Transformers Objectives Part 01

01 . Laminating the core of the transformer is minimized by the Eddy current loss

02 . The function of breather in a transformer is to arrest flow of moisture when outside air enter the transformer

03 . Iron loss in a transformer occurs in Core

04 . Under no load condition Copper loss is negligible

05 . Open circuit test of a transformer gives sum of hysteresis and eddy current loss.

06 . Copper loss in a transformer occurs in Winding.

07 . Back to back test of a transformer provides information about regulation, efficiency and heading under load condition

08 . For a transformer the condition for maximum efficiency is when Copper loss is equal to the iron loss

09 . Eddy current losses in a transformer core can be reduced by reducing the thickness of laminations.

10 . In a transformer the magnetic coupling between the primary and secondary circuit can be increased by using the magnetic core of low reluctance.

11 . If flux density in the core of a transformer then the size of the transformer can be reduced

12 . Copper loss in a transformer varies significantly with load

13 . Voltage remain constant if the frequency is increased eddy current loss will remain unchanged.

14 . The power factor in a transformer depend on the power factor of the load.

15 . At no load the current taken by the transformer lag behind the applies voltage by 80

16 . The efficiency of a transformer does not depends on power factor

17 . If the secondary of a 1:10 step up transformer is connected to the primary of a 1:5 step up transformer then the total transformer ratio will be 50

18 . 10 KVA , 100 Hz transformer will be smallest in size.

19 . A short circuit test on a transformer gives copper losses at full load.

20 . Leakage flux in a transformer may be minimized by sectionalizing and interleaving the primary and secondary windings.