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Answer :

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

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Description : In an actual transformer the iron loss remains practically constant from no load to full load because?

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.

Description : 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 :  (A) 7000 W (B) 6000 W (C) 8000 W (D) 4000 W

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

Description : Dielectric loss in a capacitor is best measured by (A) Wien Bridge (B) Schering Bridge (C) Anderson Bridge (D) Heaviside-Campbell Equal Ratio Bridge

Answer : Dielectric loss in a capacitor is best measured by Schering Bridge

Description : When secondary of a current transformer is open-circuited its iron core will be?

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.