The sensitivity of LVDT is mainly due to

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BPSC AE Paper 5 (Electrical) 25 Mar 2022 Official Paper
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  1. magnetic shielding of the core
  2. exact cancellation of secondary voltages
  3. permeability of the core
  4. insulation used in the winding

Answer (Detailed Solution Below)

Option 2 : exact cancellation of secondary voltages
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LVDT:

  • LVDT stands for Linear Variable Differential Transformer.
  • It is the most widely used inductive transducer that converts linear motion into an electrical signal.
  • The output of LVDT is so high that it doesn't need any amplification.
  • The transducer has a high sensitivity which is typically about 40V/mm.
  • The sensitivity of LVDT is mainly due to the exact cancellation of secondary voltages.
  • The sensitivity of the LVDT depends on the excitation voltage, the resistance of the secondary windings, the circuits connected to these windings, and the frequency of excitation.
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