Stationary engineer and boiler operator

About this practice suite

This suite prepares candidates for stationary engineer and boiler operator selection in the skilled trades and apprenticeships sector with 5 skill areas: mechanical comprehension, technical reasoning, safety judgment, numerical reasoning and electrical reasoning. Every question was written by Novus editors for this suite — none are taken from live or leaked exams — and the full bank holds 52 scored questions across three modes, plus 8 reserve questions used to vary repeat attempts. Answer keys never ship to the browser: your answers are scored server-side, and results stay on your device.

Skills this suite practises

• Mechanical comprehension — Forces, motion, gears, pulleys, levers, fluids, pressure, and basic machines.
• Technical reasoning — Applied technical principles, diagrams, tools, systems, measurements, and troubleshooting.
• Safety judgment — Hazard recognition, safe sequencing, escalation, and risk controls.
• Numerical reasoning — Arithmetic, fractions, percentages, ratios, rates, estimation, word problems, and number relationships.
• Electrical reasoning — Basic circuits, current, voltage, resistance, symbols, and electrical troubleshooting.

Sample questions from the guided bank

Two of the 10 guided-practice questions, shown exactly as they appear in a session. Answers and explanations are not printed here — keys stay on the server — so open guided practice to answer them and see how you did.

1. A stationary engineer and boiler operator primarily:

   • A. Sells residential real estate
   • B. Designs fashion collections
   • C. Pilots commercial aircraft
   • D. Operates and maintains boilers, auxiliaries, and building/plant utility systems

2. Low-water alarm sounds on a steaming boiler. What is best?

   • A. Follow emergency low-water procedure; do not continue firing blindly
   • B. Increase firing rate immediately
   • C. Disable the alarm and walk away
   • D. Add any chemical without checking level

Practice modes and timing

Guided practice is untimed-feeling and instructional; the mini-test is a short timed check; the full simulation mirrors a complete sitting. All three draw on separate question sets, so moving up a mode never repeats what you practised.

Study outline

Read the study outline for this suite’s skills, timings, and recommended lessons on one printable page, or download its standalone HTML file. The printable page can also be saved as a PDF from your browser.