Texas Class C Surface Water Exam Review Questions With
Complete Solutions
A chemical commonly used to raise pH is: Correct Answers
Lime (Soda ash)
A chlorinator setting is 35 lbs/day. If the flow being chlorinated
is 1.15 MGD, the chlorine dosage is:
Formula: MGD x 8.34 x mg/L = lbs Correct Answers 3.65
mg/L (rounding)
A chlorine cylinder valve is thought to be leaking. If ammonia
vapor is passed near the valve, the presence of a leak would be
indicated by: Correct Answers White smoke
A chlorine residual in water can be determined by using the
reagent: Correct Answers DPD - diethyl-p-pheylenediamine
A disease that cannot be contracted by drinking contaminated
water is: Correct Answers Malaria
A flow of 1.55 ft^3 per second is ___ gpm Correct Answers 696
gpm
A grab sample represents the quality of the water when? Correct
Answers Only when the sample was taken
A hypochlorinator is used to feed ___ into a water supply
Correct Answers Hypochlorite solution
,A major cause of pump and motor shaft coupling wear is a:
Correct Answers Misalignment between pumps and motor
flanges
A non-permit confined space by OSHA standards means a
confined space that: Correct Answers Does not contain or have
the potential to contain any hazard capable of causing death
A pH reading of 6.0 in raw water indicates the sample is what?
Correct Answers Acidic
A pH value of 7.0 is considered to be what? Correct Answers
Neutral
A pneumatic ejector lifts water from low points to higher levels.
The device used to achieve this is a(n)? Correct Answers Air
compressor
A pump may be damaged if it is started with the discharge valve
closed, and the pump is a(n): Correct Answers Positive
displacement pump
A sand filter will not remove: Correct Answers Dissolved
oxygen
A standpipe: Correct Answers Has a diameter less than it's
height
A valve that joins a customer's service to the water main is
called the ____ Correct Answers Corporation cock
, A water storage tank must be disinfected with a dosage of 50
mg/L. The tank is 36 feet in diameter and 20 feet high. The
amount of 65% calcium hypochlorite needed is:
Formula: MGD x 8.34 x mg/L = lbs Correct Answers 97 lbs.
(rounding)
A water treatment plant receives an average flow of 261 gallons
per minute. What is the daily flow of the plant? Correct Answers
0.38 MGD (rounded)
According to the average annual water budget for Texas, the
majority of surface water leaves the state by: Correct Answers
Evaporation and transpiration
According to the TCEQ, a public water system is defined as any
water system that provides piped water for human consumption
to at least _(a)_ service connections on a year-round basis or
regularly serves _(b)_ individuals daily at least_(c)_ days out of
the year. Correct Answers (a) 15; (b) 25; (c) 60
After installation or repair of a water line, it should be treated
with: Correct Answers 50 mg/L of chlorine for 24 hours
Alkalinity is a direct measure of water's capability to resists
changes in: Correct Answers pH (acidity)
An altitude valve is used to: Correct Answers Control the water
elevation in an elevated storage tank
Complete Solutions
A chemical commonly used to raise pH is: Correct Answers
Lime (Soda ash)
A chlorinator setting is 35 lbs/day. If the flow being chlorinated
is 1.15 MGD, the chlorine dosage is:
Formula: MGD x 8.34 x mg/L = lbs Correct Answers 3.65
mg/L (rounding)
A chlorine cylinder valve is thought to be leaking. If ammonia
vapor is passed near the valve, the presence of a leak would be
indicated by: Correct Answers White smoke
A chlorine residual in water can be determined by using the
reagent: Correct Answers DPD - diethyl-p-pheylenediamine
A disease that cannot be contracted by drinking contaminated
water is: Correct Answers Malaria
A flow of 1.55 ft^3 per second is ___ gpm Correct Answers 696
gpm
A grab sample represents the quality of the water when? Correct
Answers Only when the sample was taken
A hypochlorinator is used to feed ___ into a water supply
Correct Answers Hypochlorite solution
,A major cause of pump and motor shaft coupling wear is a:
Correct Answers Misalignment between pumps and motor
flanges
A non-permit confined space by OSHA standards means a
confined space that: Correct Answers Does not contain or have
the potential to contain any hazard capable of causing death
A pH reading of 6.0 in raw water indicates the sample is what?
Correct Answers Acidic
A pH value of 7.0 is considered to be what? Correct Answers
Neutral
A pneumatic ejector lifts water from low points to higher levels.
The device used to achieve this is a(n)? Correct Answers Air
compressor
A pump may be damaged if it is started with the discharge valve
closed, and the pump is a(n): Correct Answers Positive
displacement pump
A sand filter will not remove: Correct Answers Dissolved
oxygen
A standpipe: Correct Answers Has a diameter less than it's
height
A valve that joins a customer's service to the water main is
called the ____ Correct Answers Corporation cock
, A water storage tank must be disinfected with a dosage of 50
mg/L. The tank is 36 feet in diameter and 20 feet high. The
amount of 65% calcium hypochlorite needed is:
Formula: MGD x 8.34 x mg/L = lbs Correct Answers 97 lbs.
(rounding)
A water treatment plant receives an average flow of 261 gallons
per minute. What is the daily flow of the plant? Correct Answers
0.38 MGD (rounded)
According to the average annual water budget for Texas, the
majority of surface water leaves the state by: Correct Answers
Evaporation and transpiration
According to the TCEQ, a public water system is defined as any
water system that provides piped water for human consumption
to at least _(a)_ service connections on a year-round basis or
regularly serves _(b)_ individuals daily at least_(c)_ days out of
the year. Correct Answers (a) 15; (b) 25; (c) 60
After installation or repair of a water line, it should be treated
with: Correct Answers 50 mg/L of chlorine for 24 hours
Alkalinity is a direct measure of water's capability to resists
changes in: Correct Answers pH (acidity)
An altitude valve is used to: Correct Answers Control the water
elevation in an elevated storage tank
