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Describe the working principle of a piezoelectric speaker.
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How does a varactor diode change capacitance with voltage?
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Explain the operation of a NAND gate using truth tables.
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Describe the working principle of a solenoid valve.
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How does a Hall effect sensor measure magnetic fields?
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Explain the operation of a Schmitt trigger circuit.
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Describe the operation of a voltage multiplier circuit.
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How does a capacitor discharge over time in an RC circuit?
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What is the difference between analog and digital signals?
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Describe the operation of a phase-locked loop (PLL) circuit.
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How do proximity sensors detect the presence of an object?
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What is the role of a choke coil in filtering circuits?
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Explain the concept of frequency in electronic circuits.
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