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NEW MEXICO WATER OPERATOR CERTIFICATION ACTUAL
EXAM, STUDY GUIDE AND PRACTICE EXAM 2025/2026
NEWEST ACTUAL EXAM WITH COMPLETE QUESTIONS AND
VERIFIED ANSWERS |ALREADY GRADED A+|
What is a principal problem associated with preliminary treatment
screening? - ANSWER-Corrosion, clogging
What is the formula for kinetic head? - ANSWER-V²/2g
What type of centrifugal pump can have water enter from two
sides (double suction)? - ANSWER-Split case pump
What type of pump has the ability to rotate its discharge 360°? -
ANSWER-End suction pump
A split case pump has three impellers. Which type of multistage
pump is this? - ANSWER-Three stage
A load, perpendicular to a pump shaft, applied to a bearing is
called? - ANSWER-Radial load
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What type of coupling is used when the coupled shafts are of two
different sizes? - ANSWER-Flange coupling
Excessive upthrust on line shaft turbines is caused by? -
ANSWER-Pumping too much water
Besides providing the enclosure for the impeller, the volute case
is also cast and machined to provide a seat for the? - ANSWER-
Impeller rings
What is a type of rigid coupling? - ANSWER-Split coupling
The bearings that maintain the axial positioning of a shaft are
called? - ANSWER-Thrust bearings
What type of bearing can operate well against radial loads, but
can only withstand very low thrust loads? - ANSWER-Self-aligning
double-row ball bearings
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A pump fails to prime because the suction lift is too high. What is
the best solution?
A. inspect, clean, or repair the priming unit
B. open suction piping air bleed off valve
C. check external water seal unit
D. reevaluate the pump's requirements and correct the condition -
ANSWER-D. reevaluate the pump's requirements and correct the
condition
What type of pump has little chance of losing its prime, but has
the disadvantage of having a lack of access for maintenance or
repair? - ANSWER-Submersible pump
What type of pump adds energy to the fluid flow intermittently? -
ANSWER-Positive displacement pump
Diaphragm pumps do not work very well if they have to lift liquids
more than about? - ANSWER-4 feet
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The streaming current detector is based on what principle? -
ANSWER-Electromotive principle
What does the streaming current detector actually measure for
determining the effectiveness of the coagulant chemical? -
ANSWER-Electrical resistance
What is the normal rotational speed of a microstrainer? -
ANSWER-5 rpm
A low vacuum condition on a chlorinator can be caused by? -
ANSWER-A failed injector
A high vacuum condition on a chlorinator can be caused by? -
ANSWER-An empty chlorine container
Which metal has the highest corrosion potential?
A. aluminum
B. copper
C. cast iron
NEW MEXICO WATER OPERATOR CERTIFICATION ACTUAL
EXAM, STUDY GUIDE AND PRACTICE EXAM 2025/2026
NEWEST ACTUAL EXAM WITH COMPLETE QUESTIONS AND
VERIFIED ANSWERS |ALREADY GRADED A+|
What is a principal problem associated with preliminary treatment
screening? - ANSWER-Corrosion, clogging
What is the formula for kinetic head? - ANSWER-V²/2g
What type of centrifugal pump can have water enter from two
sides (double suction)? - ANSWER-Split case pump
What type of pump has the ability to rotate its discharge 360°? -
ANSWER-End suction pump
A split case pump has three impellers. Which type of multistage
pump is this? - ANSWER-Three stage
A load, perpendicular to a pump shaft, applied to a bearing is
called? - ANSWER-Radial load
, Page |2
What type of coupling is used when the coupled shafts are of two
different sizes? - ANSWER-Flange coupling
Excessive upthrust on line shaft turbines is caused by? -
ANSWER-Pumping too much water
Besides providing the enclosure for the impeller, the volute case
is also cast and machined to provide a seat for the? - ANSWER-
Impeller rings
What is a type of rigid coupling? - ANSWER-Split coupling
The bearings that maintain the axial positioning of a shaft are
called? - ANSWER-Thrust bearings
What type of bearing can operate well against radial loads, but
can only withstand very low thrust loads? - ANSWER-Self-aligning
double-row ball bearings
, Page |3
A pump fails to prime because the suction lift is too high. What is
the best solution?
A. inspect, clean, or repair the priming unit
B. open suction piping air bleed off valve
C. check external water seal unit
D. reevaluate the pump's requirements and correct the condition -
ANSWER-D. reevaluate the pump's requirements and correct the
condition
What type of pump has little chance of losing its prime, but has
the disadvantage of having a lack of access for maintenance or
repair? - ANSWER-Submersible pump
What type of pump adds energy to the fluid flow intermittently? -
ANSWER-Positive displacement pump
Diaphragm pumps do not work very well if they have to lift liquids
more than about? - ANSWER-4 feet
, Page |4
The streaming current detector is based on what principle? -
ANSWER-Electromotive principle
What does the streaming current detector actually measure for
determining the effectiveness of the coagulant chemical? -
ANSWER-Electrical resistance
What is the normal rotational speed of a microstrainer? -
ANSWER-5 rpm
A low vacuum condition on a chlorinator can be caused by? -
ANSWER-A failed injector
A high vacuum condition on a chlorinator can be caused by? -
ANSWER-An empty chlorine container
Which metal has the highest corrosion potential?
A. aluminum
B. copper
C. cast iron
