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Measurements and Instrumentation

Q1:

In household energy meters the flux of series magnet is in phase with current but the flux of shunt magnet lags the voltage by 88°. The reading of energy meters

A will be correct

B will have a negative error

C will have a positive error

D may have positive or negative error

ANS:B - will have a negative error

Since angle is less than 90°, reading will be less. Therefore error is negative and correction is positive.



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