The coils are most likely used, in conjunction with the capacitor to form a low pass filter to keep high frequency noise out of the cuircuits that are "downstream". The required value of L depends on the amount of attenuation you need at a particular frequency of interest. The value can be found using AC circuit analysis. The resistors are "Q spoilers" to prevent high circulating current from flowing at the LC resonant frequency. Respond if you need the equation for L vs F, Attenuation. I'll figure it out when I get time.