CORRECT ACTUAL QUESTIONS AND
CORRECTLY WELL DEFINED ANSWERS
LATEST ALREADY GRADED A+
According to the safe water drinking act, the basic definition
of public water supply system is any water system that
supplies water for human consumption that serves: -
ANSWERS-15 service connections or over 25 persons for
over 60 days a year
Normally calcium and magnesium ions are expressed as
________ when dealing with softening. - ANSWERS-CaCo3
The water in the I-95 elevated tank has a temperature of 15
degrees Celsius, the PH is 8.7, pressure gauge is reading
52psi, cl2 residual is 3.8mg/l how many feet is the water
tank?
52ft
15ft
,38ft
120ft - ANSWERS-120ft = (2.31x52)
What is the logarithm of the reciprocal the the hydrogen ion
activity?
Acidic solution
Ph
standard solution
molar solution - ANSWERS-Ph
What is the detention time in minutes for a basin that is
15th in diameter and 12ft deep and treats a flow of .532
mgd?
48 min.
487 min
42.9 min
27.53 min - ANSWERS-42.9 D = volume / flow
Name two reserve flow conditions that cause back-flow in a
distribution system.
, water hammer and air gap
vacuum breaker and back sihponage
back-pressure and backflow
back-pressure and back siphonage - ANSWERS-back-
pressure and back siphonage
Units that combine coagulation, Flocc, & sedimentation into
a single basin are: - ANSWERS-Solid contact units
Valves that operate 90 degrees open to shut are: -
ANSWERS-Eccentric and butterfly
Which of the following methods is best for determining the
depth of water in a clearwell: - ANSWERS-bubbler
Chlorine expands approximately how many times from
liquid to gas? - ANSWERS-450
The nephlometric method of measuring turbidity is based
on:
scattering of light