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.