Regulated DC Power Supply Question & Answers June 5, 2021 By WatElectronics This article lists 80+ 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. A regulated power supply is an embedded circuit that converts unregulated AC voltage or current to a constant DC. A regulated power supply is also called a linear power supply. A step-down transformer, rectifier, DC filter, regulator are the basic building blocks of regulated DC power supply. The blocks that regulated the DC power supply consist of filter and rectifier circuit, transformer, and voltage regulator circuit. The fixed voltage regulators have three terminals they are input, output, and ground terminals. Both fixed and adjustable voltage regulators are three-terminal fixed voltage regulators. The IC voltage regulator, Zener diode, SMPS, and transistorized series are the commonly used type of voltage regulators. The advantages of linear power supplies are they have low noise levels, they are reliable and simple, and the cost is low. The linear regulated power supply and switching mode power supply are the categories of power supplies. The efficiency of unregulated power supplies is 90-95% and the ripple (RMS) is between 0.5V to 5V. The regulated power supply is used in DC motors, relays, and actuators. The unregulated power supply is used in television, computers, and mobile chargers. 1). Regulated power supplies are used in __________ Add description here! Mobile chargers Measurement devices Computers All of the above Hint 2). The silicon-controlled rectifiers are __________ devices Unidirectional Bidirectional Multidirectional None of the above Hint 3). The silicon-controlled rectifier is a _______ triggered device Current Voltage Both a and b None of the above Hint 4). The controlling element of silicon-controlled rectifier is __________ Gate Collector Emitter Base Hint 5). The voltage regulator output impedance is _______ Very small High Very high None of the above Hint 6). The Zener current is maximum when the load current is ___________ Zero Infinity One None of the above Hint 7). The Zener diode made of _______ Silicon Silver Copper None of the above Hint 8). The regulated DC power supply also called ________ Linear power supply Non-linear power supply Both a and b None of the above Hint 9). ______ are the building blocks of regulated DC power supply Rectifier, DC filter Regulator Step down transformer All of the above Hint 10). The rectification is a process of converting ________ Alternating current into direct quantity Alternating voltage into direct quantity Alternating current or voltage into direct quantity None of the above Hint 11). Rectification can be done by using ______ Transformers Conductors Bridge rectifiers None of the above Hint 12). The output of the rectification is ______ Unidirectional Bidirectional Multidirectional None of the above Hint 13). The unregulated power supply used in ______ Relays Actuators Solenoids All of the above Hint 14). How many types of regulated power supplies are there? One Two Three Four Hint 15). The advantages of the traditional switching DC power supply are _____ Small size Light-weight Cost-effective All of the above Hint 16). The disadvantages of the traditional switching DC power supply are _____ Output noise and ripple voltage is high Noise current of common mode is high Both a and b None of the above Hint 17). The high-performance switching direct current power supply are ________ Small in size Light-weight Low output noise All of the above Hint 18). The advantages of linear DC power supply are __________ Output transient response is fast Output noise is low Common mode noise current is low All of the above Hint 19). The disadvantages of linear DC power supply are __________ Large size Costly Efficiency is low All of the above Hint 20). The efficiency of linear power supply is around ______ 10-20% 15-20% 30-40% 20-30% Hint 21). The switch-mode power supply is around ______ 10-20% 60-95% 30-40% 20-30% Hint 22). The output voltage of a switch-mode power supply is _________ More Less More or less Hint 23). The output voltage of linear power supply is ________ High Less Very high None of the above Hint 24). The circuits are ________ in switch-mode power supply Simple Complex Moderate None of the above Hint 25). In switch-mode power supply the regulation of voltage is done by controlling _________ Duty cycle Voltage range Both a and b None of the above Hint Regulated DC Power Supply MCQs for Exams 26). The noise and interference in switch-mode power supply is _______ More Less Very less None of the above Hint 27). The noise and interference in a linear power supply is _______ More Less Very less None of the above Hint 28). The line regulation of linear power supply is around _____ 0.02-0.05% 0.1-0.5% 2-5% 10-5% Hint 29). The input voltage range of linear power supply is around _______ ±50% ±10% ±30% ±40% Hint 30). The noise of the linear power supply is around __________ 10mv 30mv 50mv 20mv Hint 31). The transient response of linear power supply is around __________ 10µs 20µs 100µs 120µs Hint 32). The input linear filter is required in _______ SMPS Linear power supply Both a and b None of the above Hint 33). The hold-up time of linear power supply is around _______ 10ms-20ms 20ms-30ms 1ms-2ms None of the above Hint 34). The temperature of the linear power supply is around ________ 10-20 degrees 60-100 degrees 10-200 degrees 100-200 degrees Hint 35). The linear power supply used in __________ Communication Aviation Shipboard None of the above Hint 36). The switching power supply used in _______ Mobile stations Medical Laboratory None of the above Hint 37). The source of supply is _______ in DC power supplies Full wave rectifier Battery Delay All of the above Hint 38). An operational amplifier can be used as a _________ Comparator Intergartor Both a and b None of the above Hint 39). The ________ is not a Zener diode standard value 5.1v 5.6v 5.8v None of the above Hint 40). The diode is a _______ device Linear Non-linear Static Dynamic Hint 41). The rectifiers are categorized into _______ One Two Three Four Hint 42). ____________ rectifiers are full-wave rectifiers Center-tapped Bridge Both a and b None of the above Hint 43). Which transformer is used in a regulated DC power supply? Step up Step down Both a or b None of the above Hint 44). How many diodes does bridge full-wave rectifier consists? One Two Three Four Hint Read more about Full Wave Rectifier 45). The maximum rectification efficiency of half-wave rectifier is around ________ 10% 20% 30% 40% Hint 46). The maximum rectification efficiency of bridge full-wave rectifier is around ________ 10% 81.2% 30% 40% Hint 47). The maximum rectification efficiency of the center tapped full-wave rectifier is around ________ 10% 81.2% 30% 40% Hint 48). The line regulation of the switching DC power supply is _________ 0.05-0.1% 0.10-0.1% 0.15-0.1% 0.5-0.1% Hint 49). The load regulation of the switching DC power supply is _________ 0.05-0.1% 0.10-0.1% 0.15-0.1% 0.1-1.0% Hint 50). The input voltage range of the switching DC power supply is _________ ±570% ±20% ±50% ±60% Hint Regulated DC Power Supply MCQs for Interviews 51). The noise of the switching DC power supply is _________ 100mv-200mv 60mv-200mv 70mv-200mv 50mv-200mv Hint 52). The transient response of the switching DC power supply is _________ 1ms 4ms 5ms 8ms Hint 53). The hold-up time of the switching DC power supply is _________ 10-30ms 25-30ms 20-30ms 15-30ms Hint 54). The ripple factor of half-wave rectifier is ______ 100% 121% 110% 10% Hint 55). The ripple factor of the center tapped full-wave rectifier is __________ 100% 48% 110% 10% Hint 56). How many diodes does the center tapped full wave rectifier consists of? One Two Five Six Hint 57). How many diodes does half-wave rectifier consists of? One Three Six Five Hint 58). Which transformer increases the voltage? Step up Step down Both a and b None of the above Hint 59). Which filter reduces the ripple? Capacitor filter RC filter LC filter None of the above Hint 60). The switch-mode power supply categorized into __________ One Three Six Four Hint 61). __________ filter is used to obtain DC voltage with some ripple Capacitor filter RC filter LC filter None of the above Hint 62). _________ reduces the electric current Resistor Capacitor Inductor None of the above Hint 63). __________ rectifier rectifies only half cycle of AC Half-wave Full-wave Both a and b None of the above Hint 64). The voltage regulators has _______ Over-voltage protection Over-load protection Both a and b None of the above Hint Read more about Voltage Regulator 65). The Zener diodes cannot be used in __________ Mobile charging Power supply Rectification All of the above Hint 66). The switch-mode power supply has a _________ generator circuit Rectangle Sinewave Square wave None of the above Hint 67). The power supply unit is used to __________ the power to circuits Regulate Convert Transmit All of the above Hint 68). In half-wave rectifier during the positive cycle of the input signal, the diode is _______ Forward biased Reverse biased Hint 69). In half-wave rectifier the diode act as a close switch in ________ cycle operation Positive Negative Both positive and negative None of the above Hint 70). In ____________ operation in diode in half-wave rectifier acts as a open switch Positive cycle operation Negative cycle operation Both positive and negative None of the above Hint 71). In a bridge rectifier, the diode 1 and diode 2 are forward biased and the diode 3 and diode 4 are reverse biased in ________ Positive cycle operation Negative cycle operation Both positive and negative None of the above Hint 72). In a bridge rectifier, diode 1 and diode 2 are reverse biased and diode 3 and diode 4 are forward biased in ________ Positive cycle operation Negative cycle operation Both positive and negative None of the above Hint 73). The transient recovery of typical switching power supply is around _________ 100s 200s 300s 400s Hint 74). The transient recovery of typical linear power supply is around _________ 10s 20s 30s 50s Hint 75). The output ripple of the typical switching power supply is around __________ 10-100mv peak-to-peak 20-100mv peak-to-peak 30-100mv peak-to-peak 40-100mv peak-to-peak Hint Regulated DC Power Supply MCQs for Students 76). The output ripple of the typical linear power supply is around __________ 0.5-2.0mv RMS 0.1-2.0mv RMS 0-2.0mv RMS 0.2-2.0mv RMS Hint 77). ________ are the examples of filter capacitor Electrolytic Bulk Solid polymer All of the above Hint 78). ______ are the examples of AC-DC power supplies Laptop power adapter Phone charger Desktop PC power supply All of the above Hint 79). The output obtained by the rectifier is ________ Pulsating DC Pulsating AC Non-pulsating AC None of the above Hint 80). The AC component present in output voltage is called _________ Ripple Switching regulator Non-linear regulators None of the above Hint 81). The breakdown is another name for _______ diode Zener Avalanche Laser None of the above Hint 82). The reactance of an inductor is given as ___________ 2πfL πfL 4πfL 8πfL Hint 83). ___________ allows DC but it blocks AC Conductor Inductor Insulator None of the above Hint 84). The reactance of a capacitor is given as ___________ 2πfL 2πfc 4πfc 8πfc Hint 85). The capacitor reactance is infinity when the frequency is _______ Zero Infinity One None of the above Hint 86). In breakdown region ________ diode acts like battery Zener Avalanche Laser None of the above Hint 87). There are _______ main designs for DC power supplies One Two Five Six Hint 88). Which one is a switching DC power supply? PMX-A PWR-01 Both a and b None of the above Hint 89). The switching DC power supplies regulate output voltage through a process known as ________ TDM PWM FDM None of the above Hint 90). The linear power supplies are __________ Bulky Less efficient Both a and b None of the above Hint 91). How many blocks does SMPS have? One Three Five None of the above Hint 92). Which one is a linear DC power supply? PMX-A PWR-01 Both a and b None of the above Hint 93). When load current is maximum the Zener current is _______ Maximum Minimum Zero None of the above Hint 94). The Zener current is ________ when the load current is zero Maximum Minimum Zero None of the above Hint 95). The Zener regulator _________ the ripple in power supply? Increases Decreases Both a and b None of the above Hint 96). For small load current the ___________ regulators are used Zener voltage Zener current Both a and b None of the above Hint 97). Zener diode can be used as both ___________ regulator AC and DC voltage AC DC None of the above Hint Read more about Zener Diode 98). For filter circuit _________ are used Inductor Capacitor Both a and b None of the above Hint 99). The regulated power supply converts unregulated AC into __________ Regulated AC Regulated DC Unregulated AC Hint 100). The load regulation of linear power supply is around _____ 0.02-0.1% 0.1-0.5% 2-5% 10-5% Hint Time is Up! Time's up
