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MCQs 1: Which of the following is not a part of transformer installation ?

Conservator Breather Buchholz relay Exciter
Answer Explanation

MCQs 2: The purpose of providing an iron core in a transformer is to_____________?

provide support to windings reduce hysteresis loss decrease the reluctance of the magnetic path reduce eddy current losses
Answer Explanation

MCQs 3: No-load current in a transformer________________?

lags behind the voltage by about 75° leads the voltage by about 75° lags behind the voltage by about 15° leads the voltage by about 15°
Answer Explanation

MCQs 4: The efficiency of a transformer will be maximum when_____________?

copper losses = hysteresis losses hysteresis losses = eddy current losses eddy current losses = copper losses copper losses = iron losses
Answer Explanation

MCQs 5: The permissible flux density in case of cold rolled grain oriented steel is around__________?

1.7 Wb/m2 2.7 Wb/m2 3.7 Wb/m2 4.7 Wb/m2
Answer Explanation

MCQs 6: Sumpner’s test is conducted on transformers to determine_____________?

temperature stray losses all-day efficiency none of the above
Answer Explanation

MCQs 7: The dielectric strength of transformer oil is expected to be______________?

lkV 33 kV 100 kV 330 kV
Answer Explanation

MCQs 8: No-load on a transformer is carried out to determine______________?

copper loss magnetising current magnetising current and loss efficiency of the transformer
Answer Explanation

MCQs 9: The path of a magnetic flux in a transformer should have______________?

high resistance high reluctance low resistance low reluctance
Answer Explanation

MCQs 10: The no-load current drawn by transformer is usually what per cent of the full-load current ?

0.2 to 0.5 per cent 2 to 5 per cent 12 to 15 per cent 20 to 30 per cent
Answer Explanation

MCQs 11: The degree of mechanical vibrations produced by the laminations of a transformer depends on____________?

tightness of clamping gauge of laminations size of laminations all of the above
Answer Explanation

MCQs 12: A transformer core is laminated to__________?

reduce hysteresis loss reduce eddy current losses reduce copper losses reduce all above losses
Answer Explanation

MCQs 13: In a transformer the energy is conveyed from primary to secondary_________?

through cooling coil through air by the flux none of the above
Answer Explanation

MCQs 14: Which of the following does not change in a transformer ?

Current Voltage Frequency All of the above
Answer Explanation

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