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Disc rotation is determined by ________

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+1 vote
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in Electrical Measurements by (148k points)
Disc rotation is determined by ________

(a) the supply voltage

(b) an arrow

(c) the turns ratio

(d) the load current

I have been asked this question in exam.

This question is from Phase Sequence Indicator topic in division Measurement of Power and Related Parameters of Electrical Measurements

1 Answer

+1 vote
by (541k points)
Correct choice is (b) an arrow

Easy explanation: Direction of rotation of the disc is determined by making use of an arrow that is marked on the disc. The phase sequence of the supply voltage is same as that mentioned on the terminals of the meter provided disc rotates in the same direction as the arrow head.

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