The thickness of laminations used in a transformer is usually 0.4 mm to 0.5 mm.
Answer : The transformer laminations are insulated from each other by thin coat of varnish.
Answer : Silicon steel used in laminations mainly reduces hysteresis loss.
Answer : Material used for construction of transformer core is usually silicon steel.
Answer : The core used in high frequency transformer is usually air core .
Answer : The transformer ratings are usually expressed in terms of kVA.