65551. Switching regulator efficiencies can be greater than ________ percent.
65552. The 7912 regulator IC provides ________ .
65553. If a peak rectified voltage for the full-wave filter circuit is 40 V, calculate the filter dc voltage if C = 75 F and load current is 40 mA.
65554. What is the typical dropout voltage for the 7812 fixed positive voltage regulator?
65555. What is the ratio of the period of the output voltage to the period of the input voltage in a full-wave rectifier?
65556. If the value of full-load voltage is the same as the no-load voltage, the voltage regulation calculated is ________ %, which is the best expected.
65557. Calculate the ripple of a filter output having a 20-V dc component and a 1.7 Vr(rms) ac component.
65558. A voltage regulator has a no-load output of 18 V and a full-load output of 17.3 V. The percent load regulation is
65559. A switching regulator that is configured as a voltage-inverter produces what type of output?
65560. Refer to the given figure. This circuit is called
65561. In Figure 17-1(a)(see question 6), the purpose of R1 is to
65562. For a full-wave rectifier with ac ripple at 120 Hz, the impedance of a capacitor can be calculated using XC = ________.
65563. What is the purpose of an additional RC filter section in a power supply circuit?
65564. In which period is the capacitor filter charged in a full-wave rectifier?
65565. In this improved series regulator circuit, which of the following components is the sampling circuit?
65566. The ________ regulator is less efficient than the ________ type, but offers inherent short-circuit protection.
65567. In which of the following applications is a pulsating dc voltage suitable?
65568. Refer to the given figure. If the output of the circuit were to be a short circuit, what power rating would R1 need to have?
65569. The purpose of the added RC section is to pass most of the dc component while reducing as much of the ac component as possible.
65570. In a series regulator, what is the purpose of fold-back limiting?
65571. Refer to the given figure. The purpose for the zener diode D1 is
65572. In a simple series regulator circuit, which of the following components is the controlling element?
65573. Calculate the dc voltage across a 2-k load for an RC filter section (R = 50 , C = 20 F). The dc voltage across the initial filter capacitor is Vdc = 50 V.
65574. Refer to the given figure. If the load is short-circuited, what would be the maximum current through R1?
65575. In an improved shunt regulator, which of the following components sets the reference voltage?
65576. ________ regulation can be defined as the percentage change in the output voltage for a given change in load current.
65577. How many diodes conduct in the full-wave bridge rectifier while the capacitor is being charged?
65578. Refer to the given figure. If a solder splash shorted the ends of R1 to each other,
65579. Calculate the ripple of a capacitor filter for a peak rectified voltage of 40 V, a capacitor value C = 75 F, and a load current of 40 mA.
65580. How many terminals does a 7800 series IC regulator have?
65581. What are the typical values of Vref and Iadj for the LM317 adjustable voltage regulator?
65582. In this op-amp series regulator circuit, which of the following components is the comparator circuit?
65583. Which component(s) set(s) the voltage across the load in a basic transistor shunt regulator?
65584. Voltage regulation requires
65585. Across which of the following components of a power supply does the average (dc) voltage exist?
65586. Switching regulators are more efficient than linear regulators and are particularly useful in ________-voltage, ________-current applications.
65587. For what range of load current can voltage regulators be selected for operation?
65588. The 7905 regulator IC provides ________.
65589. What type of regulator offers inherent short-circuit protection?
65590. Refer to the given figure. The inductor and capacitor are used for
65591. Refer to the given figure. If the BE junction of Q1 opens, the output voltage VOUT will
65592. This circuit is an example of the ac equivalent of an RC filter.
65593. Refer to the given figure. If the output voltage tends to decrease due to an increase in load current, the transistor will conduct for ________ time each cycle.
65594. The larger the value of the capacitor, the smaller the peak current drawn through the rectifying diodes.
65595. In a shunt linear regulator, the control element is a(n) ________ in parallel with the load.
65596. For what range of fixed regulated voltages do the series 78xx regulators provide regulation?
65597. In a series linear regulator, the control element is a(n) ________ in series with the load.
65598. What regulated output voltage is provided for the following circuit elements: R1 = 15 k, R2 = 35 k, and VZ = 11.2 V?
65599. ________ regulation can be defined as the percentage change in the output voltage for a given change in the input voltage.
65600. A ________ -wave rectified signal has less ripple than a ________ -wave rectified signal and is thus better to apply to a filter.
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