Extra exam question E7H05
Subelement E7, PRACTICAL CIRCUITS· Group E7H
How is positive feedback supplied in a Pierce oscillator?
- A.Through a tapped coil
- B.Through link coupling
- C.Through a neutralizing capacitor
- D.Through a quartz crystal (correct answer)
WhyA Pierce oscillator supplies its positive feedback through a quartz crystal. A Pierce oscillator supplies its positive feedback through the quartz crystal itself, which functions as the sharply frequency-selective feedback element that sets and stabilizes the oscillation frequency, answer D. A tapped coil and capacitive divider describe Hartley and Colpitts feedback instead, and a neutralizing capacitor serves an unrelated purpose in amplifier stability, not oscillator feedback.
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.