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A rotating phase sequence indicator consists of ________

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A rotating phase sequence indicator consists of ________

(a) 1 coil

(b) 2 coils

(c) 5 coils

(d) 3 coils

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I'm obligated to ask this question of Phase Sequence Indicator topic in portion Measurement of Power and Related Parameters of Electrical Measurements

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The correct choice is (d) 3 coils

The best I can explain: A rotating type of phase sequence indicator basically consists of three coils. These are mounted at 120º to each other is space. The ends of the coils are connected to the terminals R, Y, and B respectively.

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