Page 1 of 45
MECHANICAL TECHNOLOGIST GRADE 1
CWEA 2026 CERTIFICATION EXAM
COMPLETE CURRENT TESTING (218)
QUESTIONS AND DETAILED CORRECT
ANSWERS|TOP-RATED A+.
CWEA
Prepare for your Mechanical Technologist Grade 1 CWEA
Certification Exam with this focused study guide. It covers
mechanical systems, hydraulics, pumps, valves,
instrumentation, and maintenance procedures relevant to water
and wastewater operations. Emphasizes troubleshooting, safety
protocols, and practical application of mechanical principles.
Suitable for professionals preparing for Grade 1 certification
through the California Water Environment Association.
What is a needle valve used for? ✓ ✓ ...... ANSWER .......
A needle valve is a type of valve that uses a tapered needle
to control the flow of fluid. It is often used in applications
where precise control of the flow rate is required, such as in
laboratory and industrial settings. The unique feature of the
valve is the structure of a small plunger with the shape of a
needle. The plunger features a small handle to operate in the
easy and precise operation of the valve.
, Page 2 of 45
Learn more:
What is a ball valve used for? ✓ ✓ ...... ANSWER ....... A
ball valve consists of a hollow, perforated, and pivoting ball.
When the hole through the middle of the ball aligns with the
flow inlet, the valve is open, allowing fluid to pass through.
To close the valve, the ball is pivoted 90 degrees by the valve
handle, blocking the flow.
A Sodium hypochlorite tank is full at 23,000 gallons. It's
current level is at 1,200 gallons. How many gallons will the
delivery driver need to add in order to bring it to 70%
capacity? ✓ ✓ ...... ANSWER ....... 14,900 gallons need
to be added to the tank in order for it to be 70% full
What is 100 degrees Celsius in Fahrenheit? ✓ ✓ ......
ANSWER ....... 212 degrees Fahrenheit
If 17.32v are applied across a resistance of 50 ohms, how
much power is expended in the resistor? ✓ ✓ ...... ANSWER
....... 6 Watts
, Page 3 of 45
Volt = amp x ohms
17.32 = amp x 50
17.32/50 = 0.34 = amps
Watts = volts x amps
Watts = 17.32 x 0.34
Watts = 6
A standard steel plate is 4ft x 8ft x 1 inch thick. If steel
weighs 490 lbs/ft^3, what is the total weight of this plate? ✓
✓ ...... ANSWER ....... 1/12 = 0.083
4 x 8 x 0.083 = 2.656
2.656 x 490 = 1,301.44 lbs
What is the volume in cubic feet of carbon media that is 6
feet thick in a clarifier that has a 50 foot diameter and is 20
feet deep? Round the answer to the nearest cubic foot ✓ ✓
...... ANSWER ....... 0.785 x 50 x 50 x 6 = 11,775 ft^3
, Page 4 of 45
A 150 watt, 120 volt lamp burns constantly for 8 hours at a
rated voltage. What is the energy used in watts/hour? ✓ ✓
...... ANSWER ....... 1,200 Watts/hour
The property of an electrical circuit restricts the flow of
current and ....... ✓ ✓ ...... ANSWER ....... resistance
What can burn the insulation on supply connections at the
motor starter? ✓ ✓ ...... ANSWER ....... The connections
are loose or have poor contacts
Where do you start troubleshooting when an electric motor
fails to operate? ✓ ✓ ...... ANSWER ....... At the power
source
What does NEC stand for? ✓ ✓ ...... ANSWER .......
National Electrical Code
What is a pipe union typically used for? ✓ ✓ ...... ANSWER
....... to connect pipe
MECHANICAL TECHNOLOGIST GRADE 1
CWEA 2026 CERTIFICATION EXAM
COMPLETE CURRENT TESTING (218)
QUESTIONS AND DETAILED CORRECT
ANSWERS|TOP-RATED A+.
CWEA
Prepare for your Mechanical Technologist Grade 1 CWEA
Certification Exam with this focused study guide. It covers
mechanical systems, hydraulics, pumps, valves,
instrumentation, and maintenance procedures relevant to water
and wastewater operations. Emphasizes troubleshooting, safety
protocols, and practical application of mechanical principles.
Suitable for professionals preparing for Grade 1 certification
through the California Water Environment Association.
What is a needle valve used for? ✓ ✓ ...... ANSWER .......
A needle valve is a type of valve that uses a tapered needle
to control the flow of fluid. It is often used in applications
where precise control of the flow rate is required, such as in
laboratory and industrial settings. The unique feature of the
valve is the structure of a small plunger with the shape of a
needle. The plunger features a small handle to operate in the
easy and precise operation of the valve.
, Page 2 of 45
Learn more:
What is a ball valve used for? ✓ ✓ ...... ANSWER ....... A
ball valve consists of a hollow, perforated, and pivoting ball.
When the hole through the middle of the ball aligns with the
flow inlet, the valve is open, allowing fluid to pass through.
To close the valve, the ball is pivoted 90 degrees by the valve
handle, blocking the flow.
A Sodium hypochlorite tank is full at 23,000 gallons. It's
current level is at 1,200 gallons. How many gallons will the
delivery driver need to add in order to bring it to 70%
capacity? ✓ ✓ ...... ANSWER ....... 14,900 gallons need
to be added to the tank in order for it to be 70% full
What is 100 degrees Celsius in Fahrenheit? ✓ ✓ ......
ANSWER ....... 212 degrees Fahrenheit
If 17.32v are applied across a resistance of 50 ohms, how
much power is expended in the resistor? ✓ ✓ ...... ANSWER
....... 6 Watts
, Page 3 of 45
Volt = amp x ohms
17.32 = amp x 50
17.32/50 = 0.34 = amps
Watts = volts x amps
Watts = 17.32 x 0.34
Watts = 6
A standard steel plate is 4ft x 8ft x 1 inch thick. If steel
weighs 490 lbs/ft^3, what is the total weight of this plate? ✓
✓ ...... ANSWER ....... 1/12 = 0.083
4 x 8 x 0.083 = 2.656
2.656 x 490 = 1,301.44 lbs
What is the volume in cubic feet of carbon media that is 6
feet thick in a clarifier that has a 50 foot diameter and is 20
feet deep? Round the answer to the nearest cubic foot ✓ ✓
...... ANSWER ....... 0.785 x 50 x 50 x 6 = 11,775 ft^3
, Page 4 of 45
A 150 watt, 120 volt lamp burns constantly for 8 hours at a
rated voltage. What is the energy used in watts/hour? ✓ ✓
...... ANSWER ....... 1,200 Watts/hour
The property of an electrical circuit restricts the flow of
current and ....... ✓ ✓ ...... ANSWER ....... resistance
What can burn the insulation on supply connections at the
motor starter? ✓ ✓ ...... ANSWER ....... The connections
are loose or have poor contacts
Where do you start troubleshooting when an electric motor
fails to operate? ✓ ✓ ...... ANSWER ....... At the power
source
What does NEC stand for? ✓ ✓ ...... ANSWER .......
National Electrical Code
What is a pipe union typically used for? ✓ ✓ ...... ANSWER
....... to connect pipe
