a) sulphur b) odour c) moisture d) both (a) and (c) Ans: (d)
a) increasing the number of turns b) using soft material for winding c) using magnetic core of low reluc-tance d) using transformer oil better quality Ans: (c)
a) the frequency the secondary winding voltage increases b) waveshape of the secondary winding voltage gets distorted c) size of the transformer can be reduced d) eddy current losses increase Ans: (c)
a) is always unit b) is always leading c) is always lagging d) depends on the power factor of load Ans: (d)
a) 1 kVA, 50 Hz b) 1 KVA, 60 Hz c) 1KVA, 100Hz d) 1KVA, 500 Hz Ans: (d)
a) Current b) Voltage c) Frequency d) Both voltage and current Ans: (d)
a) Waveform b) Frequency c) Voltage d) Both frequency and waveform Ans: (d)
a) High reluctance b) High conductivity c) Low reluctance d) Low conductivity Ans: (c)
a) A.C b) D.C c) Both a.c. and d.c. d) Pulsating d.c. Ans: (a)
a) A common core for its primary and secondary winding b) Core of stainless steel and winding of pure copper wire c) No losses and magnetic leakage d) Interleaved primary and secondary windings Ans: (c)