California Water Environment Association (CWEA) Mechanical Technologist Grade 1 Exam | Latest Verified Questions and Detailed Answers

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California Water Environment Association (CWEA)
Mechanical Technologist Grade 1 Exam | Latest
Verified Questions and Detailed Answers

OVERVIEW DESCRIPTION:
The CWEA Mechanical Technologist Grade 1 exam assesses entry- to journey-level
maintenance technicians on foundational skills essential for safe and effective operation of
water/wastewater systems. The test emphasizes hands-on mechanical knowledge—
covering pumps, valves, bearings, motors, and preventive maintenance—alongside critical
safety procedures such as Lockout/Tagout (LOTO), confined space entry, and proper use of
PPE. Basic electrical principles (volts, amps, ohms, power calculations), hydraulic math
(flow rates, head, pressure conversions), tool usage, and blueprint reading are also core
components. Successful candidates demonstrate the ability to troubleshoot, perform
routine maintenance, interpret equipment curves and diagrams, and apply safety
regulations in real-world plant environments.

QUESTION 1
What is the first step in a Lockout/Tagout (LOTO) procedure before servicing

equipment?
A) Apply the lock and tag

B) Notify affected employees
C) Verify isolation by trying to start the equipment

D) Shut down the equipment using normal stopping procedures

CORRECT ANSWER: D


EXPERT RATIONALE: LOTO begins with an orderly shutdown using normal procedures
to safely prepare equipment for isolation; notification happens before shutdown, but

shutdown is the first procedural step per OSHA.

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QUESTION 2
Which type of Personal Protective Equipment (PPE) is required when working with

wastewater that may contain splashing hazards?
A) Leather gloves only

B) Safety glasses with side shields and a face shield
C) Ear plugs

D) Hard hat

CORRECT ANSWER: B


EXPERT RATIONALE: Wastewater splashes pose eye and face contamination risks;
safety glasses with side shields and a face shield provide combined protection.




QUESTION 3

A pump is rated at 10 horsepower. Assuming 100% efficiency, how many watts does it
consume? (1 HP = 746 W)

A) 746 W
B) 7,460 W

C) 74,600 W
D) 0.746 W


CORRECT ANSWER: B

EXPERT RATIONALE: 10 HP × 746 W/HP = 7,460 W. This is a direct unit conversion
commonly used in motor power calculations.

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QUESTION 4
What does "ohms" measure in an electrical circuit?

A) Voltage
B) Current

C) Resistance
D) Power


CORRECT ANSWER: C

EXPERT RATIONALE: Ohms are the SI unit of electrical resistance, opposing the flow of

current per Ohm’s law.




QUESTION 5
Which bearing type is most suitable for a pump shaft that must handle both radial and

thrust loads?
A) Sleeve bearing

B) Needle roller bearing
C) Angular contact ball bearing

D) Plain bearing

CORRECT ANSWER: C


EXPERT RATIONALE: Angular contact bearings are designed to accommodate
combined radial and axial (thrust) loads due to their raceway geometry.

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QUESTION 6
In a centrifugal pump, cavitation is most likely caused by:

A) High discharge pressure
B) Low net positive suction head available (NPSHa)

C) Excessive motor speed
D) Worn impeller wear rings


CORRECT ANSWER: B

EXPERT RATIONALE: When NPSHa drops below NPSHr, vapor bubbles form at the

impeller eye, leading to cavitation damage.




QUESTION 7
A technician measures 120 volts across a heater and 5 amps through it. What is the

resistance?
A) 600 Ω

B) 24 Ω
C) 125 Ω

D) 0.0417 Ω

CORRECT ANSWER: B


EXPERT RATIONALE: Using Ohm’s law R = V/I = 120 V / 5 A = 24 Ω.