Water Supply Engineering MCQ pdf - Set 10 - ObjectiveBooks

# Practice Test: Question Set - 10

1. Normal values of overflow rate for plain sedimentation tanks in litres/hr/m2, generally range between
(A) 100 to 250
(B) 250 to 500
(C) 500 to 750
(D) 750 to 1000

2. P.V.C. pipes can withstand pressure bead of water upto
(A) 25 m
(B) 50 m
(C) 75 m
(D) 100 m

3. Most commonly used pump for lifting water in water supply mains, is
(A) Axial flow pump
(B) Reciprocating pump
(C) Rotary type pump
(D) Centrifugal pumps

4. The fire demand for a city of 50,000 populations, according to Godrich formula, is
(A) 40 mld
(B) 42 mld
(C) 44 mld
(D) 48 mld

5. Pick up the correct statement from the following:
(A) Due to boiling, the bacterias present in water can be destroyed
(B) Lime may be used for softening hard water
(C) Excess lime when added to water, raises the pH value of water
(D) All the above

6. If V is total consumption of water in liters for a population of N individuals, per capita consumption or water allowance for the water supply Q, is given by
(A) Q = V/12N
(B) Q = V/24N
(C) Q = V/265N
(D) None of these

7. According to Buston's formula, fire demand in litres per minute for a population of P thousands, is
(A) 3182 √P
(B) 1136.5 [(P/10) + 10]
(C) 4637 √P (1 - 0.01 P)
(D) 5663 √P

8. For controlling algae, the most commonly used chemical, is
(A) Copper sulphate
(B) Alum
(C) Lime
(D) Bleaching powder

9. For centrifugal pumps
(A) Initial cost is low
(B) Limited space is required
(C) The discharge obtained is steady and non-pulsating
(D) All the above

10. The storage capacity of a reservoir may be divided into three zones. The lowest zone is
(B) Useful storage
(C) Surcharge storage
(D) None of these

11. Economic height of a dam is the height corresponding to which
(A) Cost of the dam per unit of storage is minimum
(B) Amount of silting is less
(C) Cost of dam per unit storage is maximum
(D) Free board provided is least

12. For maximum alkalinity of water, pH value should be
(A) Zero
(B) Less than 7
(C) More than 7
(D) 14

13. The efficiency of a pumping set, is generally assumed
(A) 50 %
(B) 55 %
(C) 60 %
(D) 65 %

14. The population growth curve is
(A) S-shaped curve
(B) Parabolic curve
(C) Circular curve
(D) Straight line

15. The fire demand for ascertaining the empirical formula 1136.5 [(P/10) + 10] known as
(A) Kuichling's formula
(B) Buston's formula
(C) Freeman formula
(D) Under Writers formula

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