A) 5 : 1 B) 4 : 1 C) 3 : 1 D) 2 : 1. Ans : (C)
A) Magnetizing component of Io is large B) Magnetizing component of Io is small C) Iron loss component of Io is large D) Copper losses are high. Ans : (A)
A) Critical value B) RMS value C) Average value D) Maximum value. Ans : (D)
A) friction loss B) core loss C) hysteresis loss D) eddy current loss. Ans : (A)
A) Both will have identical cost B) Three phase transformer C) Three transformers each of the single phase type D) None of the above. Ans : (C)
A) high voltage side B) low voltage side C) secondary side D) primary side. Ans : (A)
A) both transformers will operate at 0.8 p.f. lagging B) both transformers will have identical losses at full load C) the regulation of transformer T1 will be better than that of transformer T2 D) the weight of transformer T1 will be more than that of transformer T2. Ans : (D)
A) both transformers will operate at identical power factor B) one of the transformers will operate at p.f. more than 0.8 lagging and other will operate at p.f. less than 0.8 lagging C) both transformers will operate at power factor less than 0.8 lagging D) both transformers will operate at power factor more than 0.8 lagging. Ans : (A)
A) There is no saturation of core B) There is no leakage flux C) The resistance of the winding is negligible D) All of the above. Ans : (B)
A) E2/E1 B) E1/E2 C) I2/I1 D) N1/N2. Ans : (B)