CWEA Mechanical Maintenance Technologist Grade 3
Study Guide Comprehensive Resource To Help You Ace
2026-2027 Exams Includes Frequently Tested Questions
With ELABORATED 100% Correct COMPLETE SOLUTIONS
Guaranteed Pass First Attempt!! Current Update!!
Instant Download Pdf
1. A condition which can cause cavitation in a pump is:
a. an air leak on suction side
b. clear water being pumped
c. a fully opened suction valve
d. operating within design curve
Correct Answer: a. an air leak on suction side
2. Where is a check valve for a lift station pump installed?
a. Between the discharge isolation valve and the discharge port of the pump
b. Between the suction isolation valve and the line through the wet well wall
c. Between the suction port of the pump and the suction isolation valve
d. Downstream, just beyond the discharge isolation valve for the pump
Correct Answer: a. Between the discharge isolation valve and the discharge
port of the pump
3. A lift station pump is not running and breakers will not reset. Most likely
cause is:
a. Misaligned belt drive
b. Improper wet well sensor adjustment
c. Clogged pump
,d. Blown fuse
Correct Answer: d. Blown fuse
4. The electrical disconnect for a pumping station motor can trip under which
condition?
a. Pump cavitation
b. Low temperature
c. Strike by lightning
d. Worn packing
Correct Answer: c. Strike by lightning
5. "Enclosed", "open", and "semi-closed" describe what pump part?
a. Stuffing box
b. Lantern ring
c. Impeller
d. Bearings
Correct Answer: c. Impeller
6. A typical bubbler type controller failure is:
a. Air compressor failed
b. Broken float line
c. Short in electrode leads
d. Electrode coated with grease
Correct Answer: a. Air compressor failed
7. The most common type of pump used in lift stations is:
a. Piston
b. Ejector
c. Centrifugal
, d. Diaphragm
Correct Answer: c. Centrifugal
8. Pump vibrations may be caused by improper motor-pump:
a. alignment
b. curves
c. piping
d. power factor
Correct Answer: a. alignment
9. A pump type not seriously damaged if discharge valve is closed briefly is:
a. Centrifugal pump
b. Diaphragm pump
c. Piston pump
d. Plunger pump
Correct Answer: a. Centrifugal pump
10. A mechanical ventilation system in a wet well should exchange air how many
times per hour?
a. 10
b. 20
c. 30
d. 60
Correct Answer: c. 30
11. A pump delivering less than expected discharge rate may be due to:
a. Speed of motor too high
b. Pump is primed
c. Impeller clogged
Study Guide Comprehensive Resource To Help You Ace
2026-2027 Exams Includes Frequently Tested Questions
With ELABORATED 100% Correct COMPLETE SOLUTIONS
Guaranteed Pass First Attempt!! Current Update!!
Instant Download Pdf
1. A condition which can cause cavitation in a pump is:
a. an air leak on suction side
b. clear water being pumped
c. a fully opened suction valve
d. operating within design curve
Correct Answer: a. an air leak on suction side
2. Where is a check valve for a lift station pump installed?
a. Between the discharge isolation valve and the discharge port of the pump
b. Between the suction isolation valve and the line through the wet well wall
c. Between the suction port of the pump and the suction isolation valve
d. Downstream, just beyond the discharge isolation valve for the pump
Correct Answer: a. Between the discharge isolation valve and the discharge
port of the pump
3. A lift station pump is not running and breakers will not reset. Most likely
cause is:
a. Misaligned belt drive
b. Improper wet well sensor adjustment
c. Clogged pump
,d. Blown fuse
Correct Answer: d. Blown fuse
4. The electrical disconnect for a pumping station motor can trip under which
condition?
a. Pump cavitation
b. Low temperature
c. Strike by lightning
d. Worn packing
Correct Answer: c. Strike by lightning
5. "Enclosed", "open", and "semi-closed" describe what pump part?
a. Stuffing box
b. Lantern ring
c. Impeller
d. Bearings
Correct Answer: c. Impeller
6. A typical bubbler type controller failure is:
a. Air compressor failed
b. Broken float line
c. Short in electrode leads
d. Electrode coated with grease
Correct Answer: a. Air compressor failed
7. The most common type of pump used in lift stations is:
a. Piston
b. Ejector
c. Centrifugal
, d. Diaphragm
Correct Answer: c. Centrifugal
8. Pump vibrations may be caused by improper motor-pump:
a. alignment
b. curves
c. piping
d. power factor
Correct Answer: a. alignment
9. A pump type not seriously damaged if discharge valve is closed briefly is:
a. Centrifugal pump
b. Diaphragm pump
c. Piston pump
d. Plunger pump
Correct Answer: a. Centrifugal pump
10. A mechanical ventilation system in a wet well should exchange air how many
times per hour?
a. 10
b. 20
c. 30
d. 60
Correct Answer: c. 30
11. A pump delivering less than expected discharge rate may be due to:
a. Speed of motor too high
b. Pump is primed
c. Impeller clogged
