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Answer :

Gas is usually not liberated due to dissociation of transformer oil unless the oil temperature exceeds 150°C.

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Description : 76 The changes in volume of transformer cooling oil due to variation of atmospeheric temperature during day and night is taken care of by which part of transformer? A. Conservator B. Breather C. Bushings D. Buchholz relay

Answer : A. Conservator

Description : 45 The function of conservator in a transformer is A. To protect against internal fault B. To reduce copper as well as core losses C. To cool the transformer oil D. To take care of the expansion and contraction of transformer oil due to variation of temperature of surroundings

Answer : D. To take care of the expansion and contraction of transformer oil due to variation of temperature of surroundings

Answer : The transformer ratings are usually expressed in terms of kVA.

Answer : Material used for construction of transformer core is usually silicon steel.

Answer : The thickness of laminations used in a transformer is usually 0.4 mm to 0.5 mm.