a) Decrease reluctance of the common magnetic circuit b) Decrease iron losses c) Prevent hysteresis loses d) Prevent eddy current losses Ans: (a)
a) Self induction b) Mutual induction c) Faraday’s law of electromagnetic induction d) Self and mutual induction both Ans: (d)
a) Work b) Burn the winding c) Not work d) Give lower voltage on the secondary side Ans: (b)
a) Transformer oil of high breakdown voltage b) Winding material of high resistivity c) High reluctance magnetic core d) Low reluctance magnetic core Ans: (d)
a) Open iron core b) Air core c) Closed iron core d) None of these Ans: (b)
a) Insulation and cooling b) Cooling and lubrication c) Lubrication and insulation d) Insulation, cooling and lubrication Ans: (a)
a) Attain adhesion between the lamination b) Prevent corrosion of laminations c) Decrease the hum d) Insulate the lamination from each other Ans: (d)
a) Antiphase with each other b) In phase with each other c) Equal in magnitude d) Determined by load on transformer secondary Ans: (b)
a) Current b) Frequency c) Voltage d) Power Ans: (c)
a) Reducing the air gap in the magnetic circuit b) Reducing the thickness of lami-nations c) Increasing the thickness of lami-nations d) Increasing the gap in the magnetic circuit Ans: (b)