Chapter Questions
What is the ripple factor of a sinusoidal signal having peak ripple of $2 \mathrm{~V}$ on an average of $50 \mathrm{~V}$ ?
A filter circuit provides an output of $28 \mathrm{~V}$ unloaded and $25 \mathrm{~V}$ under full-load operation. Calculate the percentage voltage regulation.
A half-wave rectifier develops $20 \mathrm{~V}$ dc. What is the value of the ripple voltage?
What is the rms ripple voltage of a full-wave rectifier with output voltage $8 \mathrm{~V} \mathrm{dc}$ ?
A simple capacitor filter fed by a full-wave rectifier develops $14.5 \mathrm{~V} \mathrm{dc}$ at $8.5 \%$ ripple factor. What is the output ripple voltage (rms)?
A full-wave rectified signal of $18 \mathrm{~V}$ peak is fed into a capacitor filter. What is the voltage regulation of the filter if the output is $17 \mathrm{~V} \mathrm{dc}$ at full load?
A full-wave rectified voltage of $18 \mathrm{~V}$ peak is connected to a $400-\mu \mathrm{F}$ filter capacitor. What are the ripple and dc voltages across the capacitor at a load of $100 \mathrm{~mA}$ ?
A full-wave rectifier operating from the 60 -Hz ac supply produces a 20-V peak rectified voltage. If a $200-\mu \mathrm{F}$ capacitor is used, calculate the ripple at a load of $120 \mathrm{~mA}$.
A full-wave rectifier (operating from a 60-Hz supply) drives a capacitor-filter circuit $(C=100 \mu \mathrm{F})$, which develops $12 \mathrm{~V}$ dc when connected to a $2.5-\mathrm{k} \Omega$ load. Calculate the output voltage ripple.
Calculate the size of the filter capacitor needed to obtain a filtered voltage having $15 \%$ ripple at a load of $150 \mathrm{~mA}$. The full-wave rectified voltage is $24 \mathrm{~V}$ dc, and the supply is $60 \mathrm{~Hz}$.
A $500-\mu \mathrm{F}$ capacitor provides a load current of $200 \mathrm{~mA}$ at $8 \%$ ripple. Calculate the peak rectified voltage obtained from the 60 -Hz supply and the dc voltage across the filter capacitor.
Calculate the size of the filter capacitor needed to obtain a filtered voltage with $7 \%$ ripple at a load of $200 \mathrm{~mA}$. The full-wave rectified voltage is $30 \mathrm{~V} \mathrm{dc}$ and the supply is $60 \mathrm{~Hz}$.
Calculate the percentage ripple for the voltage developed across a $120-\mu \mathrm{F}$ filter capacitor when providing a load current of $80 \mathrm{~mA}$. The full-wave rectifier operating from the $60-\mathrm{Hz}$ supply develops a peak rectified voltage of $25 \mathrm{~V}$.
An $R C$ filter stage is added after a capacitor filter to reduce the percentage of ripple to $2 \%$. Calculate the ripple voltage at the output of the $R C$ filter stage providing $80 \mathrm{~V}$ dc.
An $R C$ filter stage $(R=33 \Omega, C=120 \mu \mathrm{F})$ is used to filter a signal of $24 \mathrm{~V} \mathrm{dc}$ with $2 \mathrm{~V} \mathrm{rms}$ POWERoperating from a full-wave rectifier. Calculate the percentage ripple at the output of the $R C$ section for a 100 -mA load. Also calculate the ripple of the filtered signal applied to the $R C$ stage.
A simple capacitor filter has an input of $40 \mathrm{~V}$ dc. If this voltage is fed through an $R C$ filter section $(R=50 \Omega, C=40 \mu \mathrm{F})$, what is the load current for a load resistance of $500 \Omega$ ?
Calculate the rms ripple voltage at the output of an $R C$ filter section that feeds a $1-\mathrm{k} \Omega$ load when the filter input is $50 \mathrm{~V}$ dc with $2.5$ - $\mathrm{V}$ rms ripple from a full-wave rectifier and capacitor filter. The $R C$ filter section components are $R=100 \Omega$ and $C=100 \mu \mathrm{F}$.
If the no-load output voltage for Problem 17 is $50 \mathrm{~V}$, calculate the percentage voltage regulation with a $1-\mathrm{k} \Omega$ load.
Calculate the output voltage and Zener diode current in the regulator circuit of Fig. $42 .$
What regulated output voltage results in the circuit of Fig. 43 ?
Calculate the regulated output voltage in the circuit of Fig. $44 .$
Determine the regulated voltage and circuit currents for the shunt regulator of Fig. 45 .
Draw the circuit of a voltage supply comprised of a full-wave bridge rectifier, capacitor filter, and IC regulator to provide an output of $+12 \mathrm{~V}$.
Calculate the minimum input voltage of the full-wave rectifier and filter capacitor network in Fig. 46 when connected to a load drawing $250 \mathrm{~mA}$.
Determine the maximum value of load current at which regulation is maintained for the circuit of Fig. 47 .
Determine the regulated voltage in the circuit of Fig. 30 with $R_{1}=240 \Omega$ and $R_{2}=1.8 \mathrm{k} \Omega$.
Determine the regulated output voltage from the circuit of Fig. 48 .
Modify the circuit of Fig. 38 to include a load resistor $R_{L}$. Keeping the input voltage fixed at 10 $\mathrm{V}$, do a sweep of the load resistor from $100 \Omega$ to $20 \mathrm{k} \Omega$, showing the output voltage using Probe.
For the circuit of Fig. 40, do a sweep showing the output voltage for $R_{L}$ varied from $5 \mathrm{k} \Omega$ to 20 $\mathrm{k} \Omega$
Run a PSpice analysis of the circuit of Fig. 19 for $V_{Z}=4.7 \mathrm{~V}$ and beta $\left(Q_{1}\right)=$ beta $\left(Q_{2}\right)=100$, and vary $V_{i}$ from $5 \mathrm{~V}$ to $20 \mathrm{~V}$.