Power Engineering · 4th Class, Part A (4A)
4th Class Power Engineering Practice Test: Part A (4A).
Five practice questions from five different units of the SOPEEC 4th Class syllabus, answers included: three calculations and two on how the plant works. Pick an answer, then open the explanation. Every question in the bank explains all four options, not just the right one.
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A 24 mm diameter steel hanger rod supports 45 kN of pipe load in a refinery pipe rack. What is the tensile stress in the rod?
- 24.9 MPa
- 78.1 MPa
- 99.5 MPa
- 398 MPa
Show the answer
C. Correct. A = πd² ÷ 4 = π × 24² ÷ 4 = 452.4 mm². σ = F ÷ A = 45 000 N ÷ 452.4 mm² = 99.5 N/mm² = 99.5 MPa (1 N/mm² = 1 MPa).
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A hospital's hot-water heating system holds 2 500 kg of water, filled cold at 15 °C and heated to its operating temperature of 82 °C. Taking c = 4.19 kJ/kg·K, how much heat does the warm-up take?
- 702 MJ
- 859 MJ
- 1 016 MJ
- 3 562 MJ
Show the answer
A. Correct. Q = m c ΔT = 2 500 kg × 4.19 kJ/kg·K × (82 − 15) K = 2 500 × 4.19 × 67 = 701 825 kJ ≈ 702 MJ. Sensible heat depends on the temperature rise, not on the final temperature.
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Near a boiler's gas train, a portable detector calibrated for methane reads 20 % LEL. Methane's lower explosive limit is 5.0 % by volume in air. What is the methane concentration?
- 0.25 % by volume
- 1.0 % by volume
- 4.0 % by volume
- 20 % by volume
Show the answer
B. Correct. A reading in % LEL is the fraction of the lower explosive limit reached: 0.20 × 5.0 % = 1.0 % methane by volume. Below the LEL the mixture is too lean to burn, but a leak can grow, so the reading still calls for finding the source.
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A tube in a straight-tube watertube boiler with sectional (box) headers must be cleaned and its end re-expanded. How does the crew reach the inside of the tube end?
- By opening the steam drum manhole and working along the drum
- By cutting the tube out and welding in a new length on a sleeve
- Through the capped handhole opposite the tube end
- Through a furnace access door, working on it from the gas side
Show the answer
C. Correct. Each tube end in a sectional header has a handhole directly opposite it, closed by a cap. With the cap off, a cleaner or tube expander passes straight into the tube, which is the point of the design.
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A boiler has sootblowers in the furnace, superheater, generating bank and economizer. When all of them are blown in one cycle, in what order are they normally operated?
- All sections at once, so the soot leaves in one short burst
- Economizer first, then back against the gas flow to the furnace
- The dirtiest section first, whatever its place in the gas path
- Furnace first, then onward with the gas flow to the economizer
Show the answer
D. Correct. Soot and ash knocked loose are carried along by the gas. Starting at the furnace end and working toward the outlet means each section's deposits are swept downstream over surfaces not yet cleaned, instead of onto surfaces already cleaned.
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The 4th Class Power Engineering exam, Part A, at a glance
How many questions are on the 4th Class Power Engineering 4A exam?
The 4th Class Power Engineer certificate exam is two papers, A and B, and each is passed on its own at 65 percent: the marks are not averaged. Paper A (4A) covers the theory, codes, safety and the boiler itself; paper B (4B) covers operating the plant. Paper A is written to the SOPEEC reference syllabus, twelve units and 55 objectives, which Alberta's ABSA publishes word for word as AB-54 (units A1 to A12) and which TSSA in Ontario, where the certificate is called 4th Class Power (Operating) Engineer, adopts unchanged. ABSA, Technical Safety BC (exam 4A1), TSASK and the current TSSA guide all give the same format: 100 multiple-choice questions, three hours and 65 percent to pass. SOPEEC's own sample questions have four options, A to D, and SOPEEC puts the pace at 1.8 minutes a question. Some older documents still say 150 questions and three and a half hours; Technical Safety BC moved to 100 questions on 1 March 2023.
None of SOPEEC, ABSA, Technical Safety BC, TSASK or TSSA publishes how many questions come from each unit. What the syllabus does show is how much of 4A is arithmetic: the mechanics unit, the chemistry and thermodynamics unit (including steam tables), electricity, pressure head in instrumentation, and combustion and draft in boiler systems. The Handbook of Formulae and Physical Constants, steam tables and refrigeration tables are normally provided at the sitting, and code questions are given in both imperial and SI units.
The full 4th Class Power Engineering practice exam
Know your real 4A score before exam day.
550 practice questions for Part A of the 4th Class exam, mapped to all 55 SOPEEC objectives across units A to L, with every calculation worked in the explanation. Timed 100-question mock exams in the exam's three hours, so you can see how you do on a full 100-question paper in the real time limit.
Writing both papers? The 4B practice test covers Part B, and All-Access covers 4A and 4B for $89.
What the 4A paper covers
Twelve units, 55 objectives.
The SOPEEC syllabus splits paper A into twelve units, A to L, and 55 objectives. None of SOPEEC, ABSA, Technical Safety BC, TSASK or TSSA publishes a per-unit question count, so our 550-question bank covers every objective, and the counts below are what is in our bank, not on the exam. Each unit links to five free questions on it.
- A
Elementary Mechanics and Dynamics · 71 in our bank
Basic terms and units, forces and moments, equilibrium, simple machines (mechanical advantage, velocity ratio, efficiency), vectors, speed, velocity and acceleration, work, power, energy and gauge versus absolute pressure, friction, stress, strain and factor of safety, and belt and gear drives. Nearly all calculation. Free unit A questions: mechanics and dynamics →
- B
Elementary Chemistry and Thermodynamics · 52 in our bank
Basic chemistry and simple combustion reactions, the laws of thermodynamics, sensible heat and expansion, conduction, convection and radiation in heat exchangers, and the properties of steam read from steam tables, including dryness fraction. Free unit B questions: chemistry, thermodynamics and steam →
- C
Jurisdictional Legislation, Codes and Standards for Power Engineers · 20 in our bank
What the provincial acts and regulations for boilers, pressure vessels and piping are for, and the purpose of the codes and standards a power engineer works to, including CSA B51, CSA B52 and the ASME Boiler and Pressure Vessel Code. Free unit C questions: legislation, codes and standards →
- D
Power Plant/Heating Plant Safety · 50 in our bank
General plant safety, safety programs such as lockout and confined-space entry, storing and handling dangerous materials, fire safety in a plant, and the causes, prevention and extinguishing of fires. Free unit D questions: plant safety and fire protection →
- E
Environment · 30 in our bank
How an operating plant affects the environment, and how gas and noise emissions and liquid and solid wastes are controlled. Free unit E questions: environment and plant emissions →
- F
Material and Welding · 34 in our bank
Mechanical properties of engineering materials and what alloying elements change, the welding processes used in plants, and how welds and materials are inspected and tested. Free unit F questions: materials, welding and weld inspection →
- G
Piping and Valves · 29 in our bank
Pipe types, connections, supports, expansion and drainage devices including steam traps, and the designs and uses of the valves found in plants and on boilers. Free unit G questions: piping, valves and steam traps →
- H
Electricity · 51 in our bank
Ohm's law and series and parallel circuits, magnetism, electrical meters, AC and DC motors and generators, transformers, and electrical distribution and its safe operation. Free unit H questions: electricity, motors and transformers →
- I
Energy Plant Instrumentation and Controls · 57 in our bank
What plant instruments and controls do, measuring pressure, level, flow, temperature, humidity and composition, transmitters, controllers and actuators, boiler programming controls and their testing, and electronic and electrical control systems. Free unit I questions: instrumentation and controls →
- J
Plant Communication · 19 in our bank
Plant and equipment sketches and line tracing, the common types of plant diagrams, and plant communication systems. Free unit J questions: plant drawings and communication →
- K
Boilers · 68 in our bank
How boilers developed, firetube and watertube designs and their components, electric boilers, boilers designed for heating plants, and the differences between ASME Section I and Section IV boilers. Free unit K questions: firetube, watertube and heating boilers →
- L
Boiler Systems · 69 in our bank
Combustion theory and excess air, fuel systems, draft and combustion-air equipment, feedwater systems, blowdown, and fireside cleaning such as sootblowers. Free unit L questions: combustion, draft, feedwater and blowdown →
Where our questions come from
Every question, anchored to the syllabus.
Every question in our 4A bank is written to one objective of the SOPEEC 4th Class reference syllabus and checked in a separate, blind verification pass in which every number is recomputed: stresses, heat quantities, steam-table values, electrical values and combustion air. Steam-table questions either give the property values in the question or space their answer choices far enough apart that small differences between printed table editions cannot change the answer. Legislation differs by province, so questions on acts and regulations either stick to what every jurisdiction shares or name the province in the question. Nothing is copied from textbooks, including the free open learning units, from CSA or ASME code text, or from recalled exam questions. For format by province, what each unit covers and what you can bring into the room, read the 4th Class Power Engineering exam guide (4A). Read how our questions are made.
Last reviewed against the SOPEEC syllabus and the ABSA, Technical Safety BC, TSASK and TSSA exam information.
Why practice scores mislead
You can know the terms and still miss the 4A calculations.
Knowing what a dryness fraction is does not give you the enthalpy of wet steam until you read the tables and work it out. Knowing that stress is force over area does not catch a diameter used where the area belongs. Knowing what % LEL means does not tell you the gas concentration until you multiply it through. A large part of the 4A syllabus is arithmetic like this, done against the clock with the handbook and tables normally provided at the sitting. Our explanations show every step, and our mock exams put 100 questions in front of you in three hours, so you find out whether you can do the working in time, not just whether you recognise the words.
How TicketPrep prepares you
Built like a study tool, not a quiz app.
All 55 objectives
Every objective of the SOPEEC 4A syllabus has questions, across all twelve units, with Standard and Advanced levels.
Every answer explained
Why the right answer is right, and why each of the other three is wrong, with the calculation worked step by step.
Timed mock exams
100 questions drawn from all twelve units in a three-hour timer, the format ABSA, Technical Safety BC, TSASK and TSSA give for 4A.
Know your weak units
Your score broken out by unit, A to L, against the 65 percent pass mark, so you know which unit to drill next.
4th Class Power Engineering exam questions
Before you start.
How many questions are on the 4th Class Power Engineering exam, Part A?
What can you bring into the 4th Class exam?
Is the 4A practice exam free?
Is the 4A exam the same in every province?
What is the difference between 4A and 4B?
Are these real 4th Class exam questions?
How is TicketPrep different from other 4th Class question banks?
Find out where you actually stand.
Five free questions, no account needed. See how you did as you go, then enter your email to unlock every explanation. About five minutes.
Then Exam Pass is $69 one-time for 120 days of access — not a subscription — with a 7-day money-back guarantee. Don't pass? You get 120 more days free. Writing both papers? All-Access covers 4A and 4B for $89.
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