RCDD Chapter 2

46 Questions | Total Attempts: 1426

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RCDD Quizzes & Trivia

RCDD Chapter 2.


Questions and Answers
  • 1. 
    What is the ability of a device ro system to function without error in its intended electromagnetic enviroment?
    • A. 

      EMC

    • B. 

      EMI

    • C. 

      EM

  • 2. 
    What occurs when devices or systems share a common electromagnetic environment and their frequencies for operation over lap.
    • A. 

      EMC

    • B. 

      RF

    • C. 

      EM

    • D. 

      EMI

  • 3. 
    Methods of coupling electromagnetic energy from a source to a receptor fall into one of four categories?
    • A. 

      Conducted (electric current)

    • B. 

      Inductively coupled (magnetic field)

    • C. 

      Capacittively coupled (electric field)

    • D. 

      Radiated (electromagnetic field)

    • E. 

      All of the above.

  • 4. 
    Three essential elements to any EMC problem are?
    • A. 

      A compurter interferes with frequency modulation (FM) radio reception.

    • B. 

      The source of an electromagnetic phenomenon.

    • C. 

      The receptor (e.g., or victim) that cannot function properly due to the electromagnetic phenomenon.

    • D. 

      A path between them that allows the source to interfere with the rectptor.

  • 5. 
    EM waves are distinguished by their wavelenght, which is Directly related to frequency? 2-2
    • A. 

      True

    • B. 

      False

  • 6. 
    Visible light represents a large portion of the EM spectrum? 2-2
    • A. 

      True

    • B. 

      False

  • 7. 
    Conducted interference enters electronic devices primarily through what? 2-2
    • A. 

      Input Signal lines.

    • B. 

      Overhead lighting

    • C. 

      Output signal lines

    • D. 

      Electrical power cords

  • 8. 
    Radiated interference enters electronic devices primarily by meands of what?
    • A. 

      Missing or inadequate enclosures.

    • B. 

      Missing or inadequate device shielding.

    • C. 

      Power cords running parallel with equipment cords.

    • D. 

      Signal lines and proximity to radio frequency (RF) sources

  • 9. 
    A designer is not directly responsible for the EMC of ITS? 2-3
    • A. 

      True

    • B. 

      False

  • 10. 
    EM Fields can be both desirable and undesirable, depending on whether the EM fields interfere with the operation of the network or electronic devices.
    • A. 

      True

    • B. 

      False

  • 11. 
    Electrical power supplies, rectifiers, electrical power cables are just three sources of Internal EMI. Which one of the following bellow is not a source of internal EMI
    • A. 

      AM FM radio

    • B. 

      Electostatic discharge

    • C. 

      Oscillators.

    • D. 

      Digital clocks

  • 12. 
    Autohelm steering a boat off course when a cellular telephone is in use is one example of physical evidence of the effects of EMI?
    • A. 

      True

    • B. 

      False

  • 13. 
    Is there a specific technique or unit to mesure EMC?
    • A. 

      Yes

    • B. 

      No

  • 14. 
    Example threshold values for EM field strength immunity are?
    • A. 

      2 V/m

    • B. 

      3 V/m

    • C. 

      4 V/m

    • D. 

      5 V/m

    • E. 

      Sometimes 10 V/m

  • 15. 
    EMI problems for telecommunications systems can only occure under three simultaneous conditions, which are:
    • A. 

      A coupling path between the interfering source and the susceptible unit.

    • B. 

      Unbalanced signaling or poor dielectric strength

    • C. 

      An interfering source

    • D. 

      A suseptible unit

  • 16. 
    (Incorrect or missing ac surge protection devices) is just one EMI Factor interference in nonrobust sites. What is the "Site issue" that goes along with the statement in parentheses.
    • A. 

      Commercial and standby ac

    • B. 

      Electrical service entrance

    • C. 

      Environmental control Feeder distribution

    • D. 

      Branch distribution and outlets

  • 17. 
    EMC may be interpreted as a level playing field for electronic unwanted signals?
    • A. 

      True

    • B. 

      False

  • 18. 
    EMI is man-made or naturally occurring?
    • A. 

      True

    • B. 

      False

  • 19. 
    Man-made sources of EMI include what?
    • A. 

      Conversion (step up/down)

    • B. 

      Distribution (insulatior, cabling, transformers, or grounding)

    • C. 

      Generators

    • D. 

      Cell phones

    • E. 

      RF

  • 20. 
    Discharge through a spark in the air, radiated effects of ESD, Contact discharge are three types of what?
    • A. 

      EMI (Electromagnetic interference)

    • B. 

      EMC (Electromagnetic compatibility)

    • C. 

      ESD (Electrostatic discharge)

    • D. 

      EM (Electromagnetic)

  • 21. 
    When testing equipment for immunity to radiated fields from 30MHz to 1 gigahertz (GHz), what are the specified severity levels for strengths?
    • A. 

      1 V/m

    • B. 

      1 V/m being a moderate environment

    • C. 

      3 V/m being a moderate environment

    • D. 

      10 V/m

    • E. 

      3 V/M

  • 22. 
    Radio Frequency Immunity is generally stated at ________volts root-mean-spuare (Vrms)
    • A. 

      1

    • B. 

      2

    • C. 

      3

    • D. 

      10

    • E. 

      5

  • 23. 
    What are two types of unwanted signals on a cable?
    • A. 

      Common Mode (CD)

    • B. 

      Current

    • C. 

      Unwanted signal

    • D. 

      Differential Mode (DM)

  • 24. 
    What one of these two unwanted signals (CM),(DM), predominates?
    • A. 

      Common Mode

    • B. 

      Differential Mode

  • 25. 
    Unwanted signal is comprised of two componets CM unwanted signal and DM unwanted signal?
    • A. 

      True

    • B. 

      False

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