341. In a transformer the energy is conveyed from primary to secondary_________?
A. through cooling coil
B. through air
C. by the flux
D. none of the above
342. A transformer core is laminated to__________?
A. reduce hysteresis loss
B. reduce eddy current losses
C. reduce copper losses
D. reduce all above losses
343. The degree of mechanical vibrations produced by the laminations of a transformer depends on____________?
A. tightness of clamping
B. gauge of laminations
C. size of laminations
D. all of the above
344. 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
345. The path of a magnetic flux in a transformer should have______________?
A. high resistance
B. high reluctance
C. low resistance
D. low reluctance
346. 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
347. The dielectric strength of transformer oil is expected to be______________?
A. lkV
B. 33 kV
C. 100 kV
D. 330 kV
348. Sumpner’s test is conducted on transformers to determine_____________?
A. temperature
B. stray losses
C. all-day efficiency
D. none of the above
349. 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
350. 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
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