a) Low permeability b) High hysteresis c) High resistance d) All of these Ans: (c)
a) Avoid high voltage insulation b) Avoid saturation of core c) Protect the primary circuit d) Provide safety to human beings Ans: (b)
a) Oil leakage b) Excessive heating c) Travelling wave surges on distri-bution lines d) None of these Ans: (c)
a) Draws sufficiently large no-load current for convenient reading b) Requires least voltage to perform the test c) Needs minimum power input d) Has become customary Ans: (a)
a) LV side and HV side respectively b) HV side and LV side respectively c) HV side only d) LV side only Ans: (b)
a) Efficiency b) Rating c) Leakage reactance d) Per unit impedance Ans: (d)
a) Open circuit b) Short circuit c) Regeneration of power d) Load sharing proportional to their kVA rating Ans: (b)
a) They should have zero impedance b) Their phases should be the same c) They should have equal turns ratio d) None of these Ans: (c)
a) Magnetic flux b) Leakage flux c) Magnetomotive force d) Electromotive force Ans: (b)
a)Remain same. b) Be directly proportional to secondary current c) Be directly proportional to the current drawn by primary winding d) None of these Ans: (a)