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Electrical Safety

CBT 38 questions

First 5 of 38 questions — with answers

The correct answer is marked. Unlock the rest to study the whole test, online or offline.

  1. Question 1

    At voltages of less than 1 000 V, what is the generally accepted minimum value of insulation resistance for electrical equipment on board ships?
    • One thousand ohms (1 kΩ).
    • One megohm (1 MΩ).
    • One hundred megohms (100 MΩ).
    • One hundred kilohms (100 kΩ).

  2. Question 2

    For a ship's electrical system, which one of the following statements best describes the meaning of the term "earth"?
    • The steelwork of the hull, whose electrical potential can be regarded as zero.
    • Any electrical conductor not on the live side of the supply.
    • An electrical connection only used in dry-dock.
    • Any part of the electrical system insulated from live conductors.

  3. Question 3

    If a fluorescent tube or energy saving light bulb breaks, in addition to ensuring good ventilation, which one of the following statements best describes how the pieces should be cleaned up?
    • Use rubber gloves, sticky tape or wet towels to clean the area, place all materials in a marked sealed container for disposal ashore.
    • Sweep the pieces up with a brush and place all materials in a marked sealed container for disposal ashore.
    • Collect the pieces using rubber gloves, wet towels or sticky tape, grind all materials to less than 25 mm and then they can be thrown overboard once more than 25 miles from land.
    • Call in a specialist firm to clean up and dispose of the waste.

  4. Question 4

    If any part of a live electrical circuit is brought into accidental contact with earth, then which one of the following statements should we assume to be correct?
    • All circuit are protected against any damage occurring.
    • Nothing will ever happen if the ship has an insulated neutral.
    • It is an unsafe situation.
    • Nothing will ever happen if the ship has an earthed neutral.

  5. Question 5

    If unsure whether electrical equipment is live or not, the best course of action to take is to:
    • Treat it as though it were live until a competent person has proved it dead.
    • Wear gloves and apply a short across the terminals to see if there is any sparking.
    • Connect an ammeter between any two terminals.
    • Assume it must be dead if it looks as though it has been disconnected.

Preview — 5 of 38 questions

You are seeing the first 5 questions with answers. Unlock the remaining 33 to study the whole test — online or offline.

About this CBT test

Electrical Safety is a CBT test with 38 questions and verified answers. Common topics include: electrical equipment, insulation resistance, electric shock, hazardous area, work, live, circuit, current.

You can practise the free questions online — one at a time, with the correct answer — or unlock the whole test and download it to study offline, without internet.

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