Examkin

Question

Difficulty: MediumCapacitors

Match each capacitor circuit application with its primary functional role in electronic systems.

  • Coupling CapacitorTransfers alternating signal voltages between amplifier stages while blocking direct current bias levels
  • Filter CapacitorSmooths pulsating direct current output from a power supply rectifier into a steady direct voltage
  • Bypass CapacitorDiverts alternating current noise or high-frequency signals directly to ground around a circuit component
  • Tuning CapacitorProvides adjustable capacitance to set the resonant frequency in radio frequency selector circuits

Answer

Coupling Capacitor matches transferring AC signal voltages between amplifier stages while blocking DC bias levels; Filter Capacitor matches smoothing pulsating direct current output from a rectifier; Bypass Capacitor matches diverting AC noise or signals directly to ground around a component; Tuning Capacitor matches providing adjustable capacitance to set resonant frequency in RF circuits.
Each application corresponds directly to fundamental capacitive behaviors: coupling capacitors leverage DC-blocking and AC-passing in series with the signal path; filter capacitors utilize charge storage to smooth rectified DC voltage ripple; bypass capacitors create a low-reactance parallel path to ground for AC signals; and tuning capacitors provide variable capacitance for frequency selection in resonant LC circuits.

Step-by-Step Solution

1
Determine the function of a coupling capacitor in multi-stage signal amplification.
Coupling capacitors block DC bias voltages while passing AC information signals between amplifier stages.
Capacitors provide infinite opposition (reactance) to zero-frequency DC while exhibiting low capacitive reactance to high-frequency AC signals.
2
Determine the function of a filter capacitor in a DC power supply.
Filter capacitors reduce voltage ripple by charging at peak rectified voltages and discharging during valleys.
This energy storage smooths pulsating DC output into a steady DC voltage for electronic circuits.
3
Determine the function of a bypass capacitor across a circuit element.
Bypass capacitors shunt alternating current signals to ground around a component without disturbing the DC operating point.
The capacitor provides an alternate low-reactance path for AC currents.
4
Determine the function of a tuning capacitor in radio frequency systems.
Tuning capacitors vary circuit capacitance to alter the resonant frequency of an LC circuit.
Resonant frequency varies inversely with the square root of capacitance, allowing station or frequency selection.

Key Concept

Operational roles and circuit applications of capacitors across DC power filtering, signal coupling, AC bypassing, and RF tuning
Estimated Time:1m 0s
Rate this question

Topics

Capacitors

More questions from this topic