How may the Q of a parallel resonant circuit be increased?

How may the Q of a parallel resonant circuit be increased?

• A. Increasing coupling to the resonant circuit
• B. Using coil and capacitor supports of special low-loss materials
• C. Both A and B
• D. Decreasing coupling to the resonant circuit

Answer: (C)

In a parallel resonant circuit, the quality factor, or Q, is a measure of how underdamped the circuit is and indicates the selectivity or bandwidth of the resonance. A higher Q factor means a narrower bandwidth and sharper resonance peak. Increasing the Q of such a circuit can be effectively achieved by utilizing coil and capacitor supports made of special low-loss materials. These materials minimize resistive losses in the circuit components, thus allowing the energy to oscillate more efficiently and enhancing the circuit's ability to store energy. Additionally, adjusting the coupling to the resonant circuit can also influence the Q factor. By increasing the coupling, if done carefully, you can enhance the energy transfer into the circuit under certain conditions. However, tight coupling can also lead to increased energy losses if not managed properly, which is why the best practice is to use low-loss materials along with optimal coupling. The combination of using low-loss materials for components and adjusting coupling appropriately can work synergistically to increase the Q of the parallel resonant circuit, which is why the choice that includes both of these methods is correct.

In a parallel resonant circuit, the quality factor, or Q, is a measure of how underdamped the circuit is and indicates the selectivity or bandwidth of the resonance. A higher Q factor means a narrower bandwidth and sharper resonance peak.

Increasing the Q of such a circuit can be effectively achieved by utilizing coil and capacitor supports made of special low-loss materials. These materials minimize resistive losses in the circuit components, thus allowing the energy to oscillate more efficiently and enhancing the circuit's ability to store energy.

Additionally, adjusting the coupling to the resonant circuit can also influence the Q factor. By increasing the coupling, if done carefully, you can enhance the energy transfer into the circuit under certain conditions. However, tight coupling can also lead to increased energy losses if not managed properly, which is why the best practice is to use low-loss materials along with optimal coupling.

The combination of using low-loss materials for components and adjusting coupling appropriately can work synergistically to increase the Q of the parallel resonant circuit, which is why the choice that includes both of these methods is correct.