86. If a peak rectified voltage for the full-wave filter circuit is 40 V, calculate the filter dc voltage if C = 75 μF and load current is 40 mA.
(a) 27.9 V
(b) 32.12 V
(c) 37.78 V
(d) 40 V
87. What is the ratio of the peak ripple voltage level to its rms voltage level?
(a) √3
(b) √2
(c) √3/2
(d) √2/2
88. In which of the following applications is a pulsating dc voltage suitable?
(a) Battery charger
(b) Radio
(c) Stereo system
(d) Computer
89. Calculate the voltage regulation of a power supply having VNL = 50 V and VFL = 48 V.
(a) 4.17%
(b) 5.2%
(c) 6.2%
(d) 7.1%
90. Calculate the ripple of a filter output having a 20-V dc component and a 1.7 Vr(rms) ac component.
(a) 6%
(b) 8.5%
(c) 85%
(d) 58%
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