Which of the following is not a part of transformer installation ?
Which of the following is not a part of transformer installation ? A. Conservator B. Breather C. Buchholz relay D. Exciter
Which of the following is not a part of transformer installation ? A. Conservator B. Breather C. Buchholz relay D. Exciter
The purpose of providing an iron core in a transformer is to_____________? A. provide support to windings B. reduce hysteresis loss C. decrease the reluctance of the magnetic path D. reduce eddy current losses
No-load current in a transformer________________? A. lags behind the voltage by about 75° B. leads the voltage by about 75° C. lags behind the voltage by about 15° D. leads the voltage by about 15°
The efficiency of a transformer will be maximum when_____________? A. copper losses = hysteresis losses B. hysteresis losses = eddy current losses C. eddy current losses = copper losses D. copper losses = iron losses
The permissible flux density in case of cold rolled grain oriented steel is around__________? A. 1.7 Wb/m2 B. 2.7 Wb/m2 C. 3.7 Wb/m2 D. 4.7 Wb/m2
Sumpner’s test is conducted on transformers to determine_____________? A. temperature B. stray losses C. all-day efficiency D. none of the above
The dielectric strength of transformer oil is expected to be______________? A. lkV B. 33 kV C. 100 kV D. 330 kV
No-load on a transformer is carried out to determine______________? A. copper loss B. magnetising current C. magnetising current and loss D. efficiency of the transformer
The path of a magnetic flux in a transformer should have______________? A. high resistance B. high reluctance C. low resistanceD. low reluctance
The no-load current drawn by transformer is usually what per cent of the full-load current ? A. 0.2 to 0.5 per cent B. 2 to 5 per cent C. 12 to 15 per cent D. 20 to 30 per cent