a) Not be effected b) Increase c) Decrease d) Be the sum of no-load current and excess current drawn due to the secondary current Ans: (d)
a) Magnetically b) Physically c) Electromagnetically d) Electrically Ans: (a)
a) Always at unity power factor b) Has its own constant power factor c) At a power factor always below 0.8 d) At power factor depending on the power factor of the load Ans: (d)
a) Secondary induced emf b) Primary induced emf c) Drop across resistance and reac-tance d) The secondary voltage Ans: (a)
a) 1 to 3% b) 3 to 10% c) 10 to 20% d) 20 to 30% Ans: (a)
a) High voltage winding of small rating transformer b) Low voltage winding of small rating transformer c) High voltage winding rating of large transformer d) Low voltage winding of large rating transformer Ans: (a)
a) Fine variation of voltage b) Ease of operation c) Reduction in number of bearings d) Better regulation Ans: (c)
a) Reduce copper loss b) Increase the size of transformer c) Provide better cooling d) Reduce iron loss in yoke and magnetizing current Ans: (d)
a) Copper wire of same diameter b) Common magnetic circuit c) Different number of turns d) Separate magnetic circuits Ans: (b)
a) The flux which is linked with both the primary and the secondary windings b) The flux which is linked either only with the primary or only with the secondary c) The flux whose path is exclusively through the air d) None of these Ans: (b)