Transformers Mcqs
Q.1: Which of the following does not change in a transformer ?9
A. Current
B. Voltage
C. Frequency
D. All of the above
Q.2: In a transformer the energy is conveyed from primary to secondary_________?K
A. through cooling coil
B. through air
C. by the flux
D. none of the above
Q.3: A transformer core is laminated to__________?-
A. reduce hysteresis loss
B. reduce eddy current losses
C. reduce copper losses
D. reduce all above losses
Q.4: The degree of mechanical vibrations produced by the laminations of a transformer depends on____________?h
A. tightness of clamping
B. gauge of laminations
C. size of laminations
D. all of the above
Q.5: 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
Q.6: The path of a magnetic flux in a transformer should have______________?G
A. high resistance
B. high reluctance
C. low resistance
D. low reluctance
Q.7: No-load on a transformer is carried out to determine______________?C
A. copper loss
B. magnetising current
C. magnetising current and loss
D. efficiency of the transformer
Q.8: The dielectric strength of transformer oil is expected to be______________?K
A. lkV
B. 33 kV
C. 100 kV
D. 330 kV
Q.9: Sumpners test is conducted on transformers to determine_____________?H
A. temperature
B. stray losses
C. all-day efficiency
D. none of the above
Q.10: 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

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