SOPEEC 3B2 Exam Guide: Prime Movers, Cogeneration, Compressors, Refrigeration, Special Industrial Equipment, Plant Maintenance and Administration

3B2 is the rotating equipment and systems paper. It brings together prime movers, cogeneration, compressors, refrigeration, heat transfer equipment, fired heaters, wastewater treatment, and plant administration.

What this paper covers

Prime movers include steam turbines, gas turbines, and internal combustion engines, with operating principles, support systems, controls, and startup and shutdown procedures. Cogeneration asks about combined cycle and heat recovery arrangements. Compressors cover compression theory, reciprocating and rotary machines, dynamic compressors, surge, auxiliaries, and compressed-air system components.

Refrigeration covers refrigerants, compression systems, absorption systems, controls, safety devices, leak testing, charging, purging, troubleshooting, and brine systems. The last blocks cover heat exchangers, cooling towers, fired heaters, wastewater treatment, and plant maintenance and administration. It is a broad paper, but it is still rooted in plant hardware and operations.

• Rotating equipment dominates the paper.
• Refrigeration and compression need careful term control.
• Maintenance and administration still show up at the end.

Exam format facts

Like every 3rd Class paper, 3B2 is 100 multiple-choice questions in 3 hours, with 65% needed to pass. The pacing target is simple: keep answers moving, flag hard items, and return only if time remains.

• 100 MCQ
• 3 hours
• 65% pass mark

What trips people up

Candidates often blur together the equipment families. A compressor question is not a refrigeration question, and a turbine support system is not a control-system question. The paper rewards clean separation of concepts. Surge, condenser behaviour, refrigeration controls, and heat exchanger types are all easy places to lose marks if your mental labels are loose.

Another common miss is operational sequence. These questions ask what happens first, what is monitored, and what must be protected. If you have only read the topic once, the sequence will feel obvious until the options are very close together.

• Keep turbines, compressors, and refrigeration distinct.
• Memorize startup and shutdown sequences.
• Use the options to test precision, not guesses.

How to study it

Use equipment-first study blocks. Learn steam turbines, then gas turbines, then internal combustion engines, then compressors, then refrigeration, then the plant support topics. That order helps because it goes from familiar mechanical motion to more abstract systems. Draw simple flow diagrams as you study, even if you do it on paper at the kitchen table.

Once the major machines are stable, move into timed mixed practice. This paper benefits from repetition because the wording is often simple while the decisions behind it are not. Short, frequent review beats one long weekend of cramming.

• Study each machine family on its own first.
• Sketch flow paths and support systems.
• Shift to mixed timed practice near the end.

How SteamTicket covers it

The 3rd Class Part B course has 808 questions across 3B1 and 3B2, and the 3rd Class bundle gives you both banks together at 1,599 questions. SteamTicket keeps the syllabus chapter-scoped, uses SMART Quiz for weak spots, and includes timed mocks plus worked explanations. That is meant to reduce guesswork and make review faster.

You can start with the free 3B sample. If you want to compare the offer, pricing spells out the one-time lifetime access model, and the web app works offline with an iOS app available too.

• 808 questions across 3B1 + 3B2.
• 1,599 questions in the 3rd Class bundle.
• Offline web app and iOS app available.

Common questions