a) Less than the weight of copper b) Greater than the weight of copper c) Equal to the weight of copper d) None of these Ans: (c)
a) High value of reactance b) A movable secondary winding c) A high value of resistance d) Primary and secondary windings surround-ding the core Ans: (c)
a) The magnetizing current increases and the core loss components decreases b) The magnetizing component decreases and the core loss components increases c) Both the magnetizing and core loss components decrease d) Both the magnetizing and core loss components increase Ans: (c)
a) Frequency alone b)Voltage alone c) Thickness of lamination d) All of these Ans: (d)
a) Load current alone b) Power factor of load alone c) Both (a) and (b) d) Supply frequency Ans: (c)
a) A little more than full load b) Near full load c) Half load d) Quarter load Ans: (c)
a) Efficiency b) Capacity c) Voltage ratio d) Polarity Ans: (d)
a) Conduction process alone b) Induction process alone c) Both conduction and induction processes d) Mutual coupling Ans: (c)
a) The kVA rating gets reduced b) The kVA rating gets increased considerably c) The kVA rating remain unchanged d) None of these Ans: (b)
a) Is used only one winding b) Core losses are reduced c) It needs no cooling d) It has simple construction Ans: (a)