Q.

Due to centre tap Vm=400/2=200) IRMS=198/√2=140mA, IAVG=2*198/ π=126mA. ϒ=[(140/126)2-1]1/2=0.48. So, ϒ=48%.

A. 0.623
B. 0.678
C. 0.693
D. 0.625
Answer» C. 0.693
Explanation: transformer utilisation factor is the ratio of ac power delivered to load to the dc power rating. this factor indicates effectiveness of transformer usage by rectifier. for a half wave rectifier, it’s low and equal to 0.693.
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