B) Greenish
    (C) Bluish
    (D) Reddish

11. Rapid gravity filter can only remove turbidity of water up to
    (A) 15 to 25 gm/liter
    (B) 25 to 30 gm/liter
    (C) 30 to 35 cm/liter
    (D) 35 to 40 gm/liter

12. In pumping stations, the type of joint generally used, is
    (A) Socket and spigot joint
    (B) Flanged joint
    (C) Expansion joint
    (D) Dresser coupling joint

13. Rapid sand filter
    (A) Should be preceded by coagulation and sedimentation
    (B) Uses rapid sand as filter media
    (C) Is used after slow sand filtering has been done
    (D) Can combine disinfection also

14. Pick up the incorrect statement from the following regarding fire hydrants
    (A) Fire hydrants are fitted in water mains at 100 m to 150 m apart at fire
    (B) The minimum water pressure hydrants, is kept 1.5 kg/cm2
    (C) The water at pressure 1 to 1.5 kg/cm2 is made available for 4 to 5 hours for constant use
    (D) None of these

15. Pick up the correct statement from the following:
    (A) At a particular speed of operation, the head produced decreases with the increase of discharge
    (B) At zero discharge, discharge valve remaining closed, the head developed is maximum which is known as shut-off head
    (C) At a particular speed the discharge at which efficiency of a pump is maximum, is known as normal discharge
    (D) All the above

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