Electrical Safety Rules Test (Part 3 Of 4)-electrical Person

17 Questions | Total Attempts: 1905

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Electrical Safety Rules Test (Part 3 Of 4)-electrical Person

Electricity is used all around us in our homes, offices, and streets. As we continue in our revision on electrical safety, I have prepared the third test in a set of 4 designed to help you adequately prepare for the electrical safety exam. Why don’t you give it a try and see just how much you need? All the best!


Questions and Answers
  • 1. 
    One of the below areas is not a hazardous area:
    • A. 

      Areas close to cargo tanks and piping.

    • B. 

      Areas close to cargo tank and piping relief valves and vents.

    • C. 

      Battery and paint locker

    • D. 

      Motor room with supply fans located outside of the dangerous zones.

  • 2. 
    Electrical equipment could ignite a flammable atmosphere in several ways.
    • A. 

      Sparks from opening and closing contacts

    • B. 

      High surface temperature

    • C. 

      Loose connections

    • D. 

      All the answers are correct.

  • 3. 
    The selection of what equipment can go in a Hazardous area is determined by:
    • A. 

      The Hazardous area plan,

    • B. 

      The equipment protection type

    • C. 

      The ignition temperature of the flammable atmospheres that may occur

    • D. 

      All the answers are correct.

  • 4. 
    Ex d  is the type of protection designed to:
    • A. 

      Prevent ignition from arising

    • B. 

      Prevent ignition from spreading outside enclosure

    • C. 

      Limit ignition energy

    • D. 

      Prevent the atmosphere entering the enclosure

  • 5. 
    Zone 0, is a Hazardous area:
    • A. 

      An area in which an explosive gas/air mixture is likely to occur in normal operation.

    • B. 

      In which an explosive gas/air mixture is continuously present, or present for long periods.

    • C. 

      An area in which an explosive gas/air mixture is not likely to occur in normal operation and, if it occur ,it will exit for only a short time.

  • 6. 
      Battery spaces may be defined as:-
    • A. 

      Not hazardous area

    • B. 

      Hazardous area

    • C. 

      Hazardous area depending upon battery type, capacity and charging arrangement.

  • 7. 
    What is meant by being intrinsically safe?
    • A. 

      Electric wiring executed by approved manufacture?

    • B. 

      Any electrical product, being water resistant?

    • C. 

      Product having a special wiring system?

    • D. 

      Cannot produce enough energy to ignite a gas (explode)?

  • 8. 
    Some equipment may be marked with the following symbol: EX i what does that mean?
    • A. 

      Intrinsically safe.

    • B. 

      Explosion proof.

    • C. 

      Internally explosion proof.

    • D. 

      Not safe in gas dangerous area.

  • 9. 
    In installations of INTRINSICALLY SAFE equipment it is required that all equipment should be separated from non-intrinsically safe equipment, and to be of a special colour. What colour is that?
    • A. 

      Red

    • B. 

      Orange

    • C. 

      Blue

    • D. 

      Green/Yellow

  • 10. 
    Flanges of some pipe work are bonded because:
    • A. 

      These can become electrostatically charged by movement of the fluids within them

    • B. 

      There can be a potential risk of a spark discharge and ignition of any gas present outside

    • C. 

      Earthling the vessel prevents the build-up of such charges.

    • D. 

      A,B & D

  • 11. 
    The equipments that maintain a small internal overpressure (of the order of 0.5 mbar minimum) which prevents the entry of a gas/air explosive mixture or flammable substance are known as:
    • A. 

      Ex-d

    • B. 

      EX-i

    • C. 

      EX-p

  • 12. 
    The minimum temperature required to cause self-sustained combustion without a flame in any material is the  
    • A. 

      Flash point

    • B. 

      Fire point

    • C. 

      Ignition temperature

    • D. 

      All answers are wrong

  • 13. 
    The three elements necessary for a fire or explosion hazard to exist.
    • A. 

      Earth, Wind and Fire

    • B. 

      Fuel, Source of ignition, Oxygen (air)

    • C. 

      Gasoline, Cigarette lighter, Fumes

    • D. 

      Vapors, Source of ignition, nitrogen

  • 14. 
    Which of the following does not describe a confined space?
    • A. 

      Limited access

    • B. 

      Limited natural ventilation

    • C. 

      Limited working space

    • D. 

      An area designed for human occupancy

  • 15. 
    Which one of the following is the major secondary parameter for equipment in Hazardous   atmospheres:
    • A. 

      Gas grouping

    • B. 

      Surface temperature

    • C. 

      Protection against ingress of solid bodies and liquid (IP)

  • 16. 
    HIMAP is -------- measuring and portection device.
  • 17. 
    Material which permits the flow of ------ are referred to as conductors
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