Description : can inductors have resistance?
Answer : Yesss every inductor has resistance ... Because it is also made up of good conductor have some value of resistance practicaly But ideal inductor has resistance is zero
Description : An air core transformer has primary and secondary inductors of 8mH and 10 mH respectively. The mutual inductance is 5mH. The coefficient of coupling is A) 1/8 B) 1/6 C) ¼ D) ½
Description : The output of SR flip flop when S=1, R=0 is (A) 1 (B) 0 (C) No change (D) High impedance
Answer : Ans: A As for the SR flip-flop S=set input R=reset input ,when S=1, R=0, Flip-flop will be set.
Description : Maximum power is transferred when load impedance is A) equal to source impedance B) equal to half of the source impedance C) equal to zero D) none of the above
Description : The line trap unit employed in carrier current relaying: (A) offers high impedance to 50 Hz power frequency signal (B) offers high impedance to carrier frequency signal (C) offers low impedance to carrier frequency signal (D) Both (A) & (C)
Answer : Ans: B The line trap unit employed in carrier current relaying offers high impedance to carrier frequency signal. Because carrier frequency range is 35 km – 500 kHz XL = 2Π f l Where f increases XL will also increases