Regulated DC Power Supply Question & Answers September 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 Hint 2). The unregulated power supply is used in ___________ Televisions Computers Mobile chargers All of the above Hint 3). How many terminals does monolithic voltage regulators have _____________ One Two Three Four Hint 4).The features of IC723 linear regulator are ______________ Small in size Low cost Had good load regulation All of the above Hint 5). The blocks that regulated DC power supply consists of ____________ Filter and rectifier circuit Transformer Voltage regulator circuit All of the above Hint 6). Which circuit is used for rectification? Center tap full-wave Half-wave Bridge full-wave rectifiers All of the above Hint 7). What are the commonly used filter circuits? Inductors Capacitor input RC, LC, RLC filter circuits All of the above Hint 8). The maximum output power of the push-pull converter topology of SMPS is _________ 200W 300W 400W 500W Hint 9). How many terminals do fixed voltage regulators have? One Two Three Four Hint 10). 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 Hint 11). ___________ are the commonly used type of voltage regulators IC voltage regulator Zener diode, SMPS Transistorized series All of the above Hint 12). The circuit design of switching regulated power supplies is ______________ Complex Moderately complex Simple None of the above Hint 13). The load regulation of switching regulated DC power supply is from ______________ 0.05% - 0.5% 5% - 15% 25% - 35% 1.5% - 2.5% Hint 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% Hint 15). What are the advantages of linear power supplies? Noise levels are low Reliable, simple Low-cost All of the above Hint 16). The ripple (RMS) of switching regulated DC power supply is between ______________ 10mv to 15mv 1mv to 15mv 10mv to 25mv 5mv to 15mv Hint 17). The efficiency of switching regulated DC power supply is ______________ 1-20% 70-85% 10-85% 10-20% Hint 18). The transient recovery of switching regulated DC power supply is ______________ 100 microseconds 300 microseconds 500 microseconds 1000 microseconds Hint 19). What are the advantages of switched power supplies? Small in size Light-weight Less expensive All of the above Hint 20). The hold-up time of switching regulated DC power supply is between ______________ 10-20 milliseconds 20-30 milliseconds 1-20 milliseconds 1000 microseconds Hint 21). The leakage in switching regulated DC power supply is ______________ High Low Very low Better Hint 22). What are the advantages of battery-based power supplies? Doesn’t require onsite power Portable Both a and b None of the above Hint 23). The size (power density) of switching regulated DC power supply is ______________ Large Small Very large None of the above Hint 24). 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 Hint 25). The power factor in switching regulated DC power supply with PFC is ______________ 1 – 7 0.01 – 0.7 0.1 – 0.7 >0.95 Hint Regulated DC Power Supply Important MCQ's 26). The weight of the switching regulated DC power supply is ______________ Light-weight Heavy Very large None of the above Hint 27). What are the disadvantages of linear power supplies? Large in size Expensive Poor efficiency All of the above Hint 28). The switch mode power supply has _____________ Regulator, rectifier Filter capacitor, transformer Series transistor All of the above Hint 29). What is the standard form of UPS? Uninterruptable Power Supply Uninterruptable Power Supply Hint 30). What is the standard form of SMPS? Single-Mode Power Supply Switch Mode Power Supply Simple Mode Power Supply None of the above Hint 31). An offline uninterruptable power supplies has ______________ change over time 10-20 milliseconds 3-8 milliseconds 1-20 milliseconds 1000 microseconds Hint 32). What are the disadvantages of switching regulated DC power supplies? Has higher noise Circuitry is complex Both a and b None of the above Hint 33). In inverters the changeover time is ______________ 10-20 milliseconds 500 milliseconds 1-20 milliseconds 1000 microseconds Hint 34). The uninterruptable power supplies categorized into _______________ One Two Three Four Hint 35). What are the disadvantages of battery-based regulated power supplies? Short life Fixed voltage input Both a and b None of the above Hint 36). Where uninterruptible power supplies are used? Data centers Industries Telecommunication All of the above Hint 37). What are the advantages of UPS? Maintains battery life Protects uncertain data loss Provides surge protection All of the above Hint 38). Which one of the following regulator costs is low? Linear Quasi-resonant switching PWM switching None of the above Hint 39). The maximum output power of the half-bridge converter topology of SMPS is _________ 1000W 300W 400W 500W Hint 40). Which one of the following has low maintenance? UPS Generators Both a and b None of the above Hint 41). In _________ regulator the mass is high Linear Quasi-resonant switching PWM switching None of the above Hint 42). The noise is high in _____________ regulator Linear Quasi-resonant switching PWM switching None of the above Hint 43). The power factor of AC lies between __________ 0 and 1 Always 1 Always 0 None of the above Hint 44). The power factor of DC lies between __________ 0 and 1 Always 1 Always 0 None of the above Hint 45). The direct current obtained from _____________ Mains AC generators Batteries or cells All of the above Hint 46). The alternate current obtained from _____________ Mains AC generators Both a and b None of the above Hint 47). The frequency of the direct current is __________ 60Hz 50Hz One Zero Hint 48). The frequency of the alternate current is __________ 60Hz 50Hz 50Hz or 60Hz Zero Hint 49). What is the unit of boost inductor? mH µF Ω None of the above Hint 50). In the circuit the DC flows in __________ One direction Two directions Multiple directions Only in a backward direction Hint Regulated DC Power Supply MCQ's with Hints 51). What is the unit of AC and DC resistors? mH µF Ω None of the above Hint 52). 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 Hint 53). 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 Hint 54). What is the unit of DC capacitors? mH µF Ω None of the above Hint 55). In _____________ power supply the input linear filter is required Switching Dc power supply Linear power supply Both a and b None of the above Hint 56). The holdup time of linear DC power supply is _________ 1ms-2ms 15ms-34ms 100ms-200ms 10ms-20ms Hint 57). The input voltage range of linear DC power supply is _________ ±1% ±5% ±20% ±10% Hint 58). The regulated DC power supply consists of ___________ Transformer, rectifier Smoothing, regulator Load All of the above Hint 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% Hint 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 Hint 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% Hint 62). What are the advantages of Zener diode? Simpler construction Fewer parts Both a and b None of the above Hint 63). The noise in linear DC power supply is ______________ 10mv to 15mv 1mv to 15mv 10mv to 25mv 20mv Hint 64). 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 Hint 65). The transient response in linear DC power supply is ______________ 10µs 20µs 30µs 50µs Hint 66). The design of the linear DC power supply is ______________ Simple Complex Very easy to design None of the above Hint 67). A _____________ circuit is used to smoothen the variations present in the rectified output Rectifier Transformer Oscillator Filtering Hint 68). What are the advantages of the series regulator? Simple to design Higher current capability Both a and b None of the above Hint 69). 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 Hint 70). The efficiency of linear DC power supply is between ____________ 5-10% 10-20% 10-30% 40-55% Hint 71). The input line filter is not required in __________ power supply SMPS Linear Both a and b None of the above Hint 72). The alternating current from transformer consumes___________ power Less More Extremely more None of the above Hint 73). The direct current from generator suitable for ___________ metal Non-ferrous Ferrous Both a and b None of the above Hint 74). The input voltage range of 7905 regulator is ____________ 1 to 5V 1 to 15V -7.5 to -25V 1 to 10V Hint 75). The output voltage of 7905 regulator is ____________ -5V -12V -15V -30V Hint Regulated 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 above Hint 77). The RF noise in the PWM switching regulator is _________ High Low Very low None of the above Hint 78). The circuit design of unregulated power supplies is _________ Simple Complex Moderately complex Very simple Hint 79). What are the disadvantages of the series regulator? Inefficient Simple to design Higher current capability None of the above Hint 80). What are the disadvantages of the three-terminal regulators? Less efficient Larger packages Higher currents required All of the above Hint 81). The input voltage range of 7912 regulator is ____________ 1 to 5V -14.5V to -35V -7.5 to -25V 1 to 10V Hint 82). The output voltage of 7912 regulator is ____________ 5V -12V -15V -30V Hint 83). The RF noise in resonant transition switching regulator is _________ High Low Very low Medium Hint 84). The line regulation of unregulated DC power supply is from ______________ Directly proportional to AC input 5% - 15% 25% - 35% 1.5% - 2.5% Hint 85). The ripple (RMS) of unregulated DC power supply is between ______________ 0.5v to 5v 1mv to 15mv 10mv to 25mv 5mv to 15mv Hint 86). The efficiency of unregulated power supplies is _________ 35-50% 70-80% 78-92% 90-95% Hint 87). The leakage in unregulated power supplies is ______________ High Low Very low Better Hint 88). The transformers are categorized into ___________ One Two Three Four Hint 89). The maximum output power of the forward converter topology of SMPS is _________ 200W 300W 400W >1000W Hint 90). ____________ filter is used to reduce the Hum and ripple Capacitor RC LC None of the above Hint 91). The input voltage range of 7915 regulator is ____________ 17.5V to -35V -14.5V to -35V -7.5 to -25V 1 to 10V Hint 92). The output voltage of 7915 regulator is ____________ -5V -12V -15V -30V Hint 93). The efficiency of the resonant transition switching regulator is _________ 35-50% 70-80% 78-92% None of the above Hint 94). The SMPS categorized into _______ types according to the output and input waveforms One Two Three Four Hint 95). ____________ are the topologies of switched-mode power supply Fly-back Push-pull H-bridge circuits All of the above Hint 96). ____________ are the non-isolated SMPS Boost converters Buck converters Buck-boost converters All of the above Hint 97). The maximum output power of the fly-back converter topology of SMPS is _________ 200W 300W 400W 500W Hint 98). ___________ are the categories of power supplies Linear regulated power supply Switching mode power supply Both a and b None of the above Hint 99). What are the drawbacks of UPS? Energy use Maintenance cost Both a and b None of the above Hint 100). The maximum output power of the full-bridge converter topology of SMPS is _________ 200W 300W 400W >1000W Hint Read more about Power Supply Read more about Capacitors Time is Up! Time's up
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