In an LVDT, the primary winding is connected to what type of voltage?

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Multiple Choice

In an LVDT, the primary winding is connected to what type of voltage?

Explanation:
Excitation with alternating voltage is essential. The LVDT uses a transformer-like arrangement, so the primary must produce a changing magnetic flux. That changing flux induces voltages in the secondary windings, and the way those voltages balance or differ depends on how far the ferromagnetic core is moved. If you fed the primary with DC, the flux would quickly saturate the core and no useful, varying secondary signal would be produced (and you wouldn’t get a linear displacement indication). Pulsed excitation isn’t the standard approach because it complicates demodulation and steady, continuous position output. So the primary is driven with AC voltage to enable reliable, proportional sensing.

Excitation with alternating voltage is essential. The LVDT uses a transformer-like arrangement, so the primary must produce a changing magnetic flux. That changing flux induces voltages in the secondary windings, and the way those voltages balance or differ depends on how far the ferromagnetic core is moved. If you fed the primary with DC, the flux would quickly saturate the core and no useful, varying secondary signal would be produced (and you wouldn’t get a linear displacement indication). Pulsed excitation isn’t the standard approach because it complicates demodulation and steady, continuous position output. So the primary is driven with AC voltage to enable reliable, proportional sensing.

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