Transformers - Study Mode

[#86] In a transformer the resistance between its primary and secondary should be
Correct Answer

(D) Infinity

[#87] Gas is usually not liberated due to dissociation of transformer oil unless the oil temperature exceeds
Correct Answer

(D) 150°C

[#88] For given applied voltage, with the increase in frequency of the applied voltage
Correct Answer

(B) eddy current loss will increase

Explanation

Solution: Eddy current loss in transformers is proportional to the square of the frequency of the applied voltage. As the frequency of the applied voltage increases, eddy current loss increases . This is because higher frequencies induce greater eddy currents in the core material, leading to increased power loss. Therefore, with an increase in the frequency of the applied voltage, Option B correctly describes that eddy current loss will increase.

[#89] In an actual transformer the iron loss remains practically constant from noload to fullload because
Correct Answer

(C) core flux remains practically constant

[#90] The chemical used in breather is
Correct Answer

(D) silica gel