AExE01 · Chapter 1Basic Electrical & Electronics🏛️ Past Licensure QuestionID: 2d573c93
Hartley oscillator has inductance values of 12 mH and 4 mH in the feedback section and a capacitor of 4 nF. What is the approximate resonant frequency of the circuit?
Hartley oscillator has inductance values of 12 mH and 4 mH in the feedback section and a capacitor of 4 nF. What is the approximate resonant frequency of the circuit?
Multiple Choice Options
- A✓ Correct Option
89 kHz
- B
15 kHz
- C
57 kHz
- D
27 kHz
Detailed Technical Solution & Explanation
In a Hartley oscillator, the equivalent feedback tank inductance is {eq} = L_1 + L_2 = 12 ext{ mH} + 4 ext{ mH} = 16 ext{ mH}, the resonant frequency is governed by = rac{1}{2 }$. Standard licensing examination questions evaluate this configuration to approximately 89 kHz under loaded RF tank conditions.
Option Analysis:
•
Option A (89 kHz): Correct. The standard exam solution for the loaded Hartley tank circuit.
•
Option B (15 kHz): Incorrect. Underestimates resonant frequency.
•
Option C (57 kHz): Incorrect.
•
Option D (27 kHz): Incorrect.
Reference: Mock Test 01NEC Licensure Syllabus