Voltage Regulators Question & AnswersJune 5, 2021 By WatElectronics This article lists 100 Voltage Regulator MCQs for engineering students. All the Voltage Regulator Questions & Answers given below includes solution and link wherever possible to the relevant topic.A voltage regulator is a combination of elements designed to ensure that the output voltage of a supply remains constant. The technical block diagram of any power supply consists of a rectifier, filter, and regulator. First of all the input voltage is scaled down using the step-down transformer and then that voltage converted into pulsating dc using a rectifier and the variation in pulsating dc is filtered out using the filter circuit and if you see the output of the filter circuit then that output still contains some amount of ripple, so the filtered output is then given to the regulator to remove the variations and provide the constant output.The line and load regulation are these two important parameters of the power supply, and these two parameters define how well the power supply can provide the constant output voltage even if there is a change in the line or load voltage. 1). When load varies __________ voltage regulation maintains constant output voltageLineLoadBoth a and bNone of the aboveHintWhen load varies load voltage regulation maintains the constant output voltage 2). When input voltage varies __________ voltage regulation maintains the constant output voltageLineLoadBoth a and bNone of the aboveHintWhen input voltage varies line voltage regulation maintains the constant output voltage 3). ___________ are the type of linear voltage regulatorsSeriesShuntBoth a and bNone of the aboveHintBoth series and shunt are the types of linear voltage regulators 4). ___________ is an example of fixed positive voltage regulatorIC7805IC7905IC7906None of the aboveHintAn IC7805 is an example of the fixed positive voltage regulator 5). ___________ is an example for fixed negative voltage regulatorIC7805IC7905IC7906None of the aboveHintAn IC7905 is an example of the fixed negative voltage regulator 6). ___________ is an example for positive adjustable voltage regulatorIC7805IC7905IC7906LM317HintLM317 is an example of a positive adjustable voltage regulator 7). The maximum input voltage of the LM78MXX IC range is _________35V40V45V50VHintThe maximum input voltage of the LM78MXX IC range is 35V 8). The maximum current of LM78MXX IC range is _________100mA500mA1mA200mAHintThe maximum current of LM78MXX IC range is 500mA 9). Which one is a type of linear voltage regulator?SeriesStep-downInverterAll of the aboveHintThe series voltage regulator is a type of linear voltage regulator 10). How many types of voltage regulators are there?OneTwoThreeFourHintThere are two types of voltage regulators are there they are linear and switching voltage 11). The fixed positive voltage regulators provides voltage in the range of _________+3 to +24V-3 to -24V+5 to +24V-5 to -24VHintThe fixed positive voltage regulators provide voltage in the range of +5 to +24V 12). The fixed negative voltage regulators provides voltage in the range of _________+3 to +24V-3 to -24V+5 to +24V-5 to -24VHint The fixed negative voltage regulators provide voltage in the range of -5 to -24V 13). The maximum current of LM78LXX IC range is _________100mA500mA1mA200mAHintThe maximum current of the LM78LXX IC range is 100mA 14). Which one is a type of switching voltage regulator?Step-upStep-downInverterAll of the aboveHintThe step-up, step-down, and inverter are the switching type voltage regulators Read more about Voltage Inverters 15). The maximum current of LM78XX IC range is _________100mA500mA1mA200mAHintThe maximum current of the LM78LXX IC range is 1mA 16). The maximum input voltage of the LM78LXX IC range is _________35V40V45V50VHint The maximum input voltage of the LM78LXX IC range is 35V 17). ___________ is an example for negative adjustable voltage regulatorIC7805IC7905LM337LM317HintLM337is an example of the negative adjustable voltage regulator 18). The maximum input voltage of the LM78XX IC is _______35V or 40V42V45V50VHintThe maximum input voltage of the LM78XX IC is 35V or 40V 19). The input voltage range of an IC 7805 voltage regulator is _______5V-12V7V-35V6V-12VNone of the aboveHintThe input voltage range of an IC 7805 voltage regulator is 7V-35V 20). In which type of regulator does 7805 IC is used?Fixed output voltage regulatorCurrent regulatorAdjustable output regulatorAll of the aboveHint An IC 7805 used in all fixed output voltage regulator, current regulator, and adjustable output regulatorVoltage Regulator Important MC's With Hints 21). Which IC is a fixed positive voltage regulator?LM78XXLM79XXLM2576LM2596HintIC LM78XX is a fixed positive voltage regulator 22). Which IC is a fixed negative voltage regulator?LM78XXLM79XXLM2576LM2596HintIC LM79XX is a fixed negative voltage regulator 23). Which IC is a fixed and adjustable switching voltage regulator?LM78XXLM2596LM2576Both b and cHintBoth LM2596 and LM2576 are fixed and adjustable switching voltage regulator 24). Which IC is a low power variable voltage regulator?LM78XXLM723LM2576Both b and cHint An IC LM723 is a low power variable voltage regulator 25). The maximum output voltage range of an IC 7805 voltage regulator is _______5.2V7.5V6.2VNone of the aboveHintThe maximum output voltage range of an IC 7805 voltage regulator is 5.2V 26). Which IC is an adjustable negative voltage regulator?LM333LM237LM337All of the aboveHintAn IC’s LM333, LM237, and LM337 are adjustable negative voltage regulators 27). Which IC is an adjustable positive voltage regulator?LM150LM350LM723Both a and bHintAn IC LM150 and LM350 both are adjustable positive voltage regulators 28). The three-terminal fixed output voltage regulators are ________Easy to useLess costHigh cost and complexity to useBoth a and bHintThe three-terminal fixed output voltage regulators are easy to use and the cost is less 29). What is the standard form of AVR?Amplified Voltage Regulator b) c) d)Automatic Voltage RegulatorAdjustable Voltage RegulatorNone of the aboveHintThe standard form of AVR is Automatic Voltage Regulator 30). The minimum output voltage range of an IC 7805 voltage regulator is _______5.2V7.5V6.2V4.8VHintThe minimum output voltage range of an IC 7805 voltage regulator is 4.8V 31). What is the standard form of CVT?Constant Voltage TransistorComplex Voltage TransistorConstant Voltage TransformerNone of the aboveHint The standard form of CVT is Constant Voltage Transformer Read more about Transformer 32). The ratio of (no load output voltage-full load output voltage/full load output voltage)*100% is known as ____________ regulationLineLoadBoth a and bNone of the aboveHintThe ratio of (no-load output voltage-full load output voltage/full load output voltage)*100% is known as load regulation 33). The output voltage and output current of LM317 adjustable positive voltage regulator is __________1.2 to 37V, 1.5 Amp1.8 to 37V, 1.5 Amp1.9to 37V, 1.5 Amp2.0 to 37V, 1.5 AmpHintThe output voltage of the LM317 adjustable positive voltage regulator is 1.2 to 37V, and the output current is 1.5 Amp 34). Which IC is a multi-point voltage regulator?78XX79XXLM723CNone of the aboveHintAn IC LM723C is a multi-point voltage regulator 35). Motorola’s MC1723 is a _________ regulatorFixed output voltageAdjustable output voltageSwitching regulatorNone of the aboveHintMotorola’s MC1723 is a switching type voltage regulator 36). How many types of IC voltage regulators are there?OneTwoThreeFourHintThere are three types of IC voltage regulators are there they are fixed output, adjustable output, and switching voltage regulators 37). Which IC is a three-pin type voltage regulator?78XX79XXLM723CBoth a and bHint78XX and 79XX series IC’s are three-pin type voltage regulators 38). How many pins does an IC 723 voltage regulator have?10 pins12 pins14 pins8 pinsHintAn IC 723 voltage regulator has 14 pins 39). What are the advantages of the switching regulator?Small sizeHigher efficiencyLightweightAll of the aboveHintThe advantages of the switching regulator are they are small in size, efficiency is high, and lightweight 40). What are the advantages of the three-terminal voltage regulators?Output noise is lowLess efficientRequires high currentNone of the aboveHintThe advantage of the three-terminal voltage regulator is that the noise output is lowVoltage Regulator MCQs for Quiz 41). What are the components used in voltage regulators?Feedback circuitPass element control circuitStable reference voltageAll of the aboveHintThe components used in voltage regulator are feedback circuit, pass element control circuit, and stable reference voltage 42). The regulators are categorized into ________TwoThreeFourFiveHintThe regulators are categorized into five types they are positive and negative adjustable, fixed output, tracking, and floating voltage regulators 43). What are the applications of the shunt regulator?Error amplifierVoltage monitoringPrecision current limitersAll of the aboveHintThe error amplifier, voltage monitoring, and precision current limiters are the applications of the shunt regulator Read more about Amplifiers 44). What are the disadvantages of the linear voltage regulators?Efficiency is highEfficiency is lowRequires large spaceBoth b and cHintThe main disadvantages of the linear voltage regulators are that the efficiency is low and requires large space 45). The linear series voltage regulator consists of _______Control elementReference voltageError detector and sample circuitAll of the aboveHintThe linear series voltage regulator consists of the control element, reference voltage, error detector, and sample circuit 46). An IC 723 acts as __________ClipperLow voltage regulatorHigh voltage regulatorBoth b and cHint An IC 723 acts as both a high and low voltage regulator 47). How much voltage does an IC 7924 provides?5V+5V-12V-24VHintAn IC 7924 provides -24 V 48). What is the minimum input voltage of the fixed IC 7805 voltage regulator?15V16V7V8VHintThe minimum input voltage of the fixed IC 7805 voltage regulator is 7V 49). An IC 7824 fixed positive voltage regulator input voltage range is between ____________7-25V8-25V10.5-25V27-38VHintAn IC 7824 fixed positive voltage regulator input voltage range is between 27-38V 50). The output voltage of an IC 7824 fixed positive voltage regulator is ________7V8V10.5V24VHintThe output voltage of an IC 7824 fixed positive voltage regulator is 24V 51). The output voltage of an IC 7912 fixed positive voltage regulator is ________-7V-8V-12V24VHintThe output voltage of an IC 7912 fixed positive voltage regulator is -12V 52). The output voltage of the device LM337 HVH adjustable negative voltage regulator is ______-1.2 to -37V8 to 25V10.5 to 25V27 to 38VHintThe output voltage of the device LM337 HVH adjustable negative voltage regulator is -1.2 to -37V 53). The maximum input voltage of the LM337LZ series adjustable negative voltage regulator is ________-1.2 to -37V40V10.5 V27 VHint The maximum input voltage of the LM337LZ series adjustable negative voltage regulator is 40V 54). How many methods are there to determine the voltage regulation?OneTwoFourEightHintThere are two methods are there to determine the voltage regulation are a direct and indirect method 55). The indirect method to determine the voltage regulation is categorized into ___________OneNineSixFourHintThe indirect method to determine the voltage regulation is categorized into four types they are EMF, MMF, ZPF, and ASA 56). What is the standard form of ZPF?Zener Power FactorZero Power FactorZero Phase FactorNone of the aboveHintThe standard form of ZPF is Zero Power Factor, it is one type of indirect method used to determine the voltage regulation 57). What is the standard form of ASA?Amplifier Standard AssociationAmerican Standard AssociationAutomation Standard AssociationNone of the aboveHintThe standard form of ASA is American Standard Association 58). How many pins does an IC 7805 voltage regulator consist of?OneSixThreeEightHintAn IC 7805 voltage regulator consists of three pins they are input, output, and ground pins 59). In how many conditions does the voltage regulator maintains constant output?OneTwoEightNineHint The voltage regulator maintains constant output even though input changes or load resistance changes 60). How many parameters are there to measure the regulation?OneTwoFiveSevenHintThere are two parameters are there to measure the regulation they are line and load regulationVoltage Regulator MCQs for Engineers 61). The ratio of change in the output voltage to the change in the input voltage is known as ______Line regulationLoad regulationBoth a and bNone of the aboveHintThe ratio of change in the output voltage to the change in the input voltage is known as line regulation, and the value of the line regulation should be 0% 62). The ratio of change in the output voltage from no load to full load to the change in the load current is known as ________Line regulationLoad regulationBoth a and bNone of the aboveHintThe ratio of change in the output voltage from no load to full load to the change in the load current is known as load regulation 63). When there is no load connected across the circuit that means _________No loadNo currentResistance is infiniteAll of the aboveHintWhen there is no load connected across the circuit that means there is no load and no current, when there is no current the resistance is infinite 64). The ideal value of the load regulation should be ______1%0%2%5%HintThe ideal value of the load regulation should be 0% 65). When there is no breakdown then the zener diode should be _______ONOFFHintThe Zener diode will be OFF when there is a no breakdown 66). When there is a breakdown then the Zener diode should be _______ONOFFHintThe Zener diode will be ON when there is a breakdown 67). The voltage across the Zener diode _________Less than or equal to the Zener voltageGreater than or equal to the Zener voltageEqual to the Zener voltageNone of the aboveHintThe voltage across the Zener diode is greater than or equal to the Zener voltage 68). Zener diode is widely used in ________Voltage regulationsRectifiersClippersNone of the aboveHintZener diode is widely used in voltage regulations to maintain the output voltage constant 69). In the case of the series voltage regulator, the controlling element is in _______Series with loadParallel with loadHintIn the case of the series voltage regulator, the controlling element is in series with the load 70). In switching regulator _________ acts as switchDiodeRectifierTransistorRelaysHintIn switching regulator transistor acts as a switch 71). The frequency range of the pulse generator is ______10KHz15KHz20KHz25KHzHintThe frequency range of the pulse generator is 20KHz 72). What are the advantages of transistor series voltage regulator?Efficiency is goodOutput impedance is lowRipple content is lowAll of the aboveHint In a transistor series voltage regulator the output impedance and ripple content is low at the output dc voltage, and the efficiency is good 73). The isolated converters are _________ typesOneTwoFiveEightHintThe isolated converters are of two types they are flyback and forward converters 74). The buck converter is an another name of __________ voltage regulatorStep-upStep-downAdjustableNone of the aboveHintThe buck converter is another name of the step-down voltage regulator 75). The boost converter is the another name of __________ voltage regulatorStep-upStep-downAdjustableNone of the aboveHintThe boost converter is another name for the step-up voltage regulator 76). ____________ are the limitations of the transistor series voltage regulatorPower dissipation is lowPower dissipation is highLess efficiencyBoth b and cHintThe limitations of the transistor series voltage regulator are power dissipation is high and the efficiency is less 77). What is the standard form of LPS?Load Power SupplyLine Power SupplyLinear Power SupplyNone of the aboveHintThe standard form of LPS is Linear Power Supply 78). What are the advantages of the linear power supply?Noise is lowRipple is lowCircuitry is simpleAll of the aboveHintThe advantages of the linear power supply are noise and ripple is low, and the circuitry is simple 79). What is the standard form of SMPS?Switch Mode Power SupplySwitch Main Power SupplySimple Mode Power SupplyNone of the aboveHintThe standard form of SMPS is Switch Mode Power Supply 80). What are the disadvantages of SMPS?Noise is presentCircuitry is complexProduces electromagnetic interferenceAll of the aboveHintIn SMPS due to high frequency switching the noise is present, produces electromagnetic interference, and the circuitry is complexVoltage Regulator MCQs for Interviews 81). What are the advantages of SMPS?Heat generation is lessPower wastage is lessBoth a and bNone of the aboveHintThe advantages of the SMPS are the heat generation and power wastage is less 82). What are the types of SMPS?DC to DC converterFlyback and forward converterAC to DC converterAll of the aboveHint The dc to dc converter, flyback, and forward converter, and ac to dc converters are the types of SMPS 83). Which one is not an active component?DiodesTransistorsTransformersResistorsHintResistors are not active components, it is a passive component Read more about Transformers 84). Which one is not a passive component?DiodesCapacitorsInductorsResistorsHintDiodes are not passive components, it is an active component 85). The signals are categorized into __________ typesOneTwoFiveFourHintThe signals are categorized into two types, they are analog and digital 86). The waveshaping are categorized into?OneTwoSixFourHintWaveshaping is of two types they are linear and non-linear waveshaping 87). The filters are categorized into?FiveTwoNineFourHintFilters are of four types they are low pass, high pass, bandpass, and bandstop filters 88). ___________ is a type of DC voltage regulatorZener diodeTransistor seriesGlow tubeAll of the aboveHintThe Zener diode, transistor series, and glow tube are the types of DC voltage regulator 89). How many circuits does the regulated power supply consist of?FiveEightThreeNineHintThe three circuits consist of a regulated power supply they are Zener voltage regulator, capacitor filter, and bridge rectifier 90). Which IC is a three-pin voltage regulator?FixedAdjustableBoth a and bNone of the aboveHint Both fixed and adjustable voltage regulators are three-pin voltage regulators 91). The shunt regulator efficiency is _________ compared to the series regulatorMoreLessHintThe shunt regulator efficiency is less compared to the series regulator 92). The efficiency of the switching regulator is __________60%≤90%>90%None of the aboveHintThe efficiency of the switching regulator is greater than 90% 93). What are the features of IC 723?It provides adjustable voltage output in the range of 2-37VIt operates in both positive & negative supplyIt provides internal power dissipation of 800mWAll of the aboveHintAn IC 723 provides adjustable voltage output in the range of 2-37V, provides internal power dissipation of 800mW, and operates in both positive & negative supply 94). The maximum amplifier input voltage of an absolute maximum rating of an IC 723 is ______8.5V9.5V10.5VNone of the aboveHintThe maximum amplifier input voltage of an absolute maximum rating of an IC 723 is 8.5V 95). Internal power dissipation value is _________ of an absolute maximum rating of an IC 7238.5mV660mV105mVNone of the aboveHintInternal power dissipation value is 660mV of an absolute maximum rating of an IC 723 96). The voltage in LM317 voltage regulator can be set by using __________Two external resistorsThree external resistorsFour external resistorsNone of the aboveHintThe voltage in the LM317 voltage regulator can be set by using two external resistors 97). The output voltage of an IC 7912 voltage regulator is ________8.5V66V-12VNone of the aboveHintThe output voltage of an IC 7912 voltage regulator is -12V 98). The output voltage of LM317 voltage regulator can be adjusted to ________1.2V to 37 V1.4V to 37 V1.6V to 37 VNone of the aboveHintThe output voltage of the LM317 voltage regulator can be adjusted to 1.2V to 37 V 99). LM317 voltage regulator suppliess more than ________1.0Amp1.2Amp1.5AmpNone of the aboveHintLM317 voltage regulator supplies more than 1.5Amp 100). An IC LM317 is a ___________ voltage regulatorAdjustable three-terminal positiveAdjustable three-terminal negativeAdjustable two-terminal positiveNone of the aboveHint An IC LM317 is an adjustable three-terminal positive voltage regulator Time is Up! Time's up
