Engineering Quiz: Electromagnetic Interference (EMI)

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Engineering Quiz: Electromagnetic Interference (EMI) - Quiz

Most of the things today are being controlled by electricity, and one of the ways through which this equipment may stop functioning is through the introduction of electromagnetic interference. EMI is any frequency of electrical noise. What do you know about electromagnetic interference (EMI)? Take up the quiz below and get to learn more about it. All the best!


Questions and Answers
  • 1. 

    You will find all the background information needed here. 

  • 2. 

    Scientists concluded from another experiment that fiberglass was the best insulator because it was the poorest heat conductor. Does the data from this experiment support their conclusion?

    • A.

      No, because asbestos conducted less heat than fiberglass

    • B.

      Yes, because the heat flow for fiberglass was negative in some cases

    • C.

      Yes, because the fiberglass had the highest initial temperature in trial 2

    • D.

      Yes, because the fiberglass insulator was tested multiple times

    Correct Answer
    A. No, because asbestos conducted less heat than fiberglass
    Explanation
    The data from this experiment does not support their conclusion because asbestos, not fiberglass, conducted less heat.

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  • 3. 

    The scientists in this experiment hypothesized that thicker insulators would conduct less heat. Did the data in this experiment support their conclusion?

    • A.

      Yes, because for each material, the thicker insulator had less heat flow

    • B.

      Yes, because the final temperature was always higher with thick versus thin insulator

    • C.

      No, because the heat flow depended only on the type of material, not thickness

    • D.

      No, because the heat flow depended only on the temperature of the oven

    Correct Answer
    A. Yes, because for each material, the thicker insulator had less heat flow
    Explanation
    The data in this experiment supported their conclusion because for each material, the thicker insulator had less heat flow. This suggests that thicker insulators indeed conduct less heat, which aligns with the scientists' hypothesis.

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  • 4. 

    A student hypothesizes that when the outside temperature is lower than the starting temperature of the water, then the heat will travel out of the water into the surroundings. Does the data support this hypothesis?

    • A.

      Yes, because the heat flow is negative when the oven temperature is lower than the initial temperature of the water

    • B.

      Yes, because the heat flow is positive when the oven temperature is lower than the initial temperature of the water

    • C.

      No, because the heat flow depends only on the type and thickness of material used as an insulator

    • D.

      No, because the heat flow is negative when the oven temperature is higher than the initial temperature of the water

    Correct Answer
    A. Yes, because the heat flow is negative when the oven temperature is lower than the initial temperature of the water
    Explanation
    The correct answer is "yes, because the heat flow is negative when the oven temperature is lower than the initial temperature of the water." This supports the student's hypothesis because a negative heat flow indicates that heat is being transferred out of the water into the surroundings, which aligns with the idea that when the outside temperature is lower than the starting temperature of the water, heat will travel out of the water.

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  • 5. 

    A student concluded that the worst insulator tested was rubber, because it had the highest heat conductance. Does the data from this experiment support this conclusion?

    • A.

      Yes, because the heat flow for rubber was greater than any other material

    • B.

      Yes, because the heat flow for rubber was less than any other material

    • C.

      No, because the heat flow for rubber was the greatest of any material

    • D.

      No, because the asbestos insulators had the lowest heat flow

    Correct Answer
    A. Yes, because the heat flow for rubber was greater than any other material
    Explanation
    The given correct answer suggests that the student's conclusion is supported by the data from the experiment. The student concluded that rubber is the worst insulator because it had the highest heat conductance, which means that it allowed the most heat to flow through it compared to the other materials tested. Therefore, the data showing that the heat flow for rubber was greater than any other material supports the student's conclusion.

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  • 6. 

    The output power of the cascaded amplifier/attenuator system can be determined using 

    • A.

      Actual gain of amplifier

    • B.

      Actual gain of amplifier and attenuator

    • C.

       Gain in dB of amplifier and attenuator

    • D.

      Actual gain of attenuator

    Correct Answer
    B. Actual gain of amplifier and attenuator
    Explanation
    The output power of the cascaded amplifier/attenuator system can be determined using the actual gain of both the amplifier and attenuator. The actual gain of the amplifier represents the amplification factor, while the actual gain of the attenuator represents the attenuation factor. By multiplying these two factors together, we can calculate the overall gain of the system.

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  • 7. 

     LISN is a device used to measure conducted emissions. LISN stands for

    • A.

       Line integrated stabilization network

    • B.

      Line impedance stabilization network

    • C.

      Line integrated stored network

    • D.

       Laser integrated stabilization networking

    Correct Answer
    B. Line impedance stabilization network
    Explanation
    A LISN is a device used to measure conducted emissions. It is designed to provide a stable impedance to the equipment under test, isolating it from the power source and providing a standardized impedance for accurate measurements. Therefore, the correct answer is "Line impedance stabilization network."

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  • 8. 

     In EMC signal, the source delivers maximum power to the input of the transmission line when the transmission line input impedance

    • A.

      Is equal to the source resistance

    • B.

      Greater than the source resistance

    • C.

      Smaller than the source resistance

    • D.

      None of these

    Correct Answer
    A. Is equal to the source resistance
    Explanation
    The maximum power transfer theorem states that maximum power is transferred from a source to a load when the impedance of the load matches the internal impedance of the source. In this case, if the transmission line input impedance is equal to the source resistance, it means that the load impedance matches the internal impedance of the source, resulting in maximum power transfer. Therefore, the source delivers maximum power to the input of the transmission line when the transmission line input impedance is equal to the source resistance.

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  • 9. 

    The effects of EMI can be reduced by 

    • A.

      Suppressing emissions

    • B.

      Reducing the efficiency of the coupling path

    • C.

      Reducing the susceptibility of the receptor

    • D.

      All of these

    Correct Answer
    D. All of these
    Explanation
    The effects of electromagnetic interference (EMI) can be reduced by implementing various measures. Suppressing emissions involves minimizing the generation of electromagnetic waves by using shielding materials or filters. Reducing the efficiency of the coupling path refers to minimizing the ability of electromagnetic waves to couple into sensitive equipment by implementing proper grounding and shielding techniques. Reducing the susceptibility of the receptor involves designing equipment with improved immunity to EMI by using robust components and proper circuit layout. Therefore, implementing all of these measures can effectively reduce the effects of EMI.

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