EEI MASS Practice Test 2026 — Free EEI MASS Exam Prep Questions
MASS is the Edison Electric Institute aptitude battery that utilities use to screen applicants for power plant maintenance jobs such as mechanic, machinist, electrician, welder, pipefitter and I&C repairer. Our practice set covers all four MASS components: reading plant manuals, mechanical concepts, assembling objects and formula-based math.
EEI MASS format, scoring & key facts
Given by the hiring utility as part of its selection process. Four separately timed tests: Reading Comprehension 30 minutes, Mechanical Concepts 20 minutes, Assembling Objects 15 minutes and Mathematical Usage 7 minutes. Administration takes about two hours, or about three hours when given together with POSS. The tests are not adaptive.
| Full name | Power Plant Maintenance Positions Selection System (MASS), Edison Electric Institute |
|---|---|
| Tests | Reading Comprehension (36 Q, 30 min), Mechanical Concepts (44 Q, 20 min), Assembling Objects (20 Q, 15 min), Mathematical Usage (18 Q, 7 min) |
| Answer choices | Mechanical Concepts 3; Assembling Objects 4; Mathematical Usage 5, including N for not given |
| Total time | About 2 hours to administer; about 3 hours combined with POSS |
| Scoring | Number right with no guessing penalty, combined into one index score |
| Cutoff | Set by each employer |
| Jobs covered | Mechanic, machinist, electrician, welder, pipefitter, steelworker, rigger; instrument and control repairer; helper, painter, insulation worker |
| Plants | Fossil, nuclear and hydro power plants |
Facts last verified Oct 18, 2026. Source: lge-ku.com/sites/default/files/documents/EEI_MASS_Brochure.pdf. Always confirm details with EEI before your exam.
When can you take the EEI MASS?
There are no national test dates. Employers schedule testing after you apply for a power plant maintenance position that requires MASS.
Plan backwards from your exam date
What the EEI MASS covers
Every PrepBanq EEI MASS test mirrors the official domain weights.
Domain distribution
% of the exam| Content domain | Weight | ≈ Questions on exam | Our practice questions |
|---|---|---|---|
Reading Comprehension36 questions on five passages like power plant training and safety manuals: stated details, main idea, word meaning in context and inferences. | 31% | ~37 | 46 questions → |
Mechanical Concepts44 picture-based questions with three answers on cylinders and ports, rigging and lift points, gears, belts, pulleys, levers, fluids, pressure, heat and stability. | 37% | ~44 | 56 questions → |
Assembling Objects20 questions: choose which of four pictures shows the parts correctly assembled, by matching lettered points or fitting unlabeled pieces. | 17% | ~20 | 25 questions → |
Mathematical Usage18 very fast questions using conversion facts and relationships given at the start of the test; five choices including N (not given). | 15% | ~18 | 23 questions → |
How to register for the EEI MASS
Retake policy
Set by each employer. For example, LG&E-KU does not allow a retake of the same test within 90 days; Entergy requires at least 30 days between attempts and allows no more than two in 12 months.
Score release
Set by each employer; Entergy, for example, says results are typically available within five business days.
Credential renewal
Some employers accept a MASS passed with another company through an EEI Authorization to Release form.
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EEI MASS FAQ
How many questions are on the EEI MASS?
The EEI MASS has 118 questions and you have 1 hour 12 minutes to finish. Question types: Single-answer multiple choice. Reading Comprehension has 36 questions on five passages of power plant training-manual material. Mechanical Concepts has 44 picture-based questions with three answer choices each. Assembling Objects has 20 questions in which you choose which of four pictured assemblies shows the parts correctly put together, by matching lettered points or fitting puzzle-like pieces. Mathematical Usage has 18 questions worked from facts given at the start of the test, with five choices, the last being N (the correct answer is not given)..
How long is the EEI MASS exam?
Testing time for the EEI MASS is 1 hour 12 minutes.
What is the passing score for the EEI MASS?
EEI MASS passing standard: No universal pass mark: the four test scores are combined into one index score, and each employer sets its own cutoff. Score range: Number-right component scores combined into a single index score.
How much does the EEI MASS cost?
The EEI MASS registration fee is There is no public registration: the test is given by the employer to applicants for a position that requires it. Check the official site for current fees before you register.
What is on the EEI MASS?
The EEI MASS covers Reading Comprehension (about 31%), Mechanical Concepts (about 37%), Assembling Objects (about 17%), Mathematical Usage (about 15%).
Who administers the EEI MASS?
The EEI Power Plant Maintenance Selection System (MASS) is administered by EEI. Delivery: Given by the hiring utility as part of its selection process. Four separately timed tests: Reading Comprehension 30 minutes, Mechanical Concepts 20 minutes, Assembling Objects 15 minutes and Mathematical Usage 7 minutes. Administration takes about two hours, or about three hours when given together with POSS. The tests are not adaptive..
Can you retake the EEI MASS?
Set by each employer. For example, LG&E-KU does not allow a retake of the same test within 90 days; Entergy requires at least 30 days between attempts and allows no more than two in 12 months.
Is there a free EEI MASS practice test?
Yes. PrepBanq has 15 free EEI MASS practice tests with 150 exam-style questions in the real EEI MASS formats, and every answer is explained. No credit card is needed.
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