SSC JE Electrical Engineering 2012
For the following questions answer them individually
SSC JE Electrical Engineering 2012 - Question 111
A coil with a certain number of turns has a specified time constant. If the number of turns is doubled, its time constant would
SSC JE Electrical Engineering 2012 - Question 112
The iron loss per unit frequency in a ferromagnetic core, when plotted against frequency, is a
SSC JE Electrical Engineering 2012 - Question 113
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
SSC JE Electrical Engineering 2012 - Question 114
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
SSC JE Electrical Engineering 2012 - Question 115
Hysteresis losses are present in iron core coil when
SSC JE Electrical Engineering 2012 - Question 116
Eddy current loss in ferromagnetic core is proportional to
SSC JE Electrical Engineering 2012 - Question 117
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
SSC JE Electrical Engineering 2012 - Question 118
The magnetic materials that are used to prepare permanent magnets should have
SSC JE Electrical Engineering 2012 - Question 119
Poles of dc machines are often laminated to reduce
