Discussion
Consider the following statements about the LVDT.
1. It has no sliding contact 2. Its output is zero at the null 3. It works from a direct voltage supply
Answer: B
Correct answer: 1 and 2 only are correct
Statements 1 and 2 are correct: the core does not touch the windings, so there is nothing to wear and the life is effectively unlimited, and at the null position the two secondaries cancel exactly. Statement 3 is wrong - the primary must be excited with alternating voltage, typically a few kilohertz, since a transformer cannot couple a steady current at all.
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