At Grade 2 the largest block is Safety, Tools and Equipment (25% of the exam).
For the electrical and instrumentation side of a plant: motor controls, instrumentation and calibration, programmable logic controllers, and the supervisory control and data acquisition systems that tie it together.
Start studying Grade 2| Content area | % of the exam | |
|---|---|---|
| Installation and Configuration | 18 | |
| Maintenance and Repair | 23 | |
| Safety, Tools and Equipment | 25 | |
| Documentation and Foundational Principles | 14 | |
| Administration and Training | 11 | |
| Math | 9 |
Instrumentation: 4–20 mA scaling · an original practice item written only from publicly available sources, not a real exam question
A pressure transmitter is ranged 0 to 150 psi over a 4–20 mA signal. It reads 14.8 mA. What pressure does that represent?
B. 101 psi
Percent of span = (14.8 − 4) ÷ (20 − 4) = 10.8 ÷ 16 = 67.5%. Pressure = 0.675 × 150 psi = 101 psi. 111 scales from 0 mA (14.8 ÷ 20 × 150), forgetting the 4 mA live zero; 81 subtracts the 4 mA but divides by 20 instead of the 16 mA span; 139 divides by the span but never subtracts the 4 mA (14.8 ÷ 16 × 150).
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Topic coverage follows Electrical & Instrumentation Technologist Candidate Handbook, Version 04.25.22.01 (California Water Environment Association, effective April 2022). Practice questions are written only from publicly available sources (that outline and the regulations and references it cites); they are not real exam questions, which are confidential. Check current application requirements, fees and exam dates on the certifying body's own page: official certification page.
Questions, flashcards, and explanations are AI-written from publicly available sources only: the exam content outlines and candidate materials each certifying body publishes without restriction, and the regulations and technical references they cite. No confidential material is used, including actual exam questions, recollections of any exam sat by the author, or any handbook or document released under a confidentiality agreement. Content is then put through repeated review — regulatory values checked against primary sources, every calculation recomputed, and errors corrected — plus spot checks by the author, who holds California water operator certifications and a California civil engineering licence. Those spot checks are sampling, not a professional review: nothing here is stamped, sealed, or offered as engineering advice, and not every item has been individually verified, so mistakes can still slip through.