A full wave center-tapped  transformer rectifier in a power supply provides an average dc output voltage of 14V on which a maximum ripple of  ±0.5 volt is allowed. Diodes have a 0.7 Volt drop when conducting. Assuming a resistive load of 120 ohm, a line voltage of 120V rms @ 60Hz through a transformer,

(a) Sketch the circuit diagram for the rectifier                                                 

(b) What is the rms voltage across the transformer secondary?                       

(c) Determine the size of filter capacitor required                                           

(d) Assuming 50% safety margin, what diode PIV rating is appropriate?