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Interview
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Capacitors Questions
Capacitors and energy storage in electronics In a basic capacitor with two conducting plates separated by a dielectric, in what physical form is the stored energy held?
Sinusoidal AC phase relationships For an ideal capacitor driven by a sinusoidal source, the source voltage across the capacitor will _____ the current by 90°.
Capacitive reactance calculation At f = 500 kHz, what capacitor value C gives a capacitive reactance Xc of 1 kΩ? (Use Xc = 1 / (2π f C)).
Capacitor behavior after disconnection If a charged capacitor is disconnected from its circuit and left isolated (ideal conditions), what happens to its stored charge?
Diagnosing capacitor faults When a capacitor is described as “leaky,” what has happened to its dielectric property compared to normal?
RC response to a square wave A resistor in series with a capacitor, with the output taken across the capacitor and driven by a square-wave source, behaves as which signal-shaping circuit?
Variable capacitor dielectrics in tuning and trimming Which dielectric materials are commonly used in variable capacitors and trimmer capacitors?
Capacitors in basic circuits — identify the correct statement In ideal circuit theory, select the single true statement about how a capacitor behaves under DC and during transients.
Series capacitors voltage division — two-capacitor stack at 18 V DC Two capacitors are in series: C1 = 4.7 µF and C2 = 3.3 µF. With 18 V DC applied across the series, what is the voltage across C1?
Electric field between parallel plates — dependence on geometry The electric field strength between two parallel plates is proportional to the applied potential difference and inversely proportional to which geometric parameter?
Capacitance from charge and voltage — sizing a capacitor from Q and V A capacitor stores 2 coulombs of charge when 500 V is applied across its plates. What is its capacitance?
RC series behavior — interpreting zero voltage across the resistor In a series R–C circuit connected to a DC source, if the measured voltage across the resistor is zero at steady observation, the capacitor is:
When does current flow in a capacitive branch? For an ideal capacitor in a circuit, current is present during which time intervals?
Series RC under AC — name of total opposition to current In an AC-driven series R–C circuit, what is the proper term for the total opposition to current considering both resistance and capacitive effects?
Find capacitive reactance at 1 kHz for a 4.7 µF capacitor A capacitor C = 4.7 µF is connected to a sinusoidal source of frequency f = 1 kHz. What is its capacitive reactance Xc?
Series combination of capacitive reactances — qualitative effect on total Xc When capacitive reactances are connected in series, what happens to the total capacitive reactance of the combination?
In basic electronics, a capacitor is constructed from two parallel conductive plates separated by an insulating dielectric. Which type of materials form the two parallel elements?
In capacitor charging behavior, how is the time variation of voltage and current most accurately characterized for a simple RC network driven by a DC step?
A 0.4 µF capacitor is in series with a resistor and driven by a 4 kHz, 40 V_ac (RMS) source. If the series current is 40 mA (RMS), what is the total series impedance magnitude of the circuit?
For an RC circuit with time constant tau = R * C, which action will increase the time constant without altering topology?
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