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Iron loss of a transformer can be measured by low power factor wattmeter.

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Answer : In an actual transformer the iron loss remains practically constant from no load to full load because core flux remains practically constant.

Answer : If the supply frequency to the transformer is increased, the iron loss will increase.

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Answer : At full -load of a transformer, the iron loss and copper loss are 3000 W and 4000 W respectively. Then total loss at maximum efficiency is : 6000 W

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Answer : When secondary of a current transformer is open-circuited its iron core will be hot because of heavy iron losses taking place in it due to high flux density.

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Answer : A ferrite core has less eddy current loss than an iron core because ferrites have high hysteresis.

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Answer : A 40 kVA transformer has a core loss of 400 W and a full load copper loss of 800 W. The proportion of full load at maximum efficiency is 0.707

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Description : Corona loss in transmission lines can be reduced by (A) using small diameter conductors (B) using bundled conductors (C) using less spacing between conductors (D) increasing the transmission line voltage

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Description : How can power loss be reduced?

Description : The power consumed by a balanced 3-ph load is measured by two-wattmeter method. The meter readings are 8 kW and 4 kW. The power factor of the load is (A) zero (B) 0.5 (C) between zero and 0.5 (D) between 0.5 and unity

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Answer : The purpose of providing an iron core in a transformer is to decrease the reluctance of the magnetic path.

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Answer : In AC. circuits, laminated iron is invariably used in order to reduce eddy current loss.

Answer : Iron losses in a D.C. machine are independent of variations in load.

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Answer : A transformer oil must be free from moisture.

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Description : In a transformer the resistance between its primary and secondary should be?

Answer : In a transformer the resistance between its primary and secondary should be infinity.

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Description : The changes in the volume of transformer cooling oil due to the variation of atmospheric temperature during day and night is taken care of by which part of the transformer?

Answer : The changes in the volume of transformer cooling oil due to the variation of atmospheric temperature during day and night is taken care of by conservator.

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