• Aim
• Theory
• Procedure
• Pre-Test
• Simulation
• Post-Test
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These are the correct answers

1. Answer: a
Explanation: Recommended frequency range of Hartley oscillator is 30KHz-30MHz. Frequencies higher or lower than this range will cause distortion.
2. Answer: c
Explanation: Lower frequencies are theoretically possible in Hartley oscillator however in practice, the achievement of required inductive value is a problem.
3. Answer: a
Explanation: The feedback used in Hartley oscillator is Voltage series feedback.
4. Answer: a
Explanation: Center tapped inductors are used in Hartley oscillator to ensure feedback. These are often in parallel to a variable capacitor, and feedback is sent into the base of the transistor.
5. Answer: c
Explanation: Inductive voltage divider bias is used, wherein a center tapped inductor in parallel to a capacitor is in the feedback network to the base of the transistor/amplifying element.
6. Answer: a
Explanation: There is only one capacitor is used in the tank circuit of Hartley oscillator.
7. Answer: b
Explanation: There are two inductors in the tank circuit and one capacitor, in the Hartley oscillator. Often though, we use a center tapped inductor instead of two inductors.
8. Answer: b
Explanation: Frequency of Hartley oscillator can be expressed as 1/(2ᴨ√LC). L is the total cumulatively coupled mutual inductance if two separate coils are used with mutual inductance M. Frequency of oscillation can be adjusted by varying the tuning capacitor C or the inductance.
9. Answer: d
Explanation: Active element used in Hartley oscillator is Transistor for amplification purposes.
10. Answer: b
Explanation: As normal oscillators, Hartley oscillator also uses positive feedback for sustained oscillation.