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Energy meter reads correctly when the ___________

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in Electrical Measurements by (148k points)
Energy meter reads correctly when the ___________

(a) torque is small

(b) torque is large

(c) torque is medium

(d) torque is zero

The question was posed to me in quiz.

This is a very interesting question from Friction and Overload Compensation topic in section Measurement of Power and Related Parameters of Electrical Measurements

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Right answer is (a) torque is small

Easy explanation: The reading in an energy meter is obtained correctly when the torque value is small at low loads. It is independent of the load on the meter an acts in the same direction as the driving torque.

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