In a 230 V, 50 Hz single-phase SCR bridge converter operating at a firing delay angle, α and with large R-L load, the input source current is
(A) sinusoidal current (B) constant dc current
(C) continuous rectangular pulses (D) alternating rectangular pulses
(A) sinusoidal current (B) constant dc current
(C) continuous rectangular pulses (D) alternating rectangular pulses