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Sinusoidal AC

An LVDT is su...

Question

An LVDT is supplied with a sinusoidal voltage of amplitude 5 V and frequency 1 kHz. The output is connected to an ac voltmeter. The reading of the voltmeter is 1 V for a displacement of 1 mm from the null position. When the displacement is 1 mm in the opposite direction from the null position, the reading of the voltmeter is

A

-1 V

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B

-0.2 V

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C

1 V

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D

5 V

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Solution

The correct option is C 1 V
From the output characteristics of LVDT as shown below, the output voltage is 1 V.

Since output of LVDT is sinusoidal, so meter used to measure output voltage is RMS measuring meter and RMS value is always greater than zero. $E_{0} = | E_{1} - E_{2} | = 1 V$

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