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High Voltage, Equipment and Testing

CBT 50 questions

First 5 of 50 questions — with answers

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

  1. Question 1

    A fault within a high voltage starter panel could lead to an explosion. Which of the following is the sort of fault that could cause an explosion? Tick all that apply:
    • A loose terminal.
    • Excessive dirt or moisture.
    • Excessive heat.
    • A circuit breaker that opened under fault conditions but did not contain the arc.
    • Inadequate earthing of the cubicle.
    • Cables bent into too tight a radius.

  2. Question 2

    After maintenance of high voltage equipment has been completed the person carrying out the work is often asked to sign the Permit to Work before the permit is cancelled. Which one of the following best describes what the person is signing for?
    • To confirm that he knows the permit is cancelled.
    • That all tools, test equipment and any additional earths have been removed.
    • To record the time at which he surrendered the permit.
    • So that the signatures can be compared before and after permit issue.

  3. Question 3

    High voltage switchgear is often provided with busbar shutters. Which one of the following best describes why these are fitted?
    • The shutters can be locked to protect against touching the high voltage busbars.
    • The shutters can be locked open to enable visual examination of the busbar condition.
    • The shutters operate an external indicator which shows whether the breaker is "racked in" or "racked out".
    • The shutters help keep dirt off the busbar contacts.

  4. Question 4

    If isolation is not thorough, which of the following is the most dangerous stage in making a piece of high voltage electrical equipment safe to work on, according to this module?
    • Disconnection.
    • Reconnection.
    • Earthing.
    • Deeding.

  5. Question 5

    Insulation readings for high voltage equipment are sometimes used to calculate a polarisation index. Which one of the following is the value of polarisation index which is normally considered to be the lowest acceptable before investigation of the condition of the insulation is recommended?
    • 2.
    • 4.
    • 5.
    • 1.

Preview — 5 of 50 questions

You are seeing the first 5 questions with answers. Unlock the remaining 45 to study the whole test — online or offline.

About this CBT test

High Voltage, Equipment and Testing is a CBT test with 50 questions and verified answers. Common topics include: high voltage, permit work, electrical systems, polarisation index, insulation readings, hi-pot tester, equipment, out.

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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