Electrical Safety Rules Quiz

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  • 1/17 Questions

    Electrical equipment could ignite a flammable atmosphere in several ways.

    • Sparks from opening and closing contacts
    • High surface temperature
    • Loose connections
    • All the answers are correct.
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About This Quiz

Electricity is used all around us in our homes, offices, and streets. This ' Electrical Safety Rules Quiz' is prepared to jog your memory on the concepts of electrical safety. We have this specially 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? You can also take this quiz with your friends for excellent preparation. All the very best and study hard!

Electrical Safety Rules Quiz - Quiz

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  • 2. 

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

    • Earth, Wind and Fire

    • Fuel, Source of ignition, Oxygen (air)

    • Gasoline, Cigarette lighter, Fumes

    • Vapors, Source of ignition, nitrogen

    Correct Answer
    A. Fuel, Source of ignition, Oxygen (air)
    Explanation
    The three elements necessary for a fire or explosion hazard to exist are fuel, a source of ignition, and oxygen (air). Fuel provides the material that can burn, the source of ignition provides the heat or spark to start the fire, and oxygen (air) is required to sustain the combustion process. Without any one of these elements, a fire or explosion cannot occur.

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  • 3. 

    The selection of what equipment can go in a Hazardous area is determined by:

    • The Hazardous area plan,

    • The equipment protection type

    • The ignition temperature of the flammable atmospheres that may occur

    • All the answers are correct.

    Correct Answer
    A. All the answers are correct.
    Explanation
    The selection of equipment that can be used in a Hazardous area is determined by several factors. The Hazardous area plan outlines the specific requirements and safety measures that need to be followed in that area. The equipment protection type refers to the level of protection provided by the equipment against potential ignition sources. The ignition temperature of the flammable atmospheres that may occur is also considered to ensure that the equipment can safely operate within the specified temperature range. All of these factors are important in determining the suitability of equipment for use in a Hazardous area.

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  • 4. 

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

    • Intrinsically safe.

    • Explosion proof.

    • Internally explosion proof.

    • Not safe in gas dangerous area.

    Correct Answer
    A. Intrinsically safe.
    Explanation
    The symbol "EX i" indicates that the equipment is intrinsically safe. This means that it is designed to prevent the ignition of hazardous gases or substances, even under fault conditions. Intrinsically safe equipment is commonly used in environments where there is a high risk of explosion, such as oil refineries or chemical plants.

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  • 5. 

    One of the below areas is not a hazardous area:

    • Areas close to cargo tanks and piping.

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

    • Battery and paint locker

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

    Correct Answer
    A. Motor room with supply fans located outside of the dangerous zones.
    Explanation
    The motor room with supply fans located outside of the dangerous zones is not a hazardous area because it is designed to be safe and free from any potential hazards. The supply fans ensure proper ventilation, preventing the accumulation of hazardous gases or fumes. Additionally, being located outside of the dangerous zones further reduces the risk of any potential hazards.

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  • 6. 

    What is meant by being intrinsically safe?

    • Electric wiring executed by approved manufacture?

    • Any electrical product, being water resistant?

    • Product having a special wiring system?

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

    Correct Answer
    A. Cannot produce enough energy to ignite a gas (explode)?
    Explanation
    Being intrinsically safe means that a product or system is designed in such a way that it cannot produce enough energy to ignite a gas and cause an explosion. This is achieved through various safety measures and design features that prevent the generation of sparks or excessive heat. Intrinsically safe products are commonly used in hazardous environments where the presence of flammable gases or vapors is a concern, ensuring that the equipment does not pose a risk of causing an explosion.

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  • 7. 

    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:

    • Ex-d

    • EX-i

    • EX-p

    Correct Answer
    A. EX-p
    Explanation
    The correct answer is EX-p. EX-p refers to equipment that maintains a small internal overpressure to prevent the entry of a gas/air explosive mixture or flammable substance. This means that the equipment is designed to withstand and contain any potential explosions or fires, ensuring the safety of the surrounding environment.

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  • 8. 

    Flanges of some pipe work are bonded because:

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

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

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

    • A,B & D

    Correct Answer
    A. A,B & D
    Explanation
    The flanges of some pipe work are bonded because they can become electrostatically charged by the movement of fluids within them. This can create a potential risk of a spark discharge and ignition of any gas present outside. By earthing the vessel, the build-up of such charges can be prevented. Therefore, options A, B, and D are correct explanations for why the flanges of some pipe work are bonded.

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  • 9. 

    Ex d  is the type of protection designed to:

    • Prevent ignition from arising

    • Prevent ignition from spreading outside enclosure

    • Limit ignition energy

    • Prevent the atmosphere entering the enclosure

    Correct Answer
    A. Prevent ignition from spreading outside enclosure
    Explanation
    Ex d is a type of protection that is designed to prevent ignition from spreading outside the enclosure. This means that it is specifically designed to contain any potential ignition or explosion within the enclosure itself, ensuring that it does not pose a risk to the surrounding environment. This type of protection is commonly used in hazardous areas where there is a high risk of ignition or explosion, such as in oil and gas industries or chemical plants. By preventing the spread of ignition, Ex d protection helps to minimize the potential for damage or harm caused by explosions.

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  • 10. 

    Zone 0, is a Hazardous area:

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

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

    • 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.

    Correct Answer
    A. In which an explosive gas/air mixture is continuously present, or present for long periods.
    Explanation
    Zone 0 is classified as a hazardous area because it is an area where an explosive gas/air mixture is continuously present or present for long periods. This means that there is a constant risk of an explosion occurring in this zone.

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  • 11. 

      Battery spaces may be defined as:-

    • Not hazardous area

    • Hazardous area

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

    Correct Answer
    A. Hazardous area depending upon battery type, capacity and charging arrangement.
    Explanation
    The correct answer is "Hazardous area depending upon battery type, capacity and charging arrangement." This means that battery spaces can be considered hazardous if certain factors such as the type of battery, its capacity, and the charging arrangement are taken into account. The hazards associated with batteries can include the release of toxic gases, the risk of fire or explosion, and the potential for chemical spills. Therefore, it is important to assess these factors when determining whether a battery space is hazardous or not.

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  • 12. 

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

    • Flash point

    • Fire point

    • Ignition temperature

    • All answers are wrong

    Correct Answer
    A. Ignition temperature
    Explanation
    The ignition temperature refers to the minimum temperature at which a material can ignite and sustain combustion without the need for an external source of ignition, such as a flame. This temperature is specific to each material and represents the point at which the material releases enough vapors or gases to form a flammable mixture with the surrounding air. Once this temperature is reached, the material will continue to burn on its own, without the need for an external flame. Therefore, the ignition temperature is the correct answer in this case.

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  • 13. 

    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?

    • Red

    • Orange

    • Blue

    • Green/Yellow

    Correct Answer
    A. Blue
    Explanation
    In installations of intrinsically safe equipment, it is necessary to separate it from non-intrinsically safe equipment and to use a special color. The correct color for this purpose is blue.

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  • 14. 

    Which one of the following is the major secondary parameter for equipment in Hazardous   atmospheres:

    • Gas grouping

    • Surface temperature

    • Protection against ingress of solid bodies and liquid (IP)

    Correct Answer
    A. Protection against ingress of solid bodies and liquid (IP)
    Explanation
    The major secondary parameter for equipment in Hazardous atmospheres is the protection against ingress of solid bodies and liquid (IP). In hazardous environments, it is crucial to prevent the entry of any solid particles or liquids into the equipment, as they can cause damage or malfunction. The IP rating indicates the level of protection provided by the equipment against the ingress of solids and liquids, ensuring its suitability for hazardous environments. Gas grouping and surface temperature are also important considerations in hazardous environments, but they are not specifically related to the protection against ingress of solid bodies and liquid.

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  • 15. 

    Which of the following does not describe a confined space?

    • Limited access

    • Limited natural ventilation

    • Limited working space

    • An area designed for human occupancy

    Correct Answer
    A. Limited natural ventilation
    Explanation
    A confined space is typically characterized by limited access, limited working space, and an area designed for human occupancy. However, limited natural ventilation does not specifically describe a confined space. This means that even if a space has limited natural ventilation, it can still be considered a confined space as long as it meets the other criteria.

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  • 16. 

    HIMAP is -------- measuring and portection device.

    Correct Answer
    HIMAP is hyundai intelligent measuring and protection device
    HIMAP is Highly intelligent measuring and protection device
    Explanation
    The correct answer is that HIMAP stands for Hyundai Intelligent Measuring and Protection Device. This device is used for measuring and protection purposes.

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  • 17. 

    Material which permits the flow of ------ are referred to as conductors

    Correct Answer
    Material which permits the flow of electrons are referred to as conductors
    Explanation
    Conductors are materials that allow the flow of electric current. Electric current is the movement of electrons, so a material that permits the flow of electrons is considered a conductor.

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Quiz Review Timeline (Updated): Jul 17, 2023 +

Our quizzes are rigorously reviewed, monitored and continuously updated by our expert board to maintain accuracy, relevance, and timeliness.

  • Current Version
  • Jul 17, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Jun 21, 2011
    Quiz Created by
    Jimbrown
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