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Resistance of pressure coil in a low power factor dynamometer type wattmeter is ________

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Resistance of pressure coil in a low power factor dynamometer type wattmeter is ________

(a) once time

(b) three times

(c) hundred times

(d) ten times

The question was asked during an interview for a job.

My question is based upon Low Power Factor Wattmeter in division Measurement of Power and Related Parameters of Electrical Measurements

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The correct answer is (d) ten times

The best explanation: In a low power factor dynamometer type wattmeter, pressure coil has a resistance value that is one tenth of the actual with respect to unity power wattmeters. This is done in order to ensure a reasonable amount of torque at low power factors.

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