On this website, you’ll find a prominently placed button at the top that gives you full access to the Plant Operator Selection System (POSS) practice exam. Directly beneath it, there’s a detailed practice test available, offering a thorough review of the exam material. Engaging with these tests is an excellent way to demonstrate your knowledge, identify areas needing improvement, and hone your study strategy.

To further enhance your preparation, especially in areas that require additional focus, we have developed specialized quizzes. These quizzes are meticulously designed to concentrate on specific aspects of the POSS exam, ensuring a focused and effective preparation experience.

Plant Operator Selection System (POSS) Domain Exams

The Plant Operator Selection System (POSS) exam is a critical assessment for those aspiring to become plant operators in power plants. The POSS exam evaluates various skills necessary for operations roles within energy production facilities. 

Here’s a breakdown of the exam’s key domains:

Domain 1: Reading Comprehension

  • Number of Questions: 36
  • Description: This section tests the ability to understand and interpret written instructions, reports, and other texts relevant to plant operations. It’s vital for ensuring that operators can follow safety procedures and operational protocols.

Welcome to your POSS Domain 1: Reading Comprehension

Domain 2: Mechanical Concepts

  • Number of Questions: 44
  • Description: Focuses on principles of mechanics, such as forces, movements, and the behavior of machines. This area assesses the ability to understand and apply mechanical concepts to maintain and troubleshoot equipment in a power plant setting.

Welcome to your POSS Domain 2: Mechanical Concepts

Domain 3: Mathematical Usage

  • Number of Questions: 20
  • Description: Evaluates basic mathematical skills, particularly in arithmetic, algebra, and geometry, as they relate to technical and operational calculations that plant operators must perform regularly.

Welcome to your POSS Domain 3: Mathematical Usage

Domain 4: Figural Reasoning

  • Number of Questions: 20
  • Description: Tests the ability to reason with figures and diagrams, essential for understanding schematics, blueprints, and operational layouts in a plant environment.

Welcome to your POSS Domain 4: Figural Reasoning

Exam Domain# of QuestionsDescription
Reading Comprehension36Tests ability to understand written instructions, reports, and texts relevant to plant operations.
Mechanical Concepts44Focuses on principles of mechanics, essential for maintaining and troubleshooting equipment.
Mathematical Usage20Evaluates arithmetic, algebra, and geometry skills for technical and operational calculations.
Figural Reasoning20Tests reasoning with figures and diagrams, crucial for understanding schematics and blueprints.

Additional Information

  • Time Limit: The exam generally has a time limit, which might be tight, pushing candidates to work efficiently.
  • Passing Score: Varies by company and position; typically, the organization will set specific benchmarks aligned with job requirements.
  • Preparation Materials: Official study guides and sample tests are often provided by the administering body. These resources are crucial for familiarizing oneself with the types of questions and the format of the exam.

Plant Operator Selection System (POSS) Exam Breakdown

The Plant Operator Selection System (POSS) Exam is a pre-employment assessment developed by the Edison Electric Institute (EEI) to evaluate candidates for operational roles in power plants, including nuclear, hydroelectric, and fossil fuel facilities. The POSS exam is designed to test a range of cognitive skills that are essential for competent performance in such roles.

Key Components of the POSS Exam

The POSS test is structured into multiple sections, each targeting specific skills:

  1. Reading Comprehension: This section involves answering questions based on five short passages, usually related to technical concepts found in utility training manuals. It tests the candidate’s ability to understand and interpret written information.
  2. Mechanical Concepts: In this section, candidates are assessed on their understanding of basic mechanical principles through questions about mechanical devices like pulleys, gears, and levers.
  3. Mathematical Usage: This section comes in two forms: a shorter version and a longer version. The shorter version tests basic computational skills using standard measures, while the longer version includes more complex problem-solving with algebra and word problems.
  4. Tables and Graphs: This tests the ability to interpret and analyze data presented in tables and graphs, involving calculations and visual data interpretation.
  5. Figural Reasoning: Also known as the Spatial Ability test, this section assesses the ability to visualize and manipulate shapes and figures in space.

Preparation and Strategy

Preparation for the POSS exam involves familiarizing yourself with the test format and practicing with sample questions. Effective strategies include taking practice tests to identify weak areas, reviewing concepts thoroughly, and simulating testing conditions to improve timing and accuracy.


Several resources are available for POSS preparation, including study guides, practice tests, and courses designed specifically to help candidates succeed. These resources provide detailed explanations, practice questions, and testing strategies. Websites like Mometrix and JobTestPrep offer comprehensive study materials and practice tests tailored to the POSS exam.

The Princeton Review CFA Study Material

To become certified as a Plant Operator through the Plant Operator Selection System (POSS), you’ll need to pass the POSS test, which is used by power plant facilities to assess the aptitude and skills of prospective employees. The POSS test is typically a requirement for obtaining a position in plants that utilize fossil, hydroelectric, or nuclear power.

Steps to Prepare for the POSS Test:

  1. Understand the Test Format: The POSS test includes sections on reading comprehension, mechanical concepts, mathematical usage, figural reasoning, and tables and graphs. Each section has a different number of questions and time limits. For example, the mechanical concepts section consists of 44 questions with a 20-minute time limit​.
  2. Study and Preparation: It’s crucial to prepare thoroughly for the POSS test. You can use study guides and online prep courses that provide practice questions, review lessons, instructional videos, and more. Mometrix offers a comprehensive online POSS Prep Course that includes over 750 practice questions and various learning tools​​.
  3. Practice Tests: Taking practice tests is one of the most effective ways to prepare. These tests help identify areas where you need improvement and familiarize you with the test format and types of questions you will encounter​​.
  4. Test Day Strategy: Start by taking practice tests without time constraints and gradually move to more timed conditions to simulate the test day environment. This helps in managing time effectively during the actual test.
  5. Registration and Test Taking: The POSS test cannot be taken at any time but is scheduled by the hiring company as part of their recruitment process. You usually won’t need to pay a fee to take the test, as it’s offered during the hiring process.

Our Experience Teaching Plant Operator Selection System (POSS) Candidates To Pass The Exam

At Career Employer, developing our Plant Operator Selection System (POSS) practice tests has been a remarkable journey, marked by both significant achievements and challenging obstacles. This project was shaped by the extensive range of topics featured in the exam and tailored to address the unique needs of our learners.

We have carefully crafted every aspect of our approach to ensure that each learner is fully prepared to excel in the exam. Our commitment to providing a comprehensive educational experience is reflected in the wide variety and depth of our practice materials, emphasizing our dedication to our students’ success.

Teaching the Plant Operator Selection System (POSS) certification can be a comprehensive and strategic endeavor for a lecturer, particularly because this certification is designed to assess the skills and abilities necessary for a career as a power plant operator. 

Here’s a detailed perspective on how a lecturer might approach this:

  1. Understanding the Certification Requirements: First, the lecturer must have a deep understanding of what the POSS test entails. This includes knowledge of the test’s components such as reading comprehension, mathematical usage, mechanical concepts, and figural reasoning. Familiarizing students with these areas is crucial.
  2. Curriculum Development: Developing a curriculum that covers all the necessary topics is essential. This might include detailed lessons on mechanical principles, practice in solving complex word problems, and exercises in logical reasoning and pattern recognition.
  3. Resource Integration: Utilizing a variety of teaching resources such as textbooks, online modules, and interactive quizzes can enhance the learning experience. The lecturer may also incorporate simulations and practical demonstrations to help students grasp mechanical and technical concepts more effectively.
  4. Practice Tests and Feedback: Conducting regular practice tests can provide critical feedback to students and help them identify their strengths and weaknesses. It also familiarizes students with the test format and time constraints, reducing test anxiety and improving performance.
  5. Personalized Instruction: Given the diverse skill sets and learning paces of students, personalized instruction can be beneficial. This may involve additional tutoring sessions for students who need more help in specific areas.
  6. Collaboration and Study Groups: Encouraging students to form study groups can foster a collaborative learning environment. This allows students to learn from each other and tackle complex problems collectively.
  7. Motivation and Support: Maintaining student motivation through the preparation process is crucial. This can be achieved by setting clear goals, providing encouragement, and recognizing achievements to boost confidence.

At Career Employer, our practice tests for the Plant Operator Selection System (POSS) certification draw on the vast expertise and experience of our team of seasoned plant operations professionals. These experts, deeply familiar with the nuances of the POSS exam, have meticulously crafted these resources. Their extensive knowledge in the field has empowered them to guide over 1,000 plant operator specialists towards successfully passing the POSS certification exam.

Our team is composed of veteran professionals, each with over ten years of dedicated experience in plant operations. This deep well of expertise ensures that our practice materials are not only expertly informed but also exceptionally effective in preparing candidates for success in their certification pursuits.

Effective Study Strategies and Methods

To prepare effectively for the Plant Operator Selection System (POSS) exam, it’s crucial to focus on several key areas and utilize specific study strategies. 

Here are some recommended approaches based on insights from various sources:

  1. Understand the Test Structure: The POSS exam consists of multiple-choice questions spread over several sections, including Reading Comprehension, Mechanical Concepts, Mathematical Usage, and Figural Reasoning. Familiarizing yourself with the format and types of questions you’ll encounter can significantly boost your confidence and performance​.
  2. Practice with Mock Exams: Regularly taking practice tests is one of the most effective ways to prepare. This helps you understand the exam’s timing and difficulty, improve your speed, and identify areas where you need more study. Websites like Mometrix and JobTestPrep offer comprehensive practice resources and mock exams tailored to the POSS test.
  3. Focus on Key Concepts:
    • Mechanical Concepts: Study basic principles such as levers, pulleys, and gears, as well as more complex systems like kinematics and kinetics​​.
    • Mathematical Usage: Ensure you are comfortable with basic arithmetic, algebra, geometry, and the ability to solve equations and word problems under time pressure​.
    • Figural Reasoning: Practice identifying patterns and solving problems with picture series, picture comparison, and picture progression.
    • Reading Comprehension: Improve your ability to quickly read and comprehend technical passages, which is essential for the Reading Comprehension section​.
  4. Study Guides and Online Courses: Utilize resources like the Mometrix POSS Prep Course, which provides extensive content reviews, practice questions, and test-taking strategies. These guides often include tips on managing test anxiety and scheduling study sessions effectively​.
  5. General Test-Taking Strategies: Learn to manage your time effectively during the test, use a process of elimination for tougher questions, and practice making educated guesses when necessary. Always answer every question, as there are no penalties for incorrect answers​.
  6. Health and Wellbeing: Don’t underestimate the importance of physical preparation. Ensure you get a good night’s sleep before the test, eat a balanced breakfast, and stay hydrated to maintain concentration during the exam​​.


Exam FeeNo direct cost for the exam as it is covered by employers during the hiring process.Free
Study MaterialsIncludes books, online courses, and practice tests. Options available from various providers like Mometrix.USD 40 – USD 100+
Prep CoursesOnline prep courses providing comprehensive study resources including lessons, videos, and practice questions.Varies (Typically USD 40 – USD 100)
Additional ResourcesFree resources available such as basic practice questions and study tips on websites like StudyGuideZone and Aptitude Test Prep.Free

The cost of preparing for and taking the Plant Operator Selection System (POSS) exam varies, as it encompasses a range of potential expenses including study materials, practice tests, and preparatory courses.

Here’s a breakdown:

Exam Fees:

The POSS exam itself does not have a fee if taken as part of a hiring process within electric companies. The companies offering these positions typically cover the costs as the exam is a part of their recruitment assessment​​.

Study Materials and Courses:

  • Prep Courses: Prices for comprehensive online prep courses like those offered by Mometrix can vary. For instance, Mometrix offers a POSS Prep Course which includes review lessons, practice questions, and instructional videos. The cost of such courses isn’t specified in the sources, but similar courses typically range from USD 40 to USD 100 or more, depending on the depth of the resources and the duration of access​​.
  • Study Guides and Practice Tests: You can purchase study guides and practice tests separately. For example, the “Plant Operator Selection System Secrets Study Guide” is available for prices around USD 48.23 . Additionally, other platforms offer various practice tests and study materials, which can provide good preparation at different price points​​.

Additional Resources: 

Many free resources are also available, including practice questions and basic prep tips on websites like StudyGuideZone and Aptitude Test Prep​​. These can be a good starting point before investing in more comprehensive paid courses or materials.

Given this range of options, you can expect to spend anything from a few dollars on simple study guides to several hundred dollars if opting for full comprehensive courses and multiple practice materials. It’s advisable to start with free resources and practice tests to determine what additional materials or support might be necessary based on your performance and comfort with the test content.

Reliable Study Materials and Resources

Preparing for the Plant Operator Selection System (POSS) certification exam can be effectively managed through a combination of online resources that provide study guides, practice questions, and comprehensive preparatory courses. 

Here are some of the best resources available online:

  1. Mometrix Test Preparation offers extensive materials including practice questions, a study guide, and detailed explanations of answers. They provide a structured approach to learning and revising the key topics you will face on the exam. Their materials also include strategies for tackling the exam effectively.
  2. Study Guide Zone offers a POSS Prep Course which covers all necessary topics with over 750 practice questions and instructional videos. It is a thorough resource for anyone looking to deeply understand the POSS test components and improve their readiness.
  3. JobTestPrep provides a specialized POSS test preparation package that includes practice tests that simulate the actual exam. This can help familiarize you with the test format and types of questions you might encounter. Their resources also include time management strategies and tips on how to handle the pressure of the test environment​​.
  4. Practice4Me and Aptitude Test Prep offer online preparation tools and tips, with detailed breakdowns of each test section, including Reading Comprehension, Mathematical Usage, Mechanical Concepts, and Figural Reasoning. These resources are aimed at boosting both your knowledge base and test-taking confidence​​.
  5. Assessment Centre HQ and Test Prep Preview provide free practice questions and study guides. These platforms are particularly helpful for understanding the format and demands of the test, with tips on how to approach studying and maximizing your performance​.

Each of these resources offers unique tools and strategies to prepare for the POSS exam, so it’s beneficial to explore multiple options to find what best suits your learning style and preparation needs. Using these resources will help you build a strong foundation in the necessary knowledge areas and improve your test-taking strategies to enhance your chances of success on the exam.

Tips for Exam Day

To succeed on the Plant Operator Selection System (POSS) exam, it’s essential to prepare thoroughly and manage your time effectively during the test. 

Here are some focused strategies to help you perform your best on exam day:

  1. Understand the Test Structure: The POSS test includes sections on Reading Comprehension, Mechanical Concepts, Mathematical Usage, and Figural Reasoning. Each section has a strict time limit, so familiarize yourself with the types of questions each section will ask and the allowed time​.
  2. Practice Strategically: Utilize resources that offer a large number of practice questions and simulations of the actual exam. Websites like Mometrix offer comprehensive preparation materials, including practice tests and review videos which cover the test’s subject matter extensively​.
  3. Time Management: You can skip questions and return to them later, which can help manage time more effectively. Prioritize easier questions to ensure you collect as many correct answers as possible before tackling harder ones​.
  4. Guessing Strategy: Since there is no penalty for wrong answers, it’s advisable to answer every question. If you’re unsure, make an educated guess instead of leaving it blank.
  5. Exam Day Preparation: On the day of the exam, ensure you’re well-rested, hydrated, and have eaten a good meal. Arrive at the test center early to avoid any last-minute stress. Remember, calculators and other electronic devices are not permitted, so practice your calculations by hand in advance​​.
  6. Stay Calm and Focused: Test anxiety can be a significant barrier. Engage in relaxation techniques such as deep breathing or positive visualization right before the test to keep your nerves under control.

Post-Exam: Next Steps

Here are additional strategies you might consider after taking the POSS exam to further enhance your learning and preparation for future assessments:

  1. Group Review Sessions: Participate in or organize group study sessions with fellow test-takers. This allows for diverse perspectives on the exam content, sharing of effective study strategies, and clarification of difficult concepts. Group discussions can often reveal insights or understanding that you might miss when studying alone.
  2. Seek Feedback from Instructors or Mentors: If possible, discuss your performance with an instructor or a mentor. They can offer professional insights into your exam strategies, help clarify misunderstandings, and provide guidance on how to improve in specific areas.
  3. Use of Digital Tools and Resources: Leverage educational technology tools such as quiz apps, online flashcards, and simulation software. These tools can provide additional practice and feedback, helping you to reinforce your knowledge and address gaps in your understanding.
  4. Scheduled Regular Practice Tests: Regularly taking practice tests can significantly help in building exam readiness. These tests not only familiarize you with the exam format and types of questions but also help in timing your responses effectively during the actual exam.
  5. Maintain a Learning Diary: Keep a diary or journal of what you learn each day. This not only reinforces memory but also helps you track your progress over time. Reflecting on this diary can help you identify effective learning patterns and strategies that work best for you.
  6. Professional Development Workshops or Seminars: Attend workshops or seminars focused on the skills required for plant operators. These sessions can provide both theoretical knowledge and practical skills, enriching your professional expertise and readiness for operational challenges.

By integrating these strategies, you’ll not only better understand your current performance and areas for improvement but also develop a robust framework for continuous learning and professional growth. These practices are designed to make your study sessions more effective and to boost your confidence in handling similar professional exams in the future.


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  2. “Plant Operator Selection System (POSS) Test.” Study Guide Zone. https://www.studyguidezone.com/plant-operator-selection-system-poss-test/
  3. “POSS Practice Test.” Mometrix Academy. https://www.mometrix.com/academy/poss-practice-test/
  4. “Plant Operator Selection System Test.” Practice Test Geeks. https://practicetestgeeks.com/plant-operator-selection-system-test/
  5. “Study Guide Zone.” Study Guide Zone. http://www.studyguidezone.com/
  6. “Practice Test Geeks.” Practice Test Geeks. http://www.practicetestgeeks.com/
  7. “EEI POSS Test.” Practice 4 Me. https://www.practice4me.com/eei-poss-test/
  8. “Study Guides for POSS.” Mometrix. https://www.mometrix.com/studyguides/poss/
  9. “POSS Test Preparation.” JobTestPrep. https://www.jobtestprep.com/poss-test
  10. “Edison Electric Institute Exam.” Mechanical Aptitude Test. https://mechanicalaptitudetest.org/edison-electric-institute-exam/
  11. “POSS University Courses.” Mometrix University. https://www.mometrix.com/university/poss/
  12. “Plant Operator Selection System Exam.” Exam Sample. https://www.examsample.com/plant-operator-selection-system-exam.html
  13. “EEI POSS Test.” Aptitude Test Prep. https://aptitude-test-prep.com/test-providers/eei/eei-poss-test/
  14. “POSS Test Review.” Test Prep Review. https://www.testprepreview.com/poss-test.htm
  15. “POSS Exam Tips.” YouTube, . https://www.youtube.com/watch?v=OkpEwBXOgnw
  16. “EEI POSS Exam Discussion.” Reddit. https://www.reddit.com/r/nuclear/comments/19dyava/eei_poss_exam/
  17. “Post Exam Reflection Worksheet.” Washington University in St. Louis. https://ctl.wustl.edu/learningcenter/resources/post-exam-reflection-worksheet/
  18. “Exam Wrappers.” Center for Excellence in Learning and Teaching, Iowa State University. https://www.celt.iastate.edu/instructional-strategies/evaluating-teaching/quizzes-exams/exam-wrappers/
  19. “How Can Post-Exam Reviews Become a Powerful Teaching Strategy?” Magna Publications. https://www.magnapubs.com/product/program/how-can-post-exam-reviews-become-a-powerful-teaching-strategy/
  20. “How to Review an Exam.” YouTube, https://www.youtube.com/watch?v=a8KZax4hvfk
  21. “POSS Test 2023 Discussion.” Reddit. https://www.reddit.com/r/nuclear/comments/10rx0a5/poss_test_2023/

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