Extra exam question E7C01
Subelement E7, PRACTICAL CIRCUITS· Group E7C
How are the capacitors and inductors of a low-pass filter Pi-network arranged between the network’s input and output?
- A.Two inductors are in series between the input and output, and a capacitor is connected between the two inductors and ground
- B.Two capacitors are in series between the input and output, and an inductor is connected between the two capacitors and ground
- C.An inductor is connected between the input and ground, another inductor is connected between the output and ground, and a capacitor is connected between the input and output
- D.A capacitor is connected between the input and ground, another capacitor is connected between the output and ground, and an inductor is connected between the input and output (correct answer)
WhyA low-pass filter Pi-network has a capacitor from the input to ground, another capacitor from the output to ground, and an inductor connected between the input and output. A low-pass Pi-network arranges a capacitor from the input to ground, another capacitor from the output to ground, and an inductor connected directly between the input and output, the characteristic Pi-shaped layout (two shunt capacitors flanking a series inductor) that passes low frequencies while attenuating higher ones, answer D. Arrangements using two series inductors with a shunt capacitor, or two series capacitors with a shunt inductor, describe different network topologies, not this low-pass Pi-network.
Published 2026-08-28 · Last updated 2026-08-28 · Question text is verbatim from the 2024-2028 NCVEC Element 4 pool (public domain); the explanation above is original writing, see our methodology.
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