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 motors Relays Actuators All of the above HintThe regulated power supply is used in DC motors, relays, and actuators2). The unregulated power supply is used in ___________ Televisions Computers Mobile chargers All of the above HintThe unregulated power supply is used in television, computers, and mobile chargers3). How many terminals does monolithic voltage regulators have _____________ One Two Three Four HintThe monolithic voltage regulators have three terminals they are input, output, and common terminals4).The features of IC723 linear regulator are ______________ Small in size Low cost Had good load regulation All of the above HintThe features of the IC723 linear regulator is small in size, low cost, and it had good load regulation5). The blocks that regulated DC power supply consists of ____________ Filter and rectifier circuit Transformer Voltage regulator circuit All of the above HintThe 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-wave Half-wave Bridge full-wave rectifiers All of the above HintThe center tap full-wave, half-wave, bridge full-wave rectifiers used for rectification7). What are the commonly used filter circuits? Inductors Capacitor input RC, LC, RLC filter circuits All of the above HintThe inductors, capacitor input, RC, LC, RLC are the commonly used filter circuits8). The maximum output power of the push-pull converter topology of SMPS is _________ 200W 300W 400W 500W HintThe maximum output power of the push-pull converter topology of SMPS is 500W9). How many terminals do fixed voltage regulators have? One Two Three Four HintThe fixed voltage regulators have three terminals they are input, output, and ground terminals10). Which one of the following is a three-terminal fixed voltage regulator? Fixed voltage regulator Adjustable voltage regulator Both a and b None of the above HintBoth fixed and adjustable voltage regulators are three-terminal fixed voltage regulators11). ___________ are the commonly used type of voltage regulators IC voltage regulator Zener diode, SMPS Transistorized series All of the above HintThe IC voltage regulator, Zener diode, SMPS, and transistorized series are the commonly used type of voltage regulators12). The circuit design of switching regulated power supplies is ______________ Complex Moderately complex Simple None of the above HintThe circuit design of switching regulated power supplies is complex13). 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 low Reliable, simple Low-cost All of the above HintThe advantages of linear power supplies are they have low noise levels, they are reliable and simple, and the cost is low16). The ripple (RMS) of switching regulated DC power supply is between ______________ 10mv to 15mv 1mv to 15mv 10mv to 25mv 5mv to 15mv HintThe ripple (RMS) of switching regulated DC power supply is between 10mv to 25mv17). 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 microseconds 300 microseconds 500 microseconds 1000 microseconds HintThe transient recovery of switching regulated DC power supply is 300 microseconds19). What are the advantages of switched power supplies? Small in size Light-weight Less expensive All of the above HintThe advantages of switched power supplies are they are small in size, light-weight, and less expensive20). The hold-up time of switching regulated DC power supply is between ______________ 10-20 milliseconds 20-30 milliseconds 1-20 milliseconds 1000 microseconds HintThe hold-up time of switching regulated DC power supply is between 20-30 milliseconds 21). The leakage in switching regulated DC power supply is ______________ High Low Very low Better HintThe leakage in switching regulated DC power supply is high22). What are the advantages of battery-based power supplies? Doesn’t require onsite power Portable Both a and b None of the above HintThe advantages of battery-based power supplies are they are portable and doesn’t require onsite power23). The size (power density) of switching regulated DC power supply is ______________ Large Small Very large None of the above HintThe size (power density) of switching regulated DC power supply is small24). The power factor in switching regulated DC power supply without PFC is ______________ 1 – 7 0.01 – 0.7 0.1 – 0.7 0.6 – 0.7 HintThe power factor in switching regulated DC power supply without PFC is 0.6 – 0.725). The power factor in switching regulated DC power supply with PFC is ______________ 1 – 7 0.01 – 0.7 0.1 – 0.7 >0.95 HintThe power factor in switching regulated DC power supply with PFC is >0.95Regulated DC Power Supply Important MCQ's26). The weight of the switching regulated DC power supply is ______________ Light-weight Heavy Very large None of the above HintThe weight of the switching regulated DC power supply is very light 27). What are the disadvantages of linear power supplies? Large in size Expensive Poor efficiency All of the above HintThe disadvantages of linear power supplies are size is large, expensive, and the efficiency is poor28). The switch mode power supply has _____________ Regulator, rectifier Filter capacitor, transformer Series transistor All of the above HintThe switch-mode power supply has a regulator, rectifier, filter capacitor, transformer, and series transistor29). What is the standard form of UPS? Uninterruptable Power Supply Uninterruptable Power Supply Uninterruptable Power Supply Uninterruptable Power Supply HintThe standard form of UPS is Uninterruptable Power Supply30). What is the standard form of SMPS? Single-Mode Power Supply Switch Mode Power Supply Simple Mode Power Supply None of the above HintThe standard form of SMPS is Switch Mode Power Supply31). An offline uninterruptable power supplies has ______________ change over time 10-20 milliseconds 3-8 milliseconds 1-20 milliseconds 1000 microseconds HintAn offline uninterruptable power supply has 3-8 milliseconds change over time32). What are the disadvantages of switching regulated DC power supplies? Has higher noise Circuitry is complex Both a and b None of the above HintThe disadvantages of switching regulated DC power supplies are they have higher noise, and the circuitry is complex33). In inverters the changeover time is ______________ 10-20 milliseconds 500 milliseconds 1-20 milliseconds 1000 microseconds HintIn inverters, the changeover time is 500 milliseconds34). The uninterruptable power supplies categorized into _______________ One Two Three Four HintThe uninterruptable power supplies are categorized into three types they are offline UPS, online UPS, and line-interactive UPS35). What are the disadvantages of battery-based regulated power supplies? Short life Fixed voltage input Both a and b None of the above HintThe battery-based regulated power supplies have a short life and the input voltage is fixed36). Where uninterruptible power supplies are used? Data centers Industries Telecommunication All of the above HintAn uninterruptible power supplies are used in data centers, industries, telecommunications, etc37). What are the advantages of UPS? Maintains battery life Protects uncertain data loss Provides surge protection All of the above HintThe advantages of UPS are it maintains battery life, protects uncertain data loss, and provides surge protection38). Which one of the following regulator costs is low? Linear Quasi-resonant switching PWM switching None of the above HintThe linear regulator costs is low compare to other regulators39). The maximum output power of the half-bridge converter topology of SMPS is _________ 1000W 300W 400W 500W HintThe maximum output power of the half-bridge converter topology of SMPS is 1000W40). Which one of the following has low maintenance? UPS Generators Both a and b None of the above HintThe maintenance is low in uninterrupted power supply41). In _________ regulator the mass is high Linear Quasi-resonant switching PWM switching None of the above HintIn linear regulator the mass is high42). The noise is high in _____________ regulator Linear Quasi-resonant switching PWM switching None of the above HintThe noise is high in the PWM switching regulator43). The power factor of AC lies between __________ 0 and 1 Always 1 Always 0 None of the above HintThe power factor of AC lies between 0 and 144). The power factor of DC lies between __________ 0 and 1 Always 1 Always 0 None of the above HintThe power factor of DC lies between always one45). The direct current obtained from _____________ Mains AC generators Batteries or cells All of the above HintThe direct current obtained from batteries or cells46). The alternate current obtained from _____________ Mains AC generators Both a and b None of the above HintThe alternate current obtained from mains and AC generators47). The frequency of the direct current is __________ 60Hz 50Hz One Zero HintThe frequency of the direct current is zero48). The frequency of the alternate current is __________ 60Hz 50Hz 50Hz or 60Hz Zero HintThe frequency of the alternate current is 50Hz or 60Hz49). What is the unit of boost inductor? mH µF Ω None of the above HintThe unit of boost inductor is mH50). In the circuit the DC flows in __________ One direction Two directions Multiple directions Only in a backward direction HintIn the circuit, the DC flows in one direction onlyRegulated DC Power Supply MCQ's with Hints51). What is the unit of AC and DC resistors? mH µF Ω None of the above HintThe unit of AC and DC resistors is Ω52). In which one of the following power supply the reliability is low? Switching Dc power supply Linear power supply Both a and b None of the above HintIn switching DC power supply the reliability is low53). In which one of the following power supply the maintenance cost is high? Switching DC power supply Linear power supply Both a and b None of the above HintIn a linear power supply, the maintenance cost is high compared to switching DC power supply54). What is the unit of DC capacitors? mH µF Ω None of the above HintThe unit of DC capacitors is µF55). In _____________ power supply the input linear filter is required Switching Dc power supply Linear power supply Both a and b None of the above HintIn switching DC power supply the input linear filter is required56). The holdup time of linear DC power supply is _________ 1ms-2ms 15ms-34ms 100ms-200ms 10ms-20ms HintThe holdup time of linear DC power supply is 1ms-2ms57). 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, rectifier Smoothing, regulator Load All of the above HintThe regulated DC power supply consists of a transformer, rectifier, smoothing, regulator, and load59). 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 voltage Increases the 230V Ac input voltage Doesn’t change the input voltage None of the above HintThe function of a transformer in a regulated DC power supply is it reduces the 230V Ac input voltage to a lower value61). 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 construction Fewer parts Both a and b None of the above HintThe construction of the Zener diode is simple and it has fewer parts63). The noise in linear DC power supply is ______________ 10mv to 15mv 1mv to 15mv 10mv to 25mv 20mv HintThe noise in the linear DC power supply is 20mv64). What is the function of the rectifier in the DC power supply? Converts AC to pulsating DC Converts DC to AC Both a and b None of the above HintThe function of the rectifier in the DC power supply is to convert AC into a pulsating DC65). The transient response in linear DC power supply is ______________ 10µs 20µs 30µs 50µs HintThe transient response in linear DC power supply is 50µs66). The design of the linear DC power supply is ______________ Simple Complex Very easy to design None of the above HintThe design of the linear DC power supply is simple compare to other power supplies67). A _____________ circuit is used to smoothen the variations present in the rectified output Rectifier Transformer Oscillator Filtering HintA filtering circuit is used to smoothen the variations present in the rectified output68). What are the advantages of the series regulator? Simple to design Higher current capability Both a and b None of the above HintThe series regulators are simple to design, and it has the higher current capability69). What are the advantages of the three-terminal regulator? Lowest output noise and ripple Simplest design for end-user Fewer parts All of the above HintThe three-terminal regulators have the lowest output noise and ripple, it is the simplest design for end-user, and it has fewer parts70). 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 supply SMPS Linear Both a and b None of the above HintThe input line filter is not required in linear power supply72). The alternating current from transformer consumes___________ power Less More Extremely more None of the above HintThe alternating current from transformer consumes less power 73). The direct current from generator suitable for ___________ metal Non-ferrous Ferrous Both a and b None of the above HintThe direct current from generator is suitable for both non-ferrous and ferrous metals74). The input voltage range of 7905 regulator is ____________ 1 to 5V 1 to 15V -7.5 to -25V 1 to 10V HintThe input voltage range of 7905 regulator is -7.5 to -25V75). The output voltage of 7905 regulator is ____________ -5V -12V -15V -30V HintThe output voltage of 7905 regulators is -5VRegulated DC Power Supply MCQ's for Quiz76). The efficiency of the PWM switching regulator is _________ 35-50% 70-80% 78-92% None of the above HintThe efficiency of the PWM switching regulator is 70-80%77). The RF noise in the PWM switching regulator is _________ High Low Very low None of the above HintThe RF noise in the PWM switching regulator is high78). The circuit design of unregulated power supplies is _________ Simple Complex Moderately complex Very simple HintThe circuit design of unregulated power supplies is simple79). What are the disadvantages of the series regulator? Inefficient Simple to design Higher current capability None of the above HintThe disadvantages of the series regulator is they are inefficient80). What are the disadvantages of the three-terminal regulators? Less efficient Larger packages Higher currents required All of the above HintThe three-terminal regulators are less efficient, has larger packages, and high current is required81). The input voltage range of 7912 regulator is ____________ 1 to 5V -14.5V to -35V -7.5 to -25V 1 to 10V HintThe input voltage range of 7912 regulators is -14.5V to -35V82). The output voltage of 7912 regulator is ____________ 5V -12V -15V -30V HintThe output voltage of 7912 regulators is -12V83). The RF noise in resonant transition switching regulator is _________ High Low Very low Medium HintThe RF noise in resonant transition switching regulator is medium84). The line regulation of unregulated DC power supply is from ______________ Directly proportional to AC input 5% - 15% 25% - 35% 1.5% - 2.5% HintThe line regulation of unregulated DC power supply is directly proportional to alternating current input change85). The ripple (RMS) of unregulated DC power supply is between ______________ 0.5v to 5v 1mv to 15mv 10mv to 25mv 5mv to 15mv HintThe ripple (RMS) of unregulated DC power supply is between 0.5V to 5V86). 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 ______________ High Low Very low Better HintThe leakage in unregulated power supplies is very low88). The transformers are categorized into ___________ One Two Three Four HintThe transformers are categorized into two types they are step down and step up89). The maximum output power of the forward converter topology of SMPS is _________ 200W 300W 400W >1000W HintThe maximum output power of the forward converter topology of SMPS is 300W 90). ____________ filter is used to reduce the Hum and ripple Capacitor RC LC None of the above HintThe LC filter is used to reduce the Hum and ripple91). The input voltage range of 7915 regulator is ____________ 17.5V to -35V -14.5V to -35V -7.5 to -25V 1 to 10V HintThe input voltage range of 7915 regulators is -17.5V to -35V92). The output voltage of 7915 regulator is ____________ -5V -12V -15V -30V HintThe output voltage of 7915 regulators is -15V93). The efficiency of the resonant transition switching regulator is _________ 35-50% 70-80% 78-92% None of the above HintThe efficiency of the resonant transition switching regulator is 78-92%94). The SMPS categorized into _______ types according to the output and input waveforms One Two Three Four HintThe 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 out95). ____________ are the topologies of switched-mode power supply Fly-back Push-pull H-bridge circuits All of the above HintThe fly-back, push-pull, and H-bridge circuits are some topologies of switched-mode power supply96). ____________ are the non-isolated SMPS Boost converters Buck converters Buck-boost converters All of the above HintThe boost, buck, and buck-boost converters are the non-isolated SMPS97). The maximum output power of the fly-back converter topology of SMPS is _________ 200W 300W 400W 500W HintThe maximum output power of the fly-back converter topology of SMPS is 200W98). ___________ are the categories of power supplies Linear regulated power supply Switching mode power supply Both a and b None of the above HintThe linear regulated power supply and switching mode power supply are the categories of power supplies99). What are the drawbacks of UPS? Energy use Maintenance cost Both a and b None of the above HintThe drawbacks of UPS is the maintenance cost is high, and more energy is required100). The maximum output power of the full-bridge converter topology of SMPS is _________ 200W 300W 400W >1000W HintThe 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
Leave a Reply