Extra exam question E5C03
Subelement E5, ELECTRICAL PRINCIPLES· Group E5C
Which of the following represents a pure inductive reactance in polar coordinates?
- A.A positive 45 degree phase angle
- B.A negative 45 degree phase angle
- C.A positive 90 degree phase angle (correct answer)
- D.A negative 90 degree phase angle
WhyA pure inductive reactance is represented in polar coordinates by a positive 90 degree phase angle. A pure inductive reactance, having no resistive component at all, sits at a positive 90 degree phase angle in polar coordinates, straight up the imaginary axis, answer C. A negative 90 degree angle would represent pure capacitive reactance instead, and 45 degree angles represent a mix of equal resistance and reactance, not a pure reactance.
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.
Related questions
- E5C01Which of the following represents pure capacitive reactance of 100 ohms in rectangular notation?
- E5C02How are impedances described in polar coordinates?
- E5C04What type of Y-axis scale is most often used for graphs of circuit frequency response?
- E5C05What kind of diagram is used to show the phase relationship between impedances at a given frequency?
- E5C06What does the impedance 50 - j25 ohms represent?