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
- (A) Dead
storage
- (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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