Question

For a single phase half wave rectifier, the rectifier efficiency is always constant & it is

(a) 4/π^2

(b) 8/π^2

(c) 100

(d) 2/π^2

I got this question in an interview for internship.

Origin of the question is 1P-Diode Rectifier HW-2 in section Diode Rectifiers of Power Electronics

Answer 1

Right choice is (a) 4/π^2

To elaborate: Rectifier efficiency = Pdc/Pac

Pdc = (Vm x Im)/π^2

Pac = 4/(Vm x Im).