1131. The power factor of a transformer on no-load is poor due to :
A. Magnetizing reactance of the transformer *
B. Open-circuited secondary
C. Low primary winding resistance
D. Low no-load current
1132. Essential twisting of transformer contains two indistinguishable windings in equal. Assuming one winding is eliminated, polarizing current will be :
A. Balved
B. The same
C. Doubled*
D. Increased four times
1133. The center motion of a pragmatic transformer with an obstruction load:
A. Is totally consistent with load changes *
B. Increases linearly with load
C. Increases as the square root of the load
D. Decreases with increase of load
1134. The inductive reactance of a transformer depends on:
A. Electromotive force
B. Magnetomotive force
C. Magnetic flux
D. Leakage flux *
1135. The flux in transformer core:
A. Increases with load
B. Remain constant irrespective of load *
C. Decreases with load
D. None of the above
1136. The mutual flux in a loaded transformer can be varied by braying :
A. Primary current
B. Load impdance
C. Secondary current
D. Reluctance of the magnetic path *
1137. The primary ampere-turns are counter balanced by :
A. Secondary ampere turns *
B. Primary flux
C. Increase in mutual flux
D. Increase in secondary current
1138. In a transformer _______ decrease with the increase in leakage flux :
A. Primary induced emf
B. Secondary induced emf
C. Secondary terminal voltage *
D. None of the above
1139. Power transformed from primary to secondary depends upon:
A. Number of primary turns
B. Number of secondary turns
C. Current transformation ratio
D. Attractive coupling among essential and auxiliary windings *
1140. A transformer is providing unadulterated resistive (solidarity pf) load. The power factor on essential side will be :
A. 0.95 (Lead)
B. About 0.95 (lag) *
C. Zero
D. Unity