Free 5th Class Power Engineer’s Certificate of Competency examination Practice Questions

Sample Practice Questions

Try these 10 sample questions from the 5th Class Power Engineer’s Certificate of Competency examination practice bank. Each includes the answer and explanation. Continue with the interactive practice above to review the full question set.

1. 1At an Alberta heating plant, an operator records a burner safety test in the electronic log. Which time must the entry show under ABSA's electronic-log requirements?

   1. A.The time the electronic log entry is madeCorrect answer: A
   2. B.The time the operator's current shift begins
   3. C.The time the next shift takes over the plant
   4. D.The time the last log entry was countersigned

   Explanation: ABSA requires: "time and the date" The test record must therefore carry its entry time; shift-start, handover and countersigning times do not substitute for it.

   Reference: ABSA Information Bulletin IB23-025: Electronic Log Book — p. 1, Requirements for an Electronic Log

2. 2An operator must cover a rectangular access panel measuring 1.2 m by 800 mm with insulation. Ignoring cutting waste, what panel area is required?

   1. A.960 m²
   2. B.0.096 m²
   3. C.9.60 m²
   4. D.0.960 m²Correct answer: D

   Explanation: The source states: "Area of rectangle: length × width" Convert 800 mm to 0.800 m, then area = 1.2 × 0.800 = 0.960 m². 0.096 and 9.60 result from dividing millimetres by 10000 or 100; 960 omits conversion entirely.

   Reference: NIST Circumference, Area and Volume — Basic formulas

3. 3An energized pump motor is burning. Which fire classification applies while the motor remains electrically live?

   1. A.Class CCorrect answer: A
   2. B.Class D
   3. C.Class A
   4. D.Class B

   Explanation: The guidance states: "Fires involving energized (live) electrical equipment" Energized electrical equipment is Class C. A concerns ordinary combustibles, B flammable fluids and gases, D combustible metals.

   Reference: CCOHS Portable Fire Extinguishers — What are the different classes of fires?

4. 4A circulating pump guides water to the eye of a rotating impeller and then collects it in an expanding volute. What type of pump is described?

   1. A.Reciprocating piston pump
   2. B.Gear pump
   3. C.Diaphragm pump
   4. D.Centrifugal pumpCorrect answer: D

   Explanation: The source states: "The pump casing guides the liquid from the suction connection to the center, or eye, of the impeller." The impeller-eye and volute arrangement identifies a centrifugal pump. The other choices move trapped volumes by gears, diaphragm displacement or a piston.

   Reference: DOE Mechanical Science Volume 1 — ME-03 p. 1, Centrifugal Pumps

5. 5A steam-heating boiler's pressure continues rising despite its operating control. Which fitting is intended to relieve pressure automatically to protect against exceeding MAWP?

   1. A.Steam flowmeter
   2. B.Safety valveCorrect answer: B
   3. C.Water column
   4. D.Feedwater regulator

   Explanation: The source states: "The safety valve is the most important valve on the boiler and keeps the boiler from exceeding its maximum allowable working pressure (MAWP)." The safety valve is the pressure-relieving protective fitting. Feed regulation, flow measurement and water-level indication do not provide that automatic pressure relief.

   Reference: DOE Improving Steam System Performance — p. 7, Safety valve

6. 6During a combustion check, an operator compares actual combustion air with the theoretical amount needed for complete combustion. What is air above that theoretical amount called?

   1. A.Primary air
   2. B.Secondary air
   3. C.Excess airCorrect answer: C
   4. D.Recirculated gas

   Explanation: The source states: "Excess air in a combustion process is that amount of air present in excess of the theoretically required air for complete combustion." Excess air is defined relative to the complete-combustion requirement. Primary and secondary identify introduction stages; recirculated gas is a different stream.

   Reference: DOE Improving Steam System Performance — Appendix A p. 53, Excess air

7. 7An operator preparing a hot-water boiler startup finds that an equipment-specific manufacturer instruction differs from a general ABSA AB-602 guideline. Which instruction takes precedence?

   1. A.The manufacturer's equipment instructionCorrect answer: A
   2. B.The generic heating-plant guideline
   3. C.The previous shift's operating note
   4. D.The training course's worked example

   Explanation: The source states: "take precedence" The equipment manufacturer's instructions control this stated conflict. Shift notes and course examples do not override them, and the generic guideline explicitly yields.

   Reference: ABSA AB-602 Heating Plant Guidelines — p. 1, opening instructions

8. 8An operator checks an A1 refrigerant's ASHRAE safety designation. Which interpretation applies?

   1. A.Higher toxicity and no flame propagation under the classification test
   2. B.Lower toxicity and lower flammability under the classification test
   3. C.Higher toxicity and higher flammability under the classification test
   4. D.Lower toxicity and no flame propagation under the classification testCorrect answer: D

   Explanation: ASHRAE describes Class A with an "exposure limit (OEL) of 400 ppm or greater" and Class 1 as "No flame propagation". A1 therefore combines the lower-toxicity class with no flame propagation under the classification test, rather than either higher toxicity or a flammable class. It does not guarantee harmlessness.

   Reference: ASHRAE Fundamentals: Refrigerants — 3, Safety

9. 9Which control is intended to stop a refrigeration compressor when discharge pressure becomes excessive?

   1. A.Low-pressure cycling switch
   2. B.Lubricant differential switch
   3. C.Motor thermal overload
   4. D.High-pressure cutoutCorrect answer: D

   Explanation: The source states: "High-pressure cutout" The table assigns excessive-pressure shutdown to the high-pressure cutout. The other devices respond to evaporator pressure, inadequate oil-pressure differential, and motor heating respectively.

   Reference: ASHRAE Refrigeration: Refrigerant Control Devices — Table 1, High-pressure cutout

10. 10An emergency diesel generator takes on more electrical load. Which device adjusts engine fueling to maintain the selected operating speed?

    1. A.The voltage regulator
    2. B.The engine governorCorrect answer: B
    3. C.The overspeed trip
    4. D.The starting solenoid

    Explanation: The source states: "A governor is essentially a speed-sensitive device, designed to maintain a constant engine speed regardless of load variation." The governor adjusts fuel as load changes. A voltage regulator controls generator voltage through excitation, an overspeed trip is protective shutdown, and a starting solenoid operates the starting circuit.

    Reference: DOE Mechanical Science, Volume 1 — ME-01, p. 34, Governor