Electrical Engineering: Circuit theory MCQ

The equivalent impedance Zeq for the infinite ladder circuit shown in the figure is

A DC voltage source is connected to a series L-C circuit by turning on the switch S at time t = 0 as shown in the figure. Assume i (0) = 0, v (0) = 0 . Which one of the following circular loci represents the plot of i ( t ) versus v ( t ) ?

For the balanced Y-Y connected 3-phase circuit shown in the figure below, the line-line voltage is 208 V rms and the total power absorbed by the load is 432 W at a power factor of 0.6 leading.

For the network given in figure below, the Thevenin’s voltage Vab is

The output y(t) of the following system is to be sampled, so as to reconstruct it from its samples uniquely. The required minimum sampling rate is