Practice Test GeeksBOC - Building Operator Certification Practice Test
← All BOC Flashcard Decks

Electrical Systems and Lighting Flashcards

7 cards from real BOC practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 Electrical Systems and Lighting flashcards as text

  1. A 120-volt circuit feeds a resistive heater with a resistance of 10 ohms. How much current does it draw?

    Answer: 12 A

    By Ohm's law, I = V/R = 120 V / 10 Ω = 12 A.

  2. Power factor in a building's electrical system is best defined as the ratio of:

    Answer: Real power (kW) to apparent power (kVA)

    Power factor equals kW divided by kVA and shows how effectively current is converted into useful work.

  3. Commercial utility demand charges are typically based on which measurement?

    Answer: The highest average kW over a short interval (often 15 minutes) during the billing period

    Demand charges bill the peak average kW recorded over a short demand interval, regardless of total energy use.

  4. One footcandle of illuminance is equal to:

    Answer: One lumen per square foot

    A footcandle is the illuminance produced by one lumen evenly spread over one square foot.

  5. A Class A GFCI receptacle is designed to trip when it senses a ground-fault current imbalance of about:

    Answer: 5 mA

    Class A GFCIs trip at roughly 4–6 mA to protect people from shock.

  6. A lamp rated at a correlated color temperature of 2700 K will appear:

    Answer: Warm, with a yellowish-white tone

    Lower Kelvin values such as 2700 K produce warm light similar to incandescent lamps.

  7. Under OSHA lockout/tagout rules, who is normally allowed to remove a personal lockout device?

    Answer: The employee who applied it

    Each lock must be removed by the worker who installed it, except under strict documented emergency removal procedures.

How this page was made: written with AI tools and published by Nathan Beja, founder of Practice Test Geeks, who is responsible for its content. Exam facts are checked against the official sources listed below. Not reviewed by a subject-matter expert. Editorial policy

Sources & references

Exam facts on this page (fees, format, dates, passing scores) are checked against these official sources; the date is our last check. Editorial policy

  1. theboc.info — Late registration, renewal, test delivery, fees, exam format, passing score, registration deadline, retake fee, retake policy, score release · verified Oct 2026