A step-up chopper is used to feed a load at 400 V dc fr om a 250 V dc source. The inductor current is continuous. If the off time of the switch is 20 s, the switching frequency of the chopper in kHz is _____.

A step-up chopper is used to feed a load at 400 V dc fr om a 250 V dc

1.	A step-up chopper is used to feed a load at 400 V dc fr om a 250 V dc source. The inductor current is continuous. If the off time of the switch is 20 s, the switching frequency of the chopper in kHz is _____.
A.	32.5
B.	21.5
C.	31.0 to 31.5
D.	31.0
Answer» D. 31.0

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A step-up chopper is used to feed a load at 400 V dc fr om a 250 V dc source. The inductor current is continuous. If the off time of the switch is 20 s, the switching frequency of the chopper in kHz is _____.

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