1. A power transformer is a constant
2. The thickness of a 50 Hz transformer lamination is
3. The full-load efficiency of a transformer at 0.85 p.f. lag is 97 per cent. Its efficiency at full load 0.85 bpower factor lead will be
4. Transfer of electrical power from primary to secondary in a transformer takes place
5. Transformer humming sound is reduced by the
6. The voltage regulation of a transformer at full-load 0.8 power factor lag is 6 per cent. Its voltage regulation at full-load 0.8 power factor lead will be
7. If 110 per cent of normal voltage and 110 per cent of normal frequency is applied to a transformer, the percentage change of eddy current losses will be
8. If 90 per cent of normal voltage and 90 per cent of normal frequency are applied to a transformer, the per cent charge in hysteresis losses will be
9. The required thickness of lamination in a transformer decreases when
10. Oil in transformer is used to
Question 1 of 10