engineering recuitment GATE EE 2023-24 Test Series Power Electronics and Drives Choppers Step Down Choppers
A step down chopper operates from a D.C. voltage source Vs = 400 V and feeds a DC motor armature with a back emf Eb = 300 V. From the oscilloscope traces it is found that the current rises for a time tr = 10 m sec and falls to zero over time tf = 5 m sec and remains zero for a time of t0 = 6 m sec in every chopping cycle. Then, average DC voltage across the freewheeling diode will be
1
276 V
2
257 V
3
262 V
4
300 V