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Half Wave Rectifier Type Instrument

The sensitivi...

Question

The sensitivity of PMMC instrument is $10 k Ω / V$ . If this instrument is used in rectifier type voltmeter with half wave rectification the sensitivity will become _______ $k Ω / V$
4.5

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Solution

The correct option is A 4.5
$S_{a c} = 0.45 S_{d c}$ (for half wave rectifier)

$S_{a c} = 0.9 S_{d c}$ (for full wave rectifier)

Here, $S_{d c} = 10 k Ω / V$

$∴ S_{a c} = 0.45 \times 10 = 4.5 k Ω / V$

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