Regulated DC Power Supply Question & AnswersSeptember 2, 2021 By Wat Electrical Leave a Comment This article lists 100 Regulated DC Power Supply MCQs for engineering students. All the Regulated DC Power Supply Questions & Answers given below includes solution and link wherever possible to the relevant topic.In all electronic circuits, we require a constant DC voltage because the fluctuations in the input voltage may damage the electronic circuits, so to avoid this we use a regulated power supply.The voltage regulator is defined as a circuit that keeps the output voltage constant even though the voltage and load vary. A typical power supply unit consists of a transformer, rectifier, and smoothing. 1). The regulated power supply is used in _________________DC motorsRelaysActuatorsAll of the aboveHintThe regulated power supply is used in DC motors, relays, and actuators 2). The unregulated power supply is used in ___________TelevisionsComputersMobile chargersAll of the aboveHintThe unregulated power supply is used in television, computers, and mobile chargers 3). How many terminals does monolithic voltage regulators have _____________OneTwoThreeFourHintThe monolithic voltage regulators have three terminals they are input, output, and common terminals 4).The features of IC723 linear regulator are ______________Small in sizeLow costHad good load regulationAll of the aboveHintThe features of the IC723 linear regulator is small in size, low cost, and it had good load regulation 5). The blocks that regulated DC power supply consists of ____________Filter and rectifier circuitTransformerVoltage regulator circuitAll of the aboveHintThe blocks that regulated DC power supply consists of filter and rectifier circuit, transformer, and voltage regulator circuit 6). Which circuit is used for rectification?Center tap full-waveHalf-waveBridge full-wave rectifiersAll of the aboveHintThe center tap full-wave, half-wave, bridge full-wave rectifiers used for rectification 7). What are the commonly used filter circuits?InductorsCapacitor inputRC, LC, RLC filter circuitsAll of the aboveHintThe inductors, capacitor input, RC, LC, RLC are the commonly used filter circuits 8). The maximum output power of the push-pull converter topology of SMPS is _________200W300W400W500WHintThe maximum output power of the push-pull converter topology of SMPS is 500W 9). How many terminals do fixed voltage regulators have?OneTwoThreeFourHintThe fixed voltage regulators have three terminals they are input, output, and ground terminals 10). Which one of the following is a three-terminal fixed voltage regulator?Fixed voltage regulatorAdjustable voltage regulatorBoth a and bNone of the aboveHintBoth fixed and adjustable voltage regulators are three-terminal fixed voltage regulators 11). ___________ are the commonly used type of voltage regulatorsIC voltage regulatorZener diode, SMPSTransistorized seriesAll of the aboveHintThe IC voltage regulator, Zener diode, SMPS, and transistorized series are the commonly used type of voltage regulators 12). The circuit design of switching regulated power supplies is ______________ComplexModerately complexSimpleNone of the aboveHintThe circuit design of switching regulated power supplies is complex 13). The load regulation of switching regulated DC power supply is from ______________0.05% - 0.5%5% - 15%25% - 35%1.5% - 2.5%HintThe load regulation of switching regulated DC power supply is from 0.05% - 0.5% 14). The line regulation of switching regulated DC power supply is from ______________0.05% - 0.5%0.05% - 0.1%25% - 35%1.5% - 2.5%HintThe line regulation of switching regulated DC power supply is from 0.05% - 0.1% 15). What are the advantages of linear power supplies?Noise levels are lowReliable, simpleLow-costAll of the aboveHintThe advantages of linear power supplies are they have low noise levels, they are reliable and simple, and the cost is low 16). The ripple (RMS) of switching regulated DC power supply is between ______________10mv to 15mv1mv to 15mv10mv to 25mv5mv to 15mvHintThe ripple (RMS) of switching regulated DC power supply is between 10mv to 25mv 17). The efficiency of switching regulated DC power supply is ______________1-20%70-85%10-85%10-20%HintThe efficiency of switching regulated DC power supply is 70-85% 18). The transient recovery of switching regulated DC power supply is ______________100 microseconds300 microseconds500 microseconds1000 microsecondsHintThe transient recovery of switching regulated DC power supply is 300 microseconds 19). What are the advantages of switched power supplies?Small in sizeLight-weightLess expensiveAll of the aboveHintThe advantages of switched power supplies are they are small in size, light-weight, and less expensive 20). The hold-up time of switching regulated DC power supply is between ______________10-20 milliseconds20-30 milliseconds1-20 milliseconds1000 microsecondsHintThe hold-up time of switching regulated DC power supply is between 20-30 milliseconds 21). The leakage in switching regulated DC power supply is ______________HighLowVery lowBetterHintThe leakage in switching regulated DC power supply is high 22). What are the advantages of battery-based power supplies?Doesn’t require onsite powerPortableBoth a and bNone of the aboveHintThe advantages of battery-based power supplies are they are portable and doesn’t require onsite power 23). The size (power density) of switching regulated DC power supply is ______________LargeSmallVery largeNone of the aboveHintThe size (power density) of switching regulated DC power supply is small 24). The power factor in switching regulated DC power supply without PFC is ______________1 – 70.01 – 0.70.1 – 0.70.6 – 0.7HintThe power factor in switching regulated DC power supply without PFC is 0.6 – 0.7 25). The power factor in switching regulated DC power supply with PFC is ______________1 – 70.01 – 0.70.1 – 0.7>0.95HintThe power factor in switching regulated DC power supply with PFC is >0.95Regulated DC Power Supply Important MCQ's 26). The weight of the switching regulated DC power supply is ______________Light-weightHeavyVery largeNone of the aboveHintThe weight of the switching regulated DC power supply is very light 27). What are the disadvantages of linear power supplies?Large in sizeExpensivePoor efficiencyAll of the aboveHintThe disadvantages of linear power supplies are size is large, expensive, and the efficiency is poor 28). The switch mode power supply has _____________Regulator, rectifierFilter capacitor, transformerSeries transistorAll of the aboveHintThe switch-mode power supply has a regulator, rectifier, filter capacitor, transformer, and series transistor 29). What is the standard form of UPS?Uninterruptable Power SupplyUninterruptable Power SupplyUninterruptable Power SupplyUninterruptable Power SupplyHintThe standard form of UPS is Uninterruptable Power Supply 30). What is the standard form of SMPS?Single-Mode Power SupplySwitch Mode Power SupplySimple Mode Power SupplyNone of the aboveHintThe standard form of SMPS is Switch Mode Power Supply 31). An offline uninterruptable power supplies has ______________ change over time10-20 milliseconds3-8 milliseconds1-20 milliseconds1000 microsecondsHintAn offline uninterruptable power supply has 3-8 milliseconds change over time 32). What are the disadvantages of switching regulated DC power supplies?Has higher noiseCircuitry is complexBoth a and bNone of the aboveHintThe disadvantages of switching regulated DC power supplies are they have higher noise, and the circuitry is complex 33). In inverters the changeover time is ______________10-20 milliseconds500 milliseconds1-20 milliseconds1000 microsecondsHintIn inverters, the changeover time is 500 milliseconds 34). The uninterruptable power supplies categorized into _______________OneTwoThreeFourHintThe uninterruptable power supplies are categorized into three types they are offline UPS, online UPS, and line-interactive UPS 35). What are the disadvantages of battery-based regulated power supplies?Short lifeFixed voltage inputBoth a and bNone of the aboveHintThe battery-based regulated power supplies have a short life and the input voltage is fixed 36). Where uninterruptible power supplies are used?Data centersIndustriesTelecommunicationAll of the aboveHintAn uninterruptible power supplies are used in data centers, industries, telecommunications, etc 37). What are the advantages of UPS?Maintains battery lifeProtects uncertain data lossProvides surge protectionAll of the aboveHintThe advantages of UPS are it maintains battery life, protects uncertain data loss, and provides surge protection 38). Which one of the following regulator costs is low?LinearQuasi-resonant switchingPWM switchingNone of the aboveHintThe linear regulator costs is low compare to other regulators 39). The maximum output power of the half-bridge converter topology of SMPS is _________1000W300W400W500WHintThe maximum output power of the half-bridge converter topology of SMPS is 1000W 40). Which one of the following has low maintenance?UPSGeneratorsBoth a and bNone of the aboveHintThe maintenance is low in uninterrupted power supply 41). In _________ regulator the mass is highLinearQuasi-resonant switchingPWM switchingNone of the aboveHintIn linear regulator the mass is high 42). The noise is high in _____________ regulatorLinearQuasi-resonant switchingPWM switchingNone of the aboveHintThe noise is high in the PWM switching regulator 43). The power factor of AC lies between __________0 and 1Always 1Always 0None of the aboveHintThe power factor of AC lies between 0 and 1 44). The power factor of DC lies between __________0 and 1Always 1Always 0None of the aboveHintThe power factor of DC lies between always one 45). The direct current obtained from _____________MainsAC generatorsBatteries or cellsAll of the aboveHintThe direct current obtained from batteries or cells 46). The alternate current obtained from _____________MainsAC generatorsBoth a and bNone of the aboveHintThe alternate current obtained from mains and AC generators 47). The frequency of the direct current is __________60Hz50HzOneZeroHintThe frequency of the direct current is zero 48). The frequency of the alternate current is __________60Hz50Hz50Hz or 60HzZeroHintThe frequency of the alternate current is 50Hz or 60Hz 49). What is the unit of boost inductor?mHµFΩNone of the aboveHintThe unit of boost inductor is mH 50). In the circuit the DC flows in __________One directionTwo directionsMultiple directionsOnly in a backward directionHintIn the circuit, the DC flows in one direction onlyRegulated DC Power Supply MCQ's with Hints 51). What is the unit of AC and DC resistors?mHµFΩNone of the aboveHintThe unit of AC and DC resistors is Ω 52). In which one of the following power supply the reliability is low?Switching Dc power supplyLinear power supplyBoth a and bNone of the aboveHintIn switching DC power supply the reliability is low 53). In which one of the following power supply the maintenance cost is high?Switching DC power supplyLinear power supplyBoth a and bNone of the aboveHintIn a linear power supply, the maintenance cost is high compared to switching DC power supply 54). What is the unit of DC capacitors?mHµFΩNone of the aboveHintThe unit of DC capacitors is µF 55). In _____________ power supply the input linear filter is requiredSwitching Dc power supplyLinear power supplyBoth a and bNone of the aboveHintIn switching DC power supply the input linear filter is required 56). The holdup time of linear DC power supply is _________1ms-2ms15ms-34ms100ms-200ms10ms-20msHintThe holdup time of linear DC power supply is 1ms-2ms 57). The input voltage range of linear DC power supply is _________±1%±5%±20%±10%HintThe input voltage range of linear DC power supply is ±10% 58). The regulated DC power supply consists of ___________Transformer, rectifierSmoothing, regulatorLoadAll of the aboveHintThe regulated DC power supply consists of a transformer, rectifier, smoothing, regulator, and load 59). The load regulation of linear DC power supply is between ______________0.05% - 0.5%0.02% - 0.1%25% - 35%1.5% - 2.5%HintThe load regulation of linear DC power supply is between 0.02% - 0.1% 60). What is the function of a transformer in a regulated DC power supply?Reduce the 230V Ac input voltageIncreases the 230V Ac input voltageDoesn’t change the input voltageNone of the aboveHintThe function of a transformer in a regulated DC power supply is it reduces the 230V Ac input voltage to a lower value 61). The line regulation of linear DC power supply is between ______________0.05% - 0.5%0.02% - 0.05%25% - 35%1.5% - 2.5%HintThe line regulation of linear DC power supply is between 0.02% - 0.05% 62). What are the advantages of Zener diode?Simpler constructionFewer partsBoth a and bNone of the aboveHintThe construction of the Zener diode is simple and it has fewer parts 63). The noise in linear DC power supply is ______________10mv to 15mv1mv to 15mv10mv to 25mv20mvHintThe noise in the linear DC power supply is 20mv 64). What is the function of the rectifier in the DC power supply?Converts AC to pulsating DCConverts DC to ACBoth a and bNone of the aboveHintThe function of the rectifier in the DC power supply is to convert AC into a pulsating DC 65). The transient response in linear DC power supply is ______________10µs20µs30µs50µsHintThe transient response in linear DC power supply is 50µs 66). The design of the linear DC power supply is ______________SimpleComplexVery easy to designNone of the aboveHintThe design of the linear DC power supply is simple compare to other power supplies 67). A _____________ circuit is used to smoothen the variations present in the rectified outputRectifierTransformerOscillatorFilteringHintA filtering circuit is used to smoothen the variations present in the rectified output 68). What are the advantages of the series regulator?Simple to designHigher current capabilityBoth a and bNone of the aboveHintThe series regulators are simple to design, and it has the higher current capability 69). What are the advantages of the three-terminal regulator?Lowest output noise and rippleSimplest design for end-userFewer partsAll of the aboveHintThe three-terminal regulators have the lowest output noise and ripple, it is the simplest design for end-user, and it has fewer parts 70). The efficiency of linear DC power supply is between ____________5-10%10-20%10-30%40-55%HintThe efficiency of linear DC power supply is between 40-55% 71). The input line filter is not required in __________ power supplySMPSLinearBoth a and bNone of the aboveHintThe input line filter is not required in linear power supply 72). The alternating current from transformer consumes___________ powerLessMoreExtremely moreNone of the aboveHintThe alternating current from transformer consumes less power 73). The direct current from generator suitable for ___________ metalNon-ferrousFerrousBoth a and bNone of the aboveHintThe direct current from generator is suitable for both non-ferrous and ferrous metals 74). The input voltage range of 7905 regulator is ____________1 to 5V1 to 15V-7.5 to -25V1 to 10VHintThe input voltage range of 7905 regulator is -7.5 to -25V 75). The output voltage of 7905 regulator is ____________-5V-12V-15V-30VHintThe output voltage of 7905 regulators is -5VRegulated DC Power Supply MCQ's for Quiz 76). The efficiency of the PWM switching regulator is _________35-50%70-80%78-92%None of the aboveHintThe efficiency of the PWM switching regulator is 70-80% 77). The RF noise in the PWM switching regulator is _________HighLowVery lowNone of the aboveHintThe RF noise in the PWM switching regulator is high 78). The circuit design of unregulated power supplies is _________SimpleComplexModerately complexVery simpleHintThe circuit design of unregulated power supplies is simple 79). What are the disadvantages of the series regulator?InefficientSimple to designHigher current capabilityNone of the aboveHintThe disadvantages of the series regulator is they are inefficient 80). What are the disadvantages of the three-terminal regulators?Less efficientLarger packagesHigher currents requiredAll of the aboveHintThe three-terminal regulators are less efficient, has larger packages, and high current is required 81). The input voltage range of 7912 regulator is ____________1 to 5V-14.5V to -35V-7.5 to -25V1 to 10VHintThe input voltage range of 7912 regulators is -14.5V to -35V 82). The output voltage of 7912 regulator is ____________5V-12V-15V-30VHintThe output voltage of 7912 regulators is -12V 83). The RF noise in resonant transition switching regulator is _________HighLowVery lowMediumHintThe RF noise in resonant transition switching regulator is medium 84). The line regulation of unregulated DC power supply is from ______________Directly proportional to AC input5% - 15%25% - 35%1.5% - 2.5%HintThe line regulation of unregulated DC power supply is directly proportional to alternating current input change 85). The ripple (RMS) of unregulated DC power supply is between ______________0.5v to 5v1mv to 15mv10mv to 25mv5mv to 15mvHintThe ripple (RMS) of unregulated DC power supply is between 0.5V to 5V 86). The efficiency of unregulated power supplies is _________35-50%70-80%78-92%90-95%HintThe efficiency of unregulated power supplies is 90-95% 87). The leakage in unregulated power supplies is ______________HighLowVery lowBetterHintThe leakage in unregulated power supplies is very low 88). The transformers are categorized into ___________OneTwoThreeFourHintThe transformers are categorized into two types they are step down and step up 89). The maximum output power of the forward converter topology of SMPS is _________200W300W400W>1000WHintThe maximum output power of the forward converter topology of SMPS is 300W 90). ____________ filter is used to reduce the Hum and rippleCapacitorRCLCNone of the aboveHintThe LC filter is used to reduce the Hum and ripple 91). The input voltage range of 7915 regulator is ____________17.5V to -35V-14.5V to -35V-7.5 to -25V1 to 10VHintThe input voltage range of 7915 regulators is -17.5V to -35V 92). The output voltage of 7915 regulator is ____________-5V-12V-15V-30VHintThe output voltage of 7915 regulators is -15V 93). The efficiency of the resonant transition switching regulator is _________35-50%70-80%78-92%None of the aboveHintThe efficiency of the resonant transition switching regulator is 78-92% 94). The SMPS categorized into _______ types according to the output and input waveformsOneTwoThreeFourHintThe SMPS is categorized into four types according to the output and input waveforms they are AC in DC out, DC in DC out, AC in AC out, and DC in AC out 95). ____________ are the topologies of switched-mode power supplyFly-backPush-pullH-bridge circuitsAll of the aboveHintThe fly-back, push-pull, and H-bridge circuits are some topologies of switched-mode power supply 96). ____________ are the non-isolated SMPSBoost convertersBuck convertersBuck-boost convertersAll of the aboveHintThe boost, buck, and buck-boost converters are the non-isolated SMPS 97). The maximum output power of the fly-back converter topology of SMPS is _________200W300W400W500WHintThe maximum output power of the fly-back converter topology of SMPS is 200W 98). ___________ are the categories of power suppliesLinear regulated power supplySwitching mode power supplyBoth a and bNone of the aboveHintThe linear regulated power supply and switching mode power supply are the categories of power supplies 99). What are the drawbacks of UPS?Energy useMaintenance costBoth a and bNone of the aboveHintThe drawbacks of UPS is the maintenance cost is high, and more energy is required 100). The maximum output power of the full-bridge converter topology of SMPS is _________200W300W400W>1000WHintThe maximum output power of the full-bridge converter topology of SMPS is >1000W Read more about Power Supply Read more about Capacitors Time is Up! Time's up
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