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Quizzes > Science > Other Sciences

Stationary Engineer Certification Practice Quiz - Test Your Skills

Think you can ace the engineer practice? Dive into our stationary engineer practice test now!

Editorial: Review CompletedCreated By: First LastnameUpdated Aug 28, 2025
Difficulty: Moderate
2-5mins
Learning OutcomesCheat Sheet
Paper art illustration for online Stationary Engineer Certification practice quiz on teal background

This Stationary Engineer Certification practice quiz helps you review boiler controls, safety, and system diagnostics so you can spot gaps before the exam. Work through sample exam questions , try a practice test , and get instant feedback with brief, clear explanations.

Which code sets the design and construction requirements for power boilers used in stationary plants?
NFPA 70 National Electrical Code
ASHRAE Standard 90.1
API 650
ASME Boiler and Pressure Vessel Code Section I
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The device that automatically admits feedwater to a boiler to maintain proper water level is called a
steam trap
float-operated feedwater regulator
superheater
economizer
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In steam systems, the component that removes air and non-condensable gases from feedwater is the
desuperheater
deaerator
condenser hotwell
separator
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Which instrument is used to verify insulation resistance of motor windings before startup?
Manometer
Megohmmeter (megger)
Tachometer
Clamp-on ammeter
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What is the primary function of a steam trap?
Reduce steam pressure to the process
Measure steam flow rate
Discharge condensate while preventing live steam loss
Increase steam superheat
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A boiler with MAWP of 150 psig typically has its safety valve set pressure at
150 psig
135 psig
90 psig
165 psig
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Which code governs inspection and repair of in-service pressure vessels and boilers?
NBIC (National Board Inspection Code)
ASME B31.1
API 570
NFPA 54
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The best location for a boiler drum water level gauge glass is
On the feedwater header downstream of the economizer
On the superheater outlet header
On the blowdown line near the flash tank
Directly connected to the steam and water spaces of the drum
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When starting a cold boiler on fuel oil, the atomizing medium is commonly
exhaust gas recirculation
compressed nitrogen only
steam or compressed air
cold feedwater
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Which steam trap type operates primarily on the difference in density between steam and condensate to actuate an inverted bucket mechanism?
Thermodynamic disc trap
Inverted bucket trap
Bimetallic trap
Float and thermostatic trap
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Which combustion control strategy maintains a fixed relationship between fuel and air with trim based on O2 feedback?
Jackshaft only control without feedback
On-off control
Single-point positioning
Parallel positioning with oxygen trim
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A 3-phase, 460 V motor draws 52 A at 0.86 power factor and 92 percent efficiency. Approximate output horsepower is
about 50 hp
about 40 hp
about 20 hp
about 30 hp
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What is the primary purpose of a desuperheater installed between a boiler and process user?
Remove dissolved gases from condensate
Reduce steam temperature to near saturation for process control
Increase steam dryness fraction
Raise steam pressure to compensate for line losses
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A boiler operates at 150 psig saturated. The approximate saturation temperature is
about 366 F (186 C)
about 450 F (232 C)
about 212 F (100 C)
about 338 F (170 C)
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Which interlock must prove prior to burner ignition on most packaged boilers?
Economizer outlet temperature high
High stack temperature alarm
Combustion air flow (air switch proven)
Low water alarm acknowledged
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An induced draft fan speed increase (with fuel constant) will most likely
raise furnace pressure and decrease excess air
lower furnace pressure and increase excess air
trip the boiler on high water
increase steam temperature
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At 10,000 ft elevation, the approximate atmospheric pressure is 10.1 psia. What is the saturation temperature of water at this pressure?
about 250 F (121 C)
about 150 F (66 C)
about 193 F (89 C)
about 212 F (100 C)
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A boiler firing natural gas shows 7 percent O2 dry in flue gas with 50 ppm CO. The most effective immediate tuning change is to
lower fuel pressure drastically
increase excess air significantly to 12 percent O2
bypass the economizer
reduce excess air slightly to lower O2 while monitoring CO
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Which condition will most increase risk of caustic embrittlement in boiler drums?
High concentration of NaOH under porous scale with stress
Low pH and low alkalinity
High silica in feedwater only
High oxygen scavenger residual
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A 200 hp boiler (1 boiler hp = 33,475 Btu/hr) with 80 percent efficiency requires approximately what natural gas input (HHV 1,020 Btu/scf)?
about 10,400 scfh
about 4,100 scfh
about 8,200 scfh
about 6,600 scfh
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Study Outcomes

  1. Understand Stationary Engineer Certification Online Exam Structure -

    Summarize the format and question types encountered in the stationary engineer certification online exam to anticipate real test conditions.

  2. Apply Core Stationary Engineering Principles -

    Use fundamental stationary engineering concepts - such as thermodynamics and system controls - to solve theoretical and practical problems effectively.

  3. Identify Troubleshooting Techniques in Stationary Engineer Practice Test Scenarios -

    Recognize and select diagnostic steps and troubleshooting methods for common system malfunctions featured in stationary engineer practice quizzes.

  4. Analyze Stationary Engineer Exam Questions Strategically -

    Break down stationary engineer exam questions to identify patterns, eliminate distractors, and improve answering strategies.

  5. Evaluate Your Performance on Stationary Engineer Practice Exams -

    Assess your strengths and weaknesses in mock stationary engineer practice exams to focus study efforts and boost exam confidence.

  6. Recall Key Safety Protocols for Stationary Engineer Operations -

    Reinforce critical safety and regulatory guidelines that govern stationary engineer operations, ensuring compliance and best practices.

Cheat Sheet

  1. Thermodynamics Principles and Steam Properties -

    Mastering enthalpy (h = u + Pv) and steam tables is essential for stationary engineer certification online success. Use ASME steam tables to identify specific volume, quality and saturation temperature for accurate boiler operation. Consult MIT OpenCourseWare modules for practical exercises on phase-change calculations.

  2. Boiler Safety Controls and Relief Systems -

    Review NFPA 85 standards on low-water cutoffs, pressure relief valves and flame safeguards to ensure compliance and safety under exam conditions. Study setpoints and test intervals from official manufacturer manuals and the U.S. Department of Energy boiler operation guide. Remember the acronym "POW" (Pressure relief, Operational interlock, Water level control) as a pre-startup checklist.

  3. Heat Transfer Mechanisms and Efficiency Calculations -

    Differentiate conduction, convection and radiation to evaluate boiler heat transfer using Q = U·A·ΔT (U = overall heat-transfer coefficient) from MIT OpenCourseWare resources. Practice efficiency computations by dividing heat output by heat input and multiplying by 100. Keep the formula "Eout/Ein × 100" top-of-mind during stationary engineer practice tests.

  4. Pumps, Turbines, and NPSH Principles -

    Certification exam questions often cover pump curves, cavitation and Net Positive Suction Head (NPSH); calculate NPSH = (Patm/ϝg + V²/2g) - Pvapor for safe operation. Reference the ASME Pump Handbook and Journal of Hydraulic Engineering for authoritative formulas. Use the mnemonic "PaVe" (Atmospheric, Velocity head, vapor pressure) to verify NPSH elements.

  5. Maintenance Protocols and Troubleshooting Techniques -

    Study root cause analysis tools like the "5 Whys" and fishbone diagrams from the International Journal of Engineering Research to resolve boiler faults efficiently. Simulate real-world scenarios on stationary engineer certification online practice exam platforms to refine diagnostic skills. Adopt the four-step mantra "Code, Check, Correct, Confirm" when addressing error codes under exam pressure.

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