How much do you know about Electromagnetic Compatibility?

Quiz Questions

• 1.
  1. The most efficient & practical for solving EMI problems is by

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  • A.
    acting on the source of interference.
  • B.
    acting on the victim equipment.
  • C.
    acting on the coupling paths.
  • D.
    changing the frequency of the EMI source.
• 2.
  2. Common Impedance Coupling is caused by

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  • A.
    the self-inductance of ordinary power distribution conductors.
  • B.
    the exposure of a system cabling to strong magnetic fields.
  • C.
    the susceptibility of a system power supply to lightning transients.
  • D.
    the lack of equipotentiality between different circuits sharing a same ground or same power distribution conductors.
• 3.
  3. About Coaxial Cables

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  • A.
    A coaxial cable shield should be connected to the signal ground and to the equipments chassis at both ends.
  • B.
    A coaxial cable must be connected to the signal ground only.
  • C.
    A coaxial cable shield should be connected to the signal ground at both ends, and in addition to a good earth rod at the source side.
  • D.
    A coaxial cable shield should be connected to the signal ground at both ends, and to the chassis ground at one end only, to avoid ground loops.
• 4.
  4. To be in far-field conditions, a shield must

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  • A.
    be at more than one wave-length away from the radiating source.
  • B.
    be at more than 1/6 wave-length from the source, if the latter is a magnetic antenna.
  • C.
    be at more than 1/6 wave-length from the source, whatever the type of antenna.
  • D.
    be near or in a far-field condition, depend if the source is inside or outside.
• 5.
  5. Best protection against power line disturbances is offered by

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  • A.
    an isolation transformer.
  • B.
    an isolation transformer plus Differential Mode TVS.
  • C.
    an isolation transformer plus a filter with Differential Mode & Common Mode elements and TVS.
  • D.
    transient Suppressors.
• 6.
  6. About Capacitive Filters

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  • A.
    Capacitive filters are preferable when source and load are high impedances.
  • B.
    Capacitive filters are preferable when source and load are low impedances.
  • C.
    Capacitive filters are preferable when source impedance is low and load impedance is high.
  • D.
    Capacitive filters must always have an inductance associated with the capacitor.
• 7.
  7. MIL-STD-461 vs Civilian EMC tests

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  • A.
    Both MIL-STD-461 and Civilian tests are using the same procedures and test set-up.
  • B.
    MIL-STD-461 vs Civilian EMC tests practices are very similar for conducted EMI but significantly different for radiated measurements.
  • C.
    Civilian radiated tests require exclusively an open field site for radiated EMI.
  • D.
    MIL-STD-461 vs Civilian EMC tests are totally different.

Quiz Outcomes

• 1.
  a great result

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