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Measurements and Instrumentation - Engineering

Q1:

In a moving iron voltmeter the coil has a resistance of 20 Ω and an inductance of 0.3 H. The swamping resistance in 2000 Ω. To ensure correct reading with dc as well as 50 Hz ac, the value of capacitor to be connected in parallel with swamping resistance should be

A 0.0125 μF

B 0.0311 μF

C 0.0521 μF

D 0.0622 μF

ANS:B - 0.0311 μF

C = 0.41 L/R2 or C = (0.41 x 0.3)/(2000)2 = 0.0311 x 10-6 F.