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Which of the following can measure iron loss of a transformer?

Which of the following can measure iron loss of a transformer? Correct Answer Low power factor wattmeter

As the secondary side is open in OC, the entire coil will be purely inductive in nature. So, the power will be lagging due to inductive property of the circuit. So LPF (Low power factor) wattmeter is used in open circuit test of transformer.

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