Multiple Choice Questions on Water Supply Engineering - Set 13 - ObjectiveBooks

Practice Test: Question Set - 13

1. Silt storage is the same as
(B) Live storage
(C) Effective storage
(D) None of these

2. According to Kuichling’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

3. The type of pipe commonly used in water supply distribution schemes, is
(A) R.C.C. pipes
(B) Hume pipes
(C) Cast iron pipes
(D) G.I. pipes

4. Pick up the incorrect statement from the following. The source of surface water is from
(A) Streams and rivers
(B) Storage reservoirs
(C) Springs
(D) Ponds and lakes

5. Water supply includes
(A) Collection, transportation and treatment of water
(B) Distribution of water to consumers
(C) Provision of hydrants for fire fighting
(D) All the above

6. The discharge Q = 2Ï€ KHS/2.3 log10 (R/rw) for the confined tube well is obtained from
(A) Thiem's formula
(B) Darcy's formula
(C) Tolman's formula
(D) Dupuits formula

7. m and n are monsoon duration factor and catchment factor respectively. If P is yearly rainfall in cm, runoff can be calculated by
(A) Velocity area method
(B) Weir or spillway method
(C) Use of venturi-meter
(D) Using power plant consumption

8. Acidity in water is caused due to
(A) Mineral acids
(B) Free CO2
(C) Iron sulphate
(D) All the above

9. The cast iron pipes for water supply system are used for
(A) Durability
(B) Strength
(C) Easy connection
(D) All the above

10. In a rapid gravity filter
(A) Raw water from the source is supplied
(B) Disinfected raw water is supplied
(C) Raw water passed through coagulation tank is supplied
(D) None of these

11. The maximum permissible nitrites in public water supplies, is
(A) Nil
(B) 0.5 P.P.M.
(C) 1.0. P.P.M.
(D) 1.5 P.P.M.

12. Most commonly used section in grade aqueducts, is
(A) Circular
(B) Rectangular
(C) Parabolic
(D) Horse shoe section

13. The most important and widely used tube well in India, is
(A) Strainer well
(B) Cavity well
(C) Slotted well
(D) Perforated pipe well

14. The R.L. of ground water table on the sides of a valley is 1505 m whereas R.L. of the stream water is 1475 m. If 60° slope consists of pervious soil between R.L. 1485 m to 1500 m, the gravity spring may be expected at the point of reduced level
(A) 1500 m
(B) 1505 m
(C) 1475 m
(D) 1485 m

15. Critical time for developing a water hammer, is the time required for
(A) Closing the valve
(B) The wave to travel from valve to the reservoir
(C) The wave to travel from the valve to the reservoir and back
(D) None of these

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