Voltage Regulators Question & Answers June 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 voltage Line Load Both a and b None of the above Hint 2). When input voltage varies __________ voltage regulation maintains the constant output voltage Line Load Both a and b None of the above Hint 3). ___________ are the type of linear voltage regulators Series Shunt Both a and b None of the above Hint 4). ___________ is an example of fixed positive voltage regulator IC7805 IC7905 IC7906 None of the above Hint 5). ___________ is an example for fixed negative voltage regulator IC7805 IC7905 IC7906 None of the above Hint 6). ___________ is an example for positive adjustable voltage regulator IC7805 IC7905 IC7906 LM317 Hint 7). The maximum input voltage of the LM78MXX IC range is _________ 35V 40V 45V 50V Hint 8). The maximum current of LM78MXX IC range is _________ 100mA 500mA 1mA 200mA Hint 9). Which one is a type of linear voltage regulator? Series Step-down Inverter All of the above Hint 10). How many types of voltage regulators are there? One Two Three Four Hint 11). The fixed positive voltage regulators provides voltage in the range of _________ +3 to +24V -3 to -24V +5 to +24V -5 to -24V Hint 12). The fixed negative voltage regulators provides voltage in the range of _________ +3 to +24V -3 to -24V +5 to +24V -5 to -24V Hint 13). The maximum current of LM78LXX IC range is _________ 100mA 500mA 1mA 200mA Hint 14). Which one is a type of switching voltage regulator? Step-up Step-down Inverter All of the above Hint Read more about Voltage Inverters 15). The maximum current of LM78XX IC range is _________ 100mA 500mA 1mA 200mA Hint 16). The maximum input voltage of the LM78LXX IC range is _________ 35V 40V 45V 50V Hint 17). ___________ is an example for negative adjustable voltage regulator IC7805 IC7905 LM337 LM317 Hint 18). The maximum input voltage of the LM78XX IC is _______ 35V or 40V 42V 45V 50V Hint 19). The input voltage range of an IC 7805 voltage regulator is _______ 5V-12V 7V-35V 6V-12V None of the above Hint 20). In which type of regulator does 7805 IC is used? Fixed output voltage regulator Current regulator Adjustable output regulator All of the above Hint Voltage Regulator Important MC's With Hints 21). Which IC is a fixed positive voltage regulator? LM78XX LM79XX LM2576 LM2596 Hint 22). Which IC is a fixed negative voltage regulator? LM78XX LM79XX LM2576 LM2596 Hint 23). Which IC is a fixed and adjustable switching voltage regulator? LM78XX LM2596 LM2576 Both b and c Hint 24). Which IC is a low power variable voltage regulator? LM78XX LM723 LM2576 Both b and c Hint 25). The maximum output voltage range of an IC 7805 voltage regulator is _______ 5.2V 7.5V 6.2V None of the above Hint 26). Which IC is an adjustable negative voltage regulator? LM333 LM237 LM337 All of the above Hint 27). Which IC is an adjustable positive voltage regulator? LM150 LM350 LM723 Both a and b Hint 28). The three-terminal fixed output voltage regulators are ________ Easy to use Less cost High cost and complexity to use Both a and b Hint 29). What is the standard form of AVR? Amplified Voltage Regulator b) c) d) Automatic Voltage Regulator Adjustable Voltage Regulator None of the above Hint 30). The minimum output voltage range of an IC 7805 voltage regulator is _______ 5.2V 7.5V 6.2V 4.8V Hint 31). What is the standard form of CVT? Constant Voltage Transistor Complex Voltage Transistor Constant Voltage Transformer None of the above Hint Read more about Transformer 32). The ratio of (no load output voltage-full load output voltage/full load output voltage)*100% is known as ____________ regulation Line Load Both a and b None of the above Hint 33). The output voltage and output current of LM317 adjustable positive voltage regulator is __________ 1.2 to 37V, 1.5 Amp 1.8 to 37V, 1.5 Amp 1.9to 37V, 1.5 Amp 2.0 to 37V, 1.5 Amp Hint 34). Which IC is a multi-point voltage regulator? 78XX 79XX LM723C None of the above Hint 35). Motorola’s MC1723 is a _________ regulator Fixed output voltage Adjustable output voltage Switching regulator None of the above Hint 36). How many types of IC voltage regulators are there? One Two Three Four Hint 37). Which IC is a three-pin type voltage regulator? 78XX 79XX LM723C Both a and b Hint 38). How many pins does an IC 723 voltage regulator have? 10 pins 12 pins 14 pins 8 pins Hint 39). What are the advantages of the switching regulator? Small size Higher efficiency Lightweight All of the above Hint 40). What are the advantages of the three-terminal voltage regulators? Output noise is low Less efficient Requires high current None of the above Hint Voltage Regulator MCQs for Quiz 41). What are the components used in voltage regulators? Feedback circuit Pass element control circuit Stable reference voltage All of the above Hint 42). The regulators are categorized into ________ Two Three Four Five Hint 43). What are the applications of the shunt regulator? Error amplifier Voltage monitoring Precision current limiters All of the above Hint Read more about Amplifiers 44). What are the disadvantages of the linear voltage regulators? Efficiency is high Efficiency is low Requires large space Both b and c Hint 45). The linear series voltage regulator consists of _______ Control element Reference voltage Error detector and sample circuit All of the above Hint 46). An IC 723 acts as __________ Clipper Low voltage regulator High voltage regulator Both b and c Hint 47). How much voltage does an IC 7924 provides? 5V +5V -12V -24V Hint 48). What is the minimum input voltage of the fixed IC 7805 voltage regulator? 15V 16V 7V 8V Hint 49). An IC 7824 fixed positive voltage regulator input voltage range is between ____________ 7-25V 8-25V 10.5-25V 27-38V Hint 50). The output voltage of an IC 7824 fixed positive voltage regulator is ________ 7V 8V 10.5V 24V Hint 51). The output voltage of an IC 7912 fixed positive voltage regulator is ________ -7V -8V -12V 24V Hint 52). The output voltage of the device LM337 HVH adjustable negative voltage regulator is ______ -1.2 to -37V 8 to 25V 10.5 to 25V 27 to 38V Hint 53). The maximum input voltage of the LM337LZ series adjustable negative voltage regulator is ________ -1.2 to -37V 40V 10.5 V 27 V Hint 54). How many methods are there to determine the voltage regulation? One Two Four Eight Hint 55). The indirect method to determine the voltage regulation is categorized into ___________ One Nine Six Four Hint 56). What is the standard form of ZPF? Zener Power Factor Zero Power Factor Zero Phase Factor None of the above Hint 57). What is the standard form of ASA? Amplifier Standard Association American Standard Association Automation Standard Association None of the above Hint 58). How many pins does an IC 7805 voltage regulator consist of? One Six Three Eight Hint 59). In how many conditions does the voltage regulator maintains constant output? One Two Eight Nine Hint 60). How many parameters are there to measure the regulation? One Two Five Seven Hint Voltage Regulator MCQs for Engineers 61). The ratio of change in the output voltage to the change in the input voltage is known as ______ Line regulation Load regulation Both a and b None of the above Hint 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 regulation Load regulation Both a and b None of the above Hint 63). When there is no load connected across the circuit that means _________ No load No current Resistance is infinite All of the above Hint 64). The ideal value of the load regulation should be ______ 1% 0% 2% 5% Hint 65). When there is no breakdown then the zener diode should be _______ ON OFF Hint 66). When there is a breakdown then the Zener diode should be _______ ON OFF Hint 67). The voltage across the Zener diode _________ Less than or equal to the Zener voltage Greater than or equal to the Zener voltage Equal to the Zener voltage None of the above Hint 68). Zener diode is widely used in ________ Voltage regulations Rectifiers Clippers None of the above Hint 69). In the case of the series voltage regulator, the controlling element is in _______ Series with load Parallel with load Hint 70). In switching regulator _________ acts as switch Diode Rectifier Transistor Relays Hint 71). The frequency range of the pulse generator is ______ 10KHz 15KHz 20KHz 25KHz Hint 72). What are the advantages of transistor series voltage regulator? Efficiency is good Output impedance is low Ripple content is low All of the above Hint 73). The isolated converters are _________ types One Two Five Eight Hint 74). The buck converter is an another name of __________ voltage regulator Step-up Step-down Adjustable None of the above Hint 75). The boost converter is the another name of __________ voltage regulator Step-up Step-down Adjustable None of the above Hint 76). ____________ are the limitations of the transistor series voltage regulator Power dissipation is low Power dissipation is high Less efficiency Both b and c Hint 77). What is the standard form of LPS? Load Power Supply Line Power Supply Linear Power Supply None of the above Hint 78). What are the advantages of the linear power supply? Noise is low Ripple is low Circuitry is simple All of the above Hint 79). What is the standard form of SMPS? Switch Mode Power Supply Switch Main Power Supply Simple Mode Power Supply None of the above Hint 80). What are the disadvantages of SMPS? Noise is present Circuitry is complex Produces electromagnetic interference All of the above Hint Voltage Regulator MCQs for Interviews 81). What are the advantages of SMPS? Heat generation is less Power wastage is less Both a and b None of the above Hint 82). What are the types of SMPS? DC to DC converter Flyback and forward converter AC to DC converter All of the above Hint 83). Which one is not an active component? Diodes Transistors Transformers Resistors Hint Read more about Transformers 84). Which one is not a passive component? Diodes Capacitors Inductors Resistors Hint 85). The signals are categorized into __________ types One Two Five Four Hint 86). The waveshaping are categorized into? One Two Six Four Hint 87). The filters are categorized into? Five Two Nine Four Hint 88). ___________ is a type of DC voltage regulator Zener diode Transistor series Glow tube All of the above Hint 89). How many circuits does the regulated power supply consist of? Five Eight Three Nine Hint 90). Which IC is a three-pin voltage regulator? Fixed Adjustable Both a and b None of the above Hint 91). The shunt regulator efficiency is _________ compared to the series regulator More Less Hint 92). The efficiency of the switching regulator is __________ 60% ≤90% >90% None of the above Hint 93). What are the features of IC 723? It provides adjustable voltage output in the range of 2-37V It operates in both positive & negative supply It provides internal power dissipation of 800mW All of the above Hint 94). The maximum amplifier input voltage of an absolute maximum rating of an IC 723 is ______ 8.5V 9.5V 10.5V None of the above Hint 95). Internal power dissipation value is _________ of an absolute maximum rating of an IC 723 8.5mV 660mV 105mV None of the above Hint 96). The voltage in LM317 voltage regulator can be set by using __________ Two external resistors Three external resistors Four external resistors None of the above Hint 97). The output voltage of an IC 7912 voltage regulator is ________ 8.5V 66V -12V None of the above Hint 98). The output voltage of LM317 voltage regulator can be adjusted to ________ 1.2V to 37 V 1.4V to 37 V 1.6V to 37 V None of the above Hint 99). LM317 voltage regulator suppliess more than ________ 1.0Amp 1.2Amp 1.5Amp None of the above Hint 100). An IC LM317 is a ___________ voltage regulator Adjustable three-terminal positive Adjustable three-terminal negative Adjustable two-terminal positive None of the above Hint Time is Up! Time's up
