NCT Study Guide 2026
Everything you need to pass the NCT exam in one place: the exam format, every topic to study, real practice questions with explanations, flashcards, and full-length practice tests. Free, no sign-up needed.
📋 NCT Exam Format at a Glance
📚 NCT Topics to Study (63)
✍️ Sample NCT Questions & Answers
1. Which provision of the Clean Air Act requires states to develop State Implementation Plans (SIPs) that directly affect stationary source emission limits and filtration requirements?
Title I Part D requires states in non-attainment areas to develop SIPs with emission reduction strategies, imposing stricter controls on stationary sources including filtration systems.
2. A fleet risk assessment reveals high telematics-recorded harsh-braking events concentrated on a specific route segment. The MOST targeted mitigation is to:
Concentrated harsh-braking at a route segment suggests a road condition or design issue that should be identified and corrected at the source.
3. Which of the following refrigerants is classified as A2L (mildly flammable) and is a primary component in next-generation low-GWP systems?
R-32 is an A2L mildly flammable refrigerant with a GWP of 675 and is a key component in low-GWP systems like R-454B, replacing R-410A in new equipment.
4. Under the Kigali Amendment to the Montreal Protocol, which class of substances is being phased down globally?
The Kigali Amendment, adopted in 2016, established a global phasedown schedule for HFCs due to their high global warming potential.
5. NFPA 90A covers the installation of air-conditioning and ventilating systems. What is the primary fire safety function of a listed combination fire/smoke damper in a duct system?
Combination fire/smoke dampers close automatically to block both the passage of flames and smoke through rated fire-resistance assemblies penetrated by ductwork.
6. Under OSHA's Hazard Communication Standard (HazCom / 29 CFR 1910.1200), what information must a technician review before changing filters in a system handling a regulated chemical process?
HazCom requires workers to consult SDS for any hazardous chemicals they may be exposed to, including residues on spent filters from chemical processes.