Study Scheduler/PE/Mechanical: Thermal & Fluid Systems
Principles and Practice of Engineering

PE Mechanical: Thermal & Fluid Systems study schedule.

PE Mechanical: Thermal & Fluid Systems follows the NCEES specification effective October 2025: 80 questions across 5 knowledge areas. Thermal/Fluid Principles is the largest at 19–29 questions, with Fluid Equipment and Distribution Systems and Power Systems and Components at 17–26 each, and Cooling/Heating Systems and Components at 12–18.

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Questions

70–107, across 5 topics

Spec version

Effective October 2025

Exam format

8 or 8.5 hours testing; 9 or 9.5 hours for the appointment

Where to put your time first.

Ranked by question count weighted against the spec's own difficulty rating — not question count alone, since a smaller topic rated harder can be worth more study time than a bigger, easier one.

1Thermal/Fluid Principles19–29q

Heat Transfer Principles · Thermodynamic Principles · Fluid Principles

2Power Systems and Components17–26q

Turbines · Boilers, Steam Generators, and Waste Heat Recovery · Condensers · Power Cycles

3Fluid Equipment and Distribution Systems17–26q

Piping Components and Connections · Fluid Distribution Systems · Pumps and Fans · Compressors, Nozzles, and Diffusers

Full Mechanical: Thermal & Fluid Systems topic breakdown.

Every topic in the official NCEES spec, with its question range and share of the exam. Study Scheduler allocates your study hours in this same proportion automatically.

Thermal/Fluid Principles~27% of exam19–29q
  • Heat Transfer Principles
  • Thermodynamic Principles
  • Fluid Principles
Fluid Equipment and Distribution Systems~24% of exam17–26q
  • Piping Components and Connections
  • Fluid Distribution Systems
  • Pumps and Fans
  • Compressors, Nozzles, and Diffusers
Power Systems and Components~24% of exam17–26q
  • Turbines
  • Boilers, Steam Generators, and Waste Heat Recovery
  • Condensers
  • Power Cycles
Cooling/Heating Systems and Components~17% of exam12–18q
  • Heat Exchangers
  • Cooling Towers
  • Refrigeration Cycles and Heat Pumps
Supportive Knowledge (Thermal and Fluid Systems)~7% of exam5–8q
  • Economic Analysis
  • Project Planning and Scheduling
  • Electrical Concepts
  • Material and Stress Analysis
  • Interpretation and Application of Codes and Standards

Frequently asked about Mechanical: Thermal & Fluid Systems.

What’s the biggest topic on PE Thermal & Fluid Systems?

Thermal/Fluid Principles — heat transfer, thermodynamics, and fluid principles — worth 19–29 of the exam’s 80 questions.

How many topics does PE Thermal & Fluid Systems cover?

Five knowledge areas under the October 2025 specification: thermal/fluid principles, fluid equipment and distribution systems, power systems and components, cooling/heating systems and components, and supportive knowledge.

For how many hours to budget, week-by-week study plans, and how Study Scheduler weights your plan — see the full PE study guide.

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