SSC JE Electrical Engineering 2012
For the following questions answer them individually
A coil with a certain number of turns has a specified time constant. If the number of turns is doubled, its time constant would
The iron loss per unit frequency in a ferromagnetic core, when plotted against frequency, is a
The mutual inductance between two closely coupled coils is 1 H. If the turns of one coil is decreased to half and those of the other is doubled, the new value of the mutual inductance would be
Following graph shows the loss characteristics of a sheet of ferromagnetic material against varying frequency f. $$P_i$$ is the iron loss at frequency f, Hysteresis and eddy current losses of the sheet at 100 Hz are
Two inductors have self inductances of 9 mH and 25 mH. The mutual inductance between the two is 12 mH. The coefficient of inductive coupling between the two inductors is
