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

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| By Jimbrown
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  • 1/10 Questions

    Surge arresters abord  marine are used for the protection of

    • Motors
    • Generators
    • Transformers
    • All components and switch gears
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About This Quiz

Electricity moves quickly through the water, and the human body consists mostly of water; it is dangerous when it comes to our body. To protect yourself, you should properly educate yourself and ensure that your work environment is safe and free of electrical hazards. Take this 4th electrical safety rules test and see just how much you know. All the best!

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

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  • 2. 

    Surge voltage originate in power systems due to

    • Lightning

    • Switching operations

    • Faults

    • A,B & C

    Correct Answer
    A. A,B & C
    Explanation
    Surge voltage can originate in power systems due to various reasons, including lightning, switching operations, and faults. Lightning strikes can cause a sudden increase in voltage, leading to a surge. Switching operations, such as turning equipment on or off, can also result in voltage surges. Additionally, faults in the power system, such as short circuits or equipment malfunctions, can cause sudden voltage spikes. Therefore, surge voltage can occur due to any combination of these factors, represented by options A, B, and C.

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  • 3. 

    Switching surge is

    • High voltage dc

    • High voltage ac

    • Short duration transient voltage

    • Hyperbolically dying voltage.

    Correct Answer
    A. Short duration transient voltage
    Explanation
    Switching surge refers to a sudden and temporary increase in voltage that occurs when a switch or circuit is turned on or off. This surge can cause a short duration transient voltage, which is a brief and temporary fluctuation in voltage levels. It is not a high voltage dc or ac, nor is it hyperbolically dying voltage.

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  • 4. 

    Which of the following gas has been used as insulating medium in electrical appliances?

    • Nitrogen

    • Carbon dioxide

    • Sulphur hexafluoride

    • Freon.

    Correct Answer
    A. Sulphur hexafluoride
    Explanation
    Sulphur hexafluoride is commonly used as an insulating medium in electrical appliances. It has excellent electrical insulation properties, high dielectric strength, and is chemically stable, making it ideal for use in high-voltage equipment. It is also non-toxic and non-flammable, making it a safe choice for electrical insulation.

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  • 5. 

    The medium employed for the extinction of  arc in air circuit breaker is 

    • SF6

    • Oil

    • Air

    • Water

    Correct Answer
    A. SF6
    Explanation
    SF6 (sulfur hexafluoride) is the medium employed for the extinction of an arc in an air circuit breaker. SF6 is a highly stable and non-flammable gas that has excellent electrical insulation properties. When an arc is formed in the circuit breaker, SF6 gas is released to extinguish the arc by rapidly cooling and suppressing the ionization. This allows for a quick and efficient interruption of the current flow. Compared to other mediums like oil, air, or water, SF6 is the most suitable choice for extinguishing arcs in air circuit breakers.

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  • 6. 

    The minimum IR value usually recommended for MV machines as

    • 1K Ohm/volt

    • Machine voltage (KV+1M) Ohm

    • Machine rating

    • None of the answers are correct

    Correct Answer
    A. Machine voltage (KV+1M) Ohm
    Explanation
    The minimum IR value recommended for MV (medium voltage) machines is typically calculated using the machine voltage (KV) plus 1M (megaohm). This value is important for determining the insulation resistance of the machine, which is necessary for ensuring the proper functioning and safety of the equipment.

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  • 7. 

    Electro-mechanical breakdown of solid insulating materials occurs due to

    • Magnetic bum

    • Vibrations

    • Mechanical stresses produced by the electrical field

    • Electrical stresses produced by the voltage fluctuations.

    Correct Answer
    A. Electrical stresses produced by the voltage fluctuations.
    Explanation
    Solid insulating materials can experience electro-mechanical breakdown when exposed to voltage fluctuations. These fluctuations create electrical stresses within the material, causing it to break down. This breakdown occurs due to the interaction between the electrical field and the mechanical stresses produced.

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  • 8. 

    Additional earthing can be connected local to work:

    • For extra confidence and operator safety

    • It is a mandatory requirement

    • For the protection of the equipment from experiencing any accidently applied

    Correct Answer
    A. For extra confidence and operator safety
    Explanation
    Connecting additional earthing local to work provides an extra layer of safety and confidence for the operator. This ensures that any potential electrical faults or accidents are properly grounded, reducing the risk of electric shock or other injuries. While it may not be a mandatory requirement in all cases, it is highly recommended for the protection of both the operator and the equipment being used.

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  • 9. 

    Minimum insulation resistance value recommended for  LV machines as

    • 1M Ohm/1000V

    • 2M Ohm/1000V

    • 1000K Ohm/1000VAC

    • A & C

    Correct Answer
    A. A & C
    Explanation
    The minimum insulation resistance value recommended for LV machines is 1M Ohm/1000VAC. This is because a high insulation resistance is necessary to ensure the safety and proper functioning of the machine. Insulation resistance is a measure of how well the insulation material is able to resist the flow of electrical current. A higher resistance value indicates better insulation and reduces the risk of electrical leakage or short circuits. Therefore, a minimum value of 1M Ohm/1000VAC is recommended to ensure the machine's insulation is adequate. Option A and C both mention this correct value.

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  • 10. 

    Which of the statements  is true with respect to ISAH3300M 

    • It is a low voltage a.c motor protction device.

    • It proveds off line protection to 3.3 KV motor against ground fault.

    • It provides on line protection to 3.3KV motor against ground fault.

    • It is a low current protection relay used in the circuit of Cargo P/P motor

    Correct Answer
    A. It proveds off line protection to 3.3 KV motor against ground fault.
    Explanation
    The correct answer is "It provides off-line protection to 3.3 KV motor against ground fault." This means that ISAH3300M is a device that offers protection to a 3.3 KV motor when it is not in operation or offline, specifically against ground faults.

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