NCEES PE Mechanical · the exam
The PE Mechanical exam
PE Mechanical is three separate depth exams — you sit one to get licensed. This page is the whole picture: what it is, the format all three share, which depth to pick, and how to get ready.
7 days free · no card · cancel anytime.
Choose your depth
You sit one depth. Pick the one that matches your day-to-day engineering work, where your experience does the most for you.
HVAC & Refrigeration
- Who it's for
- Building-mechanical, HVAC, refrigeration
- Pass rate
- ~69–73% first-time — the most-taken depth
- Heavy on
- Equipment & systems; psychrometrics is where it's won or lost
Machine Design & Materials
- Who it's for
- Machine/product design, components, manufacturing, materials
- Pass rate
- ~64–67% first-time — the broadest, most demanding
- Heavy on
- The mechanics-of-materials spine; fatigue
Thermal & Fluid Systems
- Who it's for
- Power, energy, process, fluid systems
- Pass rate
- ~71–75% first-time — the highest, and fastest-growing
- Heavy on
- Power cycles; compressible flow
Still deciding? See which depth to take (the full breakdown — roles, industries, edge cases) and pass rates.
The format every depth shares
- 80 questions over a nine-hour appointment — about 8 hours of testing, plus the tutorial and one optional scheduled break.
- Computer-based and offered year-round at Pearson VUE.
- Closed book — your only reference is the on-screen NCEES PE Mechanical Reference Handbook, so navigating it fast is its own exam skill.
- Standard multiple choice plus alternative item types (drag-and-drop, point-and-click, multiple-correct, fill-in).
- Scored against a scaled cut score — NCEES publishes no fixed passing percentage. At ~6 minutes a question, pacing matters.
- Units vary by depth: HVAC & Refrigeration is U.S. customary; Machine Design & Materials and Thermal & Fluid Systems use both SI and U.S. customary.
More: What to expect on exam day · Registration · Approved calculators · Using the Reference Handbook.
How to pass — the short version
- 1
Pick the depth that matches your work.
- 2
Diagnose first — find your weak areas before you study, not after.
- 3
Go problems-first — drill exam-real problems, not chapters; let your misses set the plan.
- 4
Rehearse closed-book Handbook navigation until finding equations and tables is automatic.
- 5
Finish with timed, full-length mocks to lock in your eight-hour pace.
Plan on ~200–300 hours over about four months, weighted to your weak and heavy areas. The full method →
How CastorPrep helps
Practice
Exam-real problems
Tagged to the NCEES spec, so practice matches the real weighting.
Tutor
Grounded AI tutor
Answers your questions and walks the method — on every problem, with the Handbook section cited.
Mocks
Full-length mocks
Timed, to rehearse your eight-hour pace.
Diagnose
The diagnostic
Maps your weak areas and ranks what to drill first.
7 days free · no card · cancel anytime.
Exam FAQ
How is the PE Mechanical exam structured?
Three separate depth exams — HVAC & Refrigeration, Machine Design & Materials, Thermal & Fluid Systems — and you sit one. Each is 80 questions over a nine-hour appointment (~8 hours of testing), closed book with the on-screen NCEES Reference Handbook, computer-based and offered year-round.
Which depth should I take?
The one that matches your engineering work — you only have to pass one. Compare the three below, or see the full pass-rate breakdown and the depth chooser.
What units does the exam use?
It depends on the depth: HVAC & Refrigeration is U.S. customary (USCS); Machine Design & Materials and Thermal & Fluid Systems use both SI and U.S. customary.
Open book or closed book?
Closed book. Your only reference is the on-screen NCEES PE Mechanical Reference Handbook, so knowing where things live in it is its own exam skill.
What score do I need to pass?
NCEES uses a scaled cut score and doesn't publish a fixed passing percentage. The goal is mastery of the tested areas, not a magic number.
How long should I study?
Most candidates need ~200–300 hours over about four months, weighted to weak and heavy areas.
What if it takes more than one attempt?
It's offered year-round, within NCEES/state-board attempt limits. A retake plan that changes the method — not just the hours — is what moves the score.
Pick your depth and see whether it clicks before you pay a cent.
7 days free · no card · cancel anytime.