LearnEMC
@LearnEmc
LearnEMC helps companies build the in-house expertise they need to ensure their products will meet electromagnetic compatibility requirements.
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EMC Question of the Week: A 100-MHz signal generator in a shielded enclosure drives a matched load on a circuit board through a 50-cm coaxial cable. Which option below generates the lowest radiated emissions? Full question and answer at learnemc.com/emc-question-o….
EMC Question of the Week: A differential signal propagates on a pair of microstrip traces then transitions to a twisted wire pair. What would cause a differential-mode to common-mode conversion at the interface? Full question and answer at learnemc.com/emc-question-o….
EMC Question of the Week: The displacement current in a transmission line flows back and forth in a direction that is ____________ relative to the direction of the wave propagation. a) parallel b) perpendicular c) circular d) at a 45° angle. Answer at learnemc.com/emc-question-o….
EMC Question of the Week: The conduction currents in a transmission line flow a) in the conductors b) in the dielectric c) towards the load d) in small eddies. Answer at learnemc.com/emc-question-o….
EMC Question of the Week: Which of the IV curves shown in the figure describes the behavior of a metal oxide varistor (MOV)? Answer at learnemc.com/emc-question-o….
EMC Question of the Week: A good rule of thumb for ensuring that crosstalk between microstrip traces is -20 dB or lower is to maintain a spacing that is at least three times the trace a) width b) length c) height d) thickness. Answer at learnemc.com/emc-question-o….
EMC Question of the Week: At 100 MHz, a tinted window (εr = 8, thickness = 3 mm) has a plane wave shielding effectiveness of approximately a) 0 dB b) 2 dB c) 4 dB d) 6 dB Answer at learnemc.com/emc-question-o….
EMC Question of the Week: How many fundamental EM coupling mechanisms are there? a) two b) three c) four d) more than four Answer at learnemc.com/emc-question-o….
EMC Question of the Week: In an EMI test, one device produces a 40 dB(μV/m) field and another 34 dB(μV/m). What is the measured field strength from both devices? a) 41 dB(μV/m) b) 43.5 dB(μV/m) c) 71 dB(μV/m) d) 74 dB(μV/m) Full question and answer at learnemc.com/emc-question-o….
EMC Question of the Week: Which of these currents is primarily responsible for radiated emissions from cables? a) odd mode b) even mode c) differential mode d) common mode Answer at learnemc.com/emc-question-o….
EMC Question of the Week: Which material property is primarily responsible for the loss in a high-frequency ferrite bead or ferrite core used for EMI suppression? a) complex permittivity b) complex permeability c) conductivity d) eddy currents Answer at learnemc.com/emc-question-o….
EMC Question of the Week: Which of the following is NOT one of Maxwell's equations? a) Ohm's Law b) Gauss's Law c) Ampere's Law d) Faraday's Law Answer at learnemc.com/emc-question-o….
EMC Question of the Week: Which plot is most helpful for predicting common-mode choke performance? a) attenuation vs. frequency b) impedance magnitude vs. frequency c) complex impedance vs. frequency d) complex core permeability vs. frequency Answer at learnemc.com/emc-question-o….
EMC Question of the Week: The resolution bandwidth of a signal sampled in the time-domain and displayed in the frequency domain is determined by the a) acquisition time b) sampling rate c) windowing function d) scope bandwidth Answer at learnemc.com/emc-question-o….
EMC Question of the Week: The length of a two-terminal surface-mount component is always the a) longest dimension b) longest dimension that is not the height c) distance between end caps d) distance between outer edges of end caps Answer at learnemc.com/emc-question-o….
EMC Question of the Week: The sum of the currents flowing into a circuit node is essentially zero as long as we can neglect the a) parasitic inductances b) parasitic capacitances c) parasitic resistances d) laws of physics Answer at learnemc.com/emc-question-o….
EMC Question of the Week: If a board-mounted common-mode choke connects directly to the connector pins, with no Y-capacitors in between, then the common-mode choke should be a) bifilar wound b) low loss c) lossy d) removed Answer at learnemc.com/emc-question-o….
EMC Question of the Week: For a signal propagating in a transmission line, what must remain constant to avoid reflections? a) the ratio of the voltage to the current b) the ratio of the E and H fields c) wire diameter d) propagation direction Answer at learnemc.com/emc-question-o….
EMC Question of the Week: A shielded cable with twisted-wire-pairs carrying high-frequency signals connects to a circuit board mounted in a plastic enclosure with no metal chassis. How and where should the shield be connected? Full question and answer at learnemc.com/emc-question-o….
EMC Question of the Week: The main purpose of a shielded cable's drain wire is to provide: a) mechanical strength b) a path for low-frequency current c) an earth ground connection d) a connection to the connector shield. Answer at learnemc.com/emc-question-o….
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