TCEQ Class D Water Operator Exam – Certified
& Approved.
The TCEQ requires distribution pressure to never fall below ______ psi, even
during emergencies. -Answer>>>: 20 psi
Under normal operating conditions, the distribution pressure must be at least
_____ psi. -Answer>>>: 35 psi
The ______ meter is the most common design for residential use. -Answer>>>:
positive displacement
Water mains must be no closer than _______ feet in all directions from sewers
or manholes. -Answer>>>: 9 feet
T/F
Parallel water and sewer lines must be laid in separate ditches. -Answer>>>:
True
The piece of pipe material cut from a main when a tap is made is called a
_______. -Answer>>>: coupon
For laying 6" or larger pipe, trenches must be at least ______ inches wide and
______ inches wider than the pipe diameter. -Answer>>>: 18 inches
12 inches
Water mains must be deep enough to have at least _______ inches of cover. -
Answer>>>: 24 inches
Page 1 of 23
,TCEQ Class D Water Operator Exam – Certified
& Approved.
The valve that connects the service line to the main is called the ________. It
cannot be operated from the ground surface. -Answer>>>: corporation
stop
The valve that connects the service line to the meter is called a ___________. It
can be operated from the meter box. -Answer>>>: curb stop or meter
stop
If shoring is used, it is installed from the ______ and removed from the
________. -Answer>>>: top down
bottom up
Spoil banks must be at least ________ feet from the excavation. -Answer>>>:
2
Pipe must be bedded with a minimum of ______ inches, or _______ of the pipe
diameter, of tamped sand or gravel. -Answer>>>: 4 inches or 1/4 of the
pipe diameter
Do not place a new main into service until a bacteriological sample is analyzed
and shows negative results. One sample is required for each _______ feet of
completed main. -Answer>>>: 1000 feet
How often must dead-end mains be flushed? -Answer>>>: once per
month
Page 2 of 23
, TCEQ Class D Water Operator Exam – Certified
& Approved.
Flush carefully! Pressure surges created by rapid flow changes cause ______ and
possible ectensive damage to mains. -Answer>>>: water hammer
____________ is buildup of oxidized iron, calcium carbonate, or other chemicals
in mains. High pressure water, pigs or swabs, and chemicals are methods of
removing scale. -Answer>>>: Tuberculation
Does high or low pH make water more corrosive? -Answer>>>: low pH
Does high or low temperature make water more corrosive? -Answer>>>:
high temperature
T/F
When repairing a leak, dig one side deeper to form a pump sump. -Answer>>>:
True
T/F
When possible, repair the leak "hot", without turning off the valves. -
Answer>>>: True, Working the leak under pressure reduces risk of
contamination, reduces air in the main, and ensures the repair holds under
service.
A cross connection is a physical connection between a public water system and:
- another supply of _________ quality
- any source that may contain _________
-any water treated to a __________ degree -Answer>>>: unknown or
questionable
Page 3 of 23
& Approved.
The TCEQ requires distribution pressure to never fall below ______ psi, even
during emergencies. -Answer>>>: 20 psi
Under normal operating conditions, the distribution pressure must be at least
_____ psi. -Answer>>>: 35 psi
The ______ meter is the most common design for residential use. -Answer>>>:
positive displacement
Water mains must be no closer than _______ feet in all directions from sewers
or manholes. -Answer>>>: 9 feet
T/F
Parallel water and sewer lines must be laid in separate ditches. -Answer>>>:
True
The piece of pipe material cut from a main when a tap is made is called a
_______. -Answer>>>: coupon
For laying 6" or larger pipe, trenches must be at least ______ inches wide and
______ inches wider than the pipe diameter. -Answer>>>: 18 inches
12 inches
Water mains must be deep enough to have at least _______ inches of cover. -
Answer>>>: 24 inches
Page 1 of 23
,TCEQ Class D Water Operator Exam – Certified
& Approved.
The valve that connects the service line to the main is called the ________. It
cannot be operated from the ground surface. -Answer>>>: corporation
stop
The valve that connects the service line to the meter is called a ___________. It
can be operated from the meter box. -Answer>>>: curb stop or meter
stop
If shoring is used, it is installed from the ______ and removed from the
________. -Answer>>>: top down
bottom up
Spoil banks must be at least ________ feet from the excavation. -Answer>>>:
2
Pipe must be bedded with a minimum of ______ inches, or _______ of the pipe
diameter, of tamped sand or gravel. -Answer>>>: 4 inches or 1/4 of the
pipe diameter
Do not place a new main into service until a bacteriological sample is analyzed
and shows negative results. One sample is required for each _______ feet of
completed main. -Answer>>>: 1000 feet
How often must dead-end mains be flushed? -Answer>>>: once per
month
Page 2 of 23
, TCEQ Class D Water Operator Exam – Certified
& Approved.
Flush carefully! Pressure surges created by rapid flow changes cause ______ and
possible ectensive damage to mains. -Answer>>>: water hammer
____________ is buildup of oxidized iron, calcium carbonate, or other chemicals
in mains. High pressure water, pigs or swabs, and chemicals are methods of
removing scale. -Answer>>>: Tuberculation
Does high or low pH make water more corrosive? -Answer>>>: low pH
Does high or low temperature make water more corrosive? -Answer>>>:
high temperature
T/F
When repairing a leak, dig one side deeper to form a pump sump. -Answer>>>:
True
T/F
When possible, repair the leak "hot", without turning off the valves. -
Answer>>>: True, Working the leak under pressure reduces risk of
contamination, reduces air in the main, and ensures the repair holds under
service.
A cross connection is a physical connection between a public water system and:
- another supply of _________ quality
- any source that may contain _________
-any water treated to a __________ degree -Answer>>>: unknown or
questionable
Page 3 of 23
