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Answer :

The transformer laminations are insulated from each other by thin coat of varnish.

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Answer : In a power or distribution transformer about 10 percent end turns are heavily insulated to withstand the high voltage drop due to line surge produced by the shunting capacitance of the end turns.

Description : 77 The transformer laminations are insulated from each other by A. Mica strip B. Thin coat of varnish C. Paper D. Any of the above

Answer : B. Thin coat of varnish

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

Description : 19 Transformer cores are built up from laminations rather than from solid metal so that A. Oil penetrates the core more easily B. Eddy current loss is reduced C. Less lamination is required for the windings D. Turn ratio is higher than voltage ratio

Answer : B. Eddy current loss is reduced

Answer : Silicon steel used in laminations mainly reduces hysteresis loss.