A) Autotransformer B) Potential transformer C) Current transformer D) Step up transformer. Ans : (A)
A) 5.8 : 1 B) 10 : 1 C) 12.1 : 1 D) 17.2 : 1. Ans : (B)
A) Lags the applied voltage by 90° B) Leads the applied voltage by 90° C) Leads the applied voltage some what less than 90° D) Lags the applied voltage by some what less than 90°. Ans : (D)
A) 100 W B) 300 W C) 400 W D) 500 W. Ans : (B)
A) lagging B) unity C) leading D) zero. Ans : (C)
A) poor power factor B) high fixed loss in comparison to the output C) small secondary output D) small copper losses. Ans : (B)
A) 2.5 % B) 1.0 % C) Zero D) - 2.5 %. Ans : (D)
A) Iron becomes fully saturated B) The power factor is high C) The current on the low voltage side is very small D) The voltage applied across the high voltage side is a fraction of its rated voltage and so is the mutual flux. Ans : (D)
A) Low no load current B) Low primary winding resistance C) Open circuit secondary D) Magnetizing reactance of the transformer. Ans : (D)
A) Core loss B) Copper loss C) Hysteresis loss D) Eddy current loss. Ans : (A)