Extra exam question E5C12
Subelement E5, ELECTRICAL PRINCIPLES· Group E5C
Which point on Figure E5-1 best represents the impedance of a series circuit consisting of a 300-ohm resistor and a 19-picofarad capacitor at 21.200 MHz?
- A.Point 1 (correct answer)
- B.Point 3
- C.Point 7
- D.Point 8
WhyA series circuit consisting of a 300-ohm resistor and a 19-picofarad capacitor at 21.200 MHz plots at Point 1 on Figure E5-1. A 19-picofarad capacitor at 21.200 MHz has a capacitive reactance of 1 divided by (2 pi times 21.2 MHz times 19 pF), which works out to about 400 ohms, so the series combination of a 300-ohm resistor and this capacitor plots at R equals 300 ohms, X equals negative 400 ohms on Figure E5-1, the coordinates matching Point 1 on the chart, answer A. None of the other labeled points sit at that specific resistance and negative-reactance combination.
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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